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Operator
Greetings. Welcome to Similarweb's second-quarter fiscal 2021 earnings conference call. (Operator Instructions). Please note today's conference is being recorded. With us today are Or Offer, Co-Founder and CEO, and Jason Schwartz, CFO. At this time I will turn the conference over to Annie Rosenberg with Investor Relations. Annie, you may now begin.
Annie Rosenberg - IR
Thank you, operator. During this call we will make forward-looking statements related to our business, including statements related to the expected performance of our business, future financial results, strategy, the potential impact of the COVID-19 pandemic and associated global economic uncertainty, long-term growth and overall future prospects. These statements are subject to known and unknown risks, uncertainties and assumptions that could cause actual results to differ materially from those projected or implied during the call.
Actual results and the timing of certain events may differ materially from the results or timing predicted or implied by such forward-looking statements. And reported results should not be considered as an indication of future performance. Please review our filings with the SEC, including our final prospectus and the section entitled Risk Factors therein, filed with the SEC on May 12, 2021, for a discussion of the factors that could cause our results to differ.
Also note that the forward-looking statements on this call are based on information available as of today's date. We disclaim any obligation to update any forward-looking statements except as required by law. As a reminder, certain financial measures we use in this presentation and on our call today are expressed on a non-GAAP basis. We use these non-GAAP financial measures internally to facilitate analysis of our financial and business trends and for internal planning and forecasting purposes.
We believe these non-GAAP financial measures, when taken collectively, may be helpful to investors because they provide consistency and comparability with past financial performance by excluding certain items that may not be indicative of our business, results of operations or outlook. However, non-GAAP financial measures have limitation as an analytical tool and are presented for supplemental informational purposes only. They should not be considered in isolation from or as a substitute for financial information prepared in accordance with GAAP.
A reconciliation between these GAAP and non-GAAP financial measures is included at the conclusion of our earnings press release which can be found on our Investor Relations website at ir.similarweb.com. With that I will turn the call over to Or Offer, CEO of Similarweb.
Or Offer - Co-Founder, CEO & Director
Thank you, Annie, and thank you all for joining us here today for our Q2 earnings call, which is also our first as a public company. It is a real privilege to be here with all of you on the call today. Our recent IPO was an exciting milestone for our employees, customers, investors and partners, and I want to thank them for their confidence in us over the years.
I also would like to welcome our new investors to the Similarweb family. During today's call Jason, our CFO, and I will provide details of our Q2 results as well as provide Q3 and full-year guidance for 2021. I will start today by covering highlights of our financial performance. Q2 2021 was a record quarter for us and I'm pleased to report that our revenue increased 49% year-over-year to $32.5 million.
We are also very happy that we were able to accelerate our growth versus Q2 2020, continuing our trend of accelerating growth. We also took advantage of strong demand for our solution as companies across the globe focused on digital transformation.
In Q2 we also improved our gross margin by more than 250 basis points year-over-year to 78.5%, highlighting the scalability of our platform. Our free cash flow was negative $3.3 million, reflecting the strong fundamentals of our business even as we expanded our operations. I want to expand further on those results and also touch on a few key trends that we see as existing for our business.
But first, since many of you are new to Similarweb, I wanted to spend a few minutes talking about our business and market opportunity and how we deliver our offering of disrupting traditional markets and helping businesses compete and win in the digital world.
Similarweb was born out of my own personal pain. I was trying to do some market research for my off-line business many years ago, but no matter what I searched for I couldn't find anyone with the insight I needed. I saw a market opportunity and 14 years later Similarweb is a leader in market intelligence for the digital world.
Today our customers are some of the largest and best brands, leaders like Walmart, Google, Publicis, Merck, DHL, CNN and many more. A lot has changed since we wrote our first lines of code. Digital has become a threshold way to communicate, transact and deliver products and services. It is an important growth driver and strategic focus for most businesses today.
At the same time, it has made every market much, much more competitive. In this environment businesses have no visibility into the online activity of their customers, prospects, partners and competition. In reality they are flying blind.
Similarweb cuts through the lack of visibility delivering a comprehensive view of the digital world to our customers, providing them with market data and insights to help them win in the digital world, the data and, more importantly, the actionable insights that we provide empowers our customers to be more competitive in the markets. We call this digital intelligence.
Digital intelligence is embedded in critical business processes and gives organizations the means to understand and gain insight from all relevant digital activity. It creates a powerful competitive advantage. It empowers companies to make better business decisions, increase their confidence and help them win the market. Sometimes it can mean the difference between business success and failure.
To paint a picture of how digital intelligence can make this kind of impact, I want to share a conversation we recently had with one of our customers, the head of digital marketing at Staysure, one of the top travel insurance companies in the UK. When COVID hit their entire business was at risk of failure. Similarweb helped them to adapt to the new reality. With Similarweb they were able to quickly identify which markets recovered the fastest, form initial lockdown and focus on those opportunities.
They also use Similarweb to identify new market segments, for example, younger travelers looking to ensure against COVID-19 risk. They were able to create new products designed for this emerging segment and use Similarweb insights to gain a strategy to reach the new audience. According to the company, and I quote, Similarweb kept us in business.
When times are challenging it's all about understanding what the competition is doing, where we fit in the market and what's going on in the market overall. It's notable that in Q2 we completed an upsell deal with Staysure, increasing their ARR value of their contract by over 30%.
This example isn't unique. Now more than ever companies need visibility into what's happening in their digital ecosystem if they want to survive and win. Digital transformation is accelerating, but all that investment cannot be optimized without comprehensive, accurate and timely market data that integrate into the corporate workflow. This makes digital intelligence a mission-critical.
We believe this massive opportunity -- and we estimate that our total addressable market today is over $34 billion. Delivering this kind of impactful digital intelligence isn't an easy task to do. It is extremely difficult to gather massive quantities of digital signals across the Internet, each signal providing only small perspective of what's going on in the digital world. And it's even harder to use those signals to build the models that are designed to measure and predict how the digital world behaves.
This is what we do. Just think every day we need to estimate traffic for tens of millions of websites and apps, in over 190 countries in over 200 industries. And we need to do it really well, because we know that leading companies and investors around the world will make critical business decisions based on the insights we provide in our platform.
We have been working on solving this problem and creating this technology for over 10 years. Over time, we invested significant resources and funds in our data assets and acquisition, and building a very strong competitive moat around our technology. To achieve that we have built a unique R&D organization that operates an innovative first based culture.
Every month this team delivers hundreds of innovative data and feature enhancements that improve our customer retention and increase average customer spend. We have continued to expand this team, which now includes nearly 250 top-notch developers, PhDs, data scientists and big data engineers and we're very proud of their work.
We also built a very efficient sales and marketing organization to approach and attack this very large market opportunity. This starts by attracting and engaging prospects that are widely used free tools. On our website, and through a popular browser extension, we provide free access to a broad range of basic capabilities as well as opportunities to explore our paid offering.
The cost-effective leads from this freemium inbound motion efficiently converted to pipeline opportunities for our sales team to pursue. We complement this with an outbound sales motion focused on developing new opportunities with larger target accounts. After successfully landing a new customer we also have a team of client success analysts who help our customers realize more value from our platform, resulting in more strategic relationships and expanding revenues. This land and expand motion is working very successfully for us.
I want to turn now and discuss our Q2 performance. I would like to mention a couple of highlights and how they illustrate several of our business strategies, specifically around our land and expand sales motion, creating of channels of indirect growth and the introduction of new products and data sets. Let's start with our land and expand.
Over the last 12 months, we accelerate new logo acquisition landing over 600 new customers and crossing the 3,000 customer logo threshold in Q2. We are building on this strong new logo acquisition by refining our motion around customer retention and growth.
As an example of this, in Q2 we completed one of our largest builds in Similarweb history with a major e-commerce company. This customer began a journey with us in 2016 starting with one use case and around 50,000 in annual ARR. Today, they use Similarweb across 25 teams globally with around 1,500 users representing over $3.5 million in ARR.
Our Q2 upsell was a seven-figure ARR upsell with a multiyear commitment, included the addition of hundreds of new users, as well as an upsell of premium product features and extended data sets. It's also highlighting our land and expand motion in operation, where we started small and over time we were able to expand traditional use case department and geographies within the customer.
This land and expand motion is very significant growth among our largest and most strategic customer segments. Those companies where we are generating more than 100,000 in ARR. We grew the number of those accounts by 52% year-over-year, and nearly 60% of this growth came from existing customers and how our ARR expanded to more than $100,000.
Overall, our ability to retain customers and expand ARR is reflected in the highest level of NRR that we have ever recorded. NRR strongly improved from 101% in the end of 2020 to 106% at the end of Q2. In that critical customer segment of accounts with over $100,000 in ARR, we improved NRR to 118%, up from 113% at the close of 2020.
Beyond our direct sales motion, we continue to develop indirect sources of demand. First we recently announced the availability of Similarweb digital insights on the AWS Data Exchange. With the AWS Data Exchange, companies ranging from CPGs to hedge funds can reach the big data analysis with digital marketing intelligence including website traffic, keywords and retail transaction.
While this did not have a material contribution to Q2 results, I believe this partnership will broaden our customer reach and further help customers integrate Similarweb into their workflows. And in Q2, we also introduced an affiliate marketing program and a partner selling program, launching two new indirect channels for lead and opportunity creation.
Also, in Q2 we launched a new solution, our Shopper Intelligence, which is targeted at the rapidly growing e-commerce segment. Shopper Intelligence analyzes consumer shopping behavior across desktop and mobile and provides a comprehensive solution to understanding the digital customer journey and what consumers are buying online.
Our goal is that Shopper Intelligence would analyze and deliver insights about digital consumer behavior across both e-commerce marketplaces and first priority shopping websites. We are off to a strong start with a solution. We have already closed new businesses in a diverse set of industries, not just in primary CPG audience, but also in retail, pharma, technology and private equity.
I'm looking forward to giving you more details on those wins in the future. We believe that Shopper Intelligence is an innovative product with features that are unique in the market. And I'm super excited about it and I think we have a huge opportunity in front of us with this new offering.
In Q2, we also made significant addition to the scope of data and insight available through the Similarweb platform. We completed the acquisition of the assets of SimilarTech, which we believe was one of the best providers of technographic data in the market. The acquisition enables us to more completely integrate SimilarTech's data into our solution, an opportunity to leverage their data to build some exciting new features as well.
Separately, we recently announced a significant advancement in our capabilities in our Keyword Generator, which enables search professionals to find and explore keywords relevant to expanding their business. The keyword generator now includes support for YouTube, the world's second largest search engine, as well as Amazon where 60% of the product searches currently originate. Those enhancements expand our coverage by over 800 million keywords, extending our breadth of coverage and keyword volume accuracy.
Beyond these efforts we continue to invest in our organizational growth and development. We continue to scale our organization to support our strong growth. Employee headcount in Q2 grew nearly 60% year-over-year. We continued our international expansion opening up a new direct sales presence and office in Germany.
Recently we also announced a new office in Reston, Virginia where we will focus on hiring sales and marketing roles and where we expect we will be able to tap into strong local talent in the areas of digital measurement and market research.
Finally, I'm very excited to announce that last week we closed on a new headquarters facility in the Tel Aviv area. This new building will accommodate our rapid growth and we will be able to fully design the space to meet our needs for our growing team. Our new Similarweb headquarters is located in the center of Tel Aviv metropolitan, and I expect that when completed, it will be a significant attraction that will enable us to continue to recruit top talent here in Israel.
Finally, as we said during the IPO, we will leverage our momentum and continue to pursue both organic and inorganic growth strategies. We will invest in our sales and marketing efforts to accelerate customer acquisition because of the high ROI we get on those investments and the big market opportunity we see.
We will take advantage of our strong financial position to opportunistically target and acquire companies in order to improve and expand our data, use cases and addressable markets. We are operating in a fragmented market and we believe we have an opportunity to be the consolidator.
Wrapping up, I'm very proud of the company we have built. We have followed our 2020 performance with strong and accelerating growth in the first half of 2021. We have outstanding leadership and our team is smart, bold, fast, talented and experienced. We have a strong balance sheet. Our solutions are market-leading and providing timely and comprehensive data and insights that we believe our customers cannot get anywhere else.
Every day thousands of businesses rely on Similarweb's solutions to make mission-critical decisions. We believe we are recognized as a standard measure of the digital world. Our insights are frequently referenced publicly by CEOs, major publications and respected research firms. Our platform has become a required experience for job opportunities and a notable skill that users highlight on LinkedIn.
We are confident in our growth strategy and we have a track record of strong operational execution. It's still early in our journey and we believe we are in a great position to capitalize on and capture an increasing share of a very large market. And as I like to say, we are just getting started. With that I would like to turn the call over to Jason Schwartz, our CFO. Jason?
Jason Schwartz - CFO
Thank you, Or. I'm going to start with an overview of our financial model and then I will review our financial results for the quarter and wrap up with our guidance for Q3 and full year 2021.
Our financial model is built on the delivery of strong and predictable revenue growth, substantially all of which is generated from SaaS subscriptions. We deliver a high net dollar-based retention rate, or NRR, and also maintain high gross margins and unit economics that drive cash efficiency.
In Q2 we delivered record revenue of $32.5 million, reflecting 48.5% year-over-year growth. We increase our total number of customers to 3,068, up 24% from 2,479 in Q2 last year. This includes, as Or mentioned, a strong increase in our $100,000 or more ARR customers, which grew by 52% from 145 in Q2 2020 to 220 in Q2 2021.
Most of these customers began initially as small customers and have expanded through our successful land and expand motion. Today these customers comprise 49% of our overall recurring revenue base. Our revenue and customer base is highly diversified and no single customer amounts to more than 5% of revenue.
In discussing the remainder of the income statement, please note that, unless otherwise stated, all references to our expenses and operating results are on a non-GAAP basis and are reconciled to the GAAP results in the earnings press release that was issued just before this call.
Our gross profit totaled $25.6 million in the quarter, representing a gross margin of 78.6% versus 76% in Q2 2020. This margin improvement reflects the significant operating leverage we have been able to realize in our fixed SaaS infrastructure and data costs.
Operating expenses grew to $36.3 million in Q2 up from $19.1 million in Q2 2020, largely reflecting the investment in personnel across the business from product and R&D, sales and marketing and our G&A team to support our business growth. We see a large TAM and opportunity ahead of us and will continue to invest in personnel and initiatives that help us capture more market share.
The specific components of our operating expenses were: research and development, $8.3 million versus $4.7 million in Q2 2020. This excludes $696,000 of retention payments relating to the acquisition of SimilarTech during the quarter. We anticipate an additional $350,000 in Q3. Sales and marketing, $21.4 million versus $11.8 million in Q2 2020; general and administrative, $6.6 million versus $2.6 million in Q2 2020. This excludes $1.2 million of nonrecurring expenses related to our initial public offering.
As a result our non-GAAP operating loss in the quarter totaled $10.8 million increasing from $2.5 million in Q2 2020. Free cash flow for the quarter was negative $3.3 million compared to $1.5 million in Q2 2020.
In May we successfully completed our initial public offering of our ordinary shares raising net proceeds of 150.7 million after deducting underwriting fees and commissions and related offering costs. During the quarter, we also repaid all outstanding amounts under our credit facility, such that as of the end of the quarter we have no outstanding debt. As a result, we have a strong cash position that totaled $177 million of unrestricted cash balances as of June 30, 2021.
We have additional capacity available to us under our $75 million credit facility with Silicon Valley Bank. As such, we believe that we have sufficient liquidity to successfully execute our business growth plans.
As Or mentioned, last week we signed an office lease agreement for our new Israel headquarters. We anticipate investing $8 million to $10 million in leasehold improvements over the next four quarters in advance of our anticipated move-in date in Q2 2022, which will be amortized over the 10-year term of the lease.
We are introducing guidance for both Q3 and the full year 2021. For Q3 2021 revenue is expected to be in the range of $32.8 million to $33.2 million. Non-GAAP operating loss is expected to be in the range of $14.5 million to $14.9 million. Full-year 2021 revenue is expected to be in the range of $129 million to $130 million. Non-GAAP operating loss for full-year 2021 is expected to be in the range of $49 million to $50 million. I'll now hand the call back over to Or for his closing remarks.
Or Offer - Co-Founder, CEO & Director
Thank you, Jason. I would like to close by thinking my leadership team and our employees around the world for working hard to deliver a very successful first half of the year. Our IPO was a milestone for us as we continue to grow, and I am pleased to welcome our many new investors to the Similarweb family. With that, operator, please open the call up for questions. Thank you.
Operator
(Operator Instructions). Sterling Auty, JPMorgan.
Sterling Auty - Analyst
So, I wanted to start with a question around the AWS marketplace partnership and deal. Can you help us understand, does this make it easier for customers to access the data and monetize? Does it just change where they are getting the data from? Or does it actually add incremental reach to new customers that perhaps you weren't getting to before?
Or Offer - Co-Founder, CEO & Director
I will try to answer this question. So, I think the quick answer is yes to all of the above. It will increase us -- the way to approach to many more customers than before that all operate on the AWS platform and buying that down to the data marketplace. So, we do expect to get more customers. It will give an easy way for them not only to access the data but another layer of server to server, so they need to get the API, API key.
It's more easy to get them access [of that] and also charge for, so trying the data, because the data is already there and if they have an AWS account it's much more easy for them to buy, use, try it and also charge because they already connect to the Amazon invoice system.
And also, Amazon is putting [rather] incentivize on their -- for those customers and to give them free credits to try many data sets on the data marketplace. So, we're also going to leverage this momentum of Amazon themselves pushing their customers to try and buy data assets there.
Sterling Auty - Analyst
Great. And then one follow-up. With the improvement in the net dollar retention, can you talk about the number of different ways that you can expand more users, more data, more geographies? Which one of those really stood out the most in the quarter in terms of driving that dollar net retention?
Or Offer - Co-Founder, CEO & Director
So, I don't have the exact answer, but I'll tell you what I feel that is driving really great expansion. One is the cross-selling of our offering and I talked a little bit about our Shopper Intelligence. So, we saw great success there of people buying one more solution from us.
So, I think buying more solutions is a great driver, but I also saw a great deal of people buying more users or other add-ons or integrating APIs. So, I think it is all across, but my feeling that what is strong now this quarter was the -- more solutions we were able to sell in, introduce to our customers.
Sterling Auty - Analyst
Great. Thanks, guys, and welcome to the public markets.
Operator
Drew Foster, Citigroup.
Drew Foster - Analyst
Jason, for the past six quarters or so your top line has been growing directionally in line with your sales and marketing spend. This quarter it was up another 30 points sequentially relative to Q1, so you are clearly accelerating that. To the extent that sales and marketing is a leading indicator for your top line, like at a high level how should we think about the pace and magnitude of investments within that envelope over the next six quarters?
And then if you could just remind us of the breakdown of how much of that incremental spend there is marketing and advertising where you might get a quicker return on those dollars? And how much is related to adding incremental salespeople and sales infrastructure where the return on those investments is a bit more protracted?
Jason Schwartz - CFO
Hey, Drew. Thanks for the question. So, what we see right now is a huge TAM and opportunity ahead of us. And as a result of that we are continuing to invest to capture a larger share of that market that we see. And so, we have accelerated hiring, I think you may have seen that in the press release that headcount has grown across the business. But our approach is really to invest in a responsible way, balancing that growth and efficiency. And so, that's what we are going to continue to do, and we do think that's an indication of further growth down the road.
As far as the split, we don't break down the split between marketing dollars versus headcount dollars, but what we do say is about 60% of our marketing sales spend goes to new customer acquisition and about 40% of it is spent on customer retention and expansion.
Drew Foster - Analyst
That's really helpful. Thanks. And then you had strong gross margin improvement; I think you even called it out at the top of your press release. So, could you just maybe unpack what's driving that and where you think you could drive those to over time?
Jason Schwartz - CFO
Yes, sure. A lot of our cost of sales is comprised of fixed costs in the infrastructure, the typical kind of stuff that you have, hosting and support. We actually host at AWS, as well as all of the investment that we make, both internal costs and external costs, in our data assets. And so -- which is really a fixed cost for us because it's the same amount of data that we need, whether we are running or providing the service to 5,500 or 5,000 customers.
And so, there's a natural leverage we get on those fixed costs and that's the improvement that you've see not only this quarter, but over the trend over time over the last two or three years. We think that we're comfortable with the guidance that we've given. And I was saying the same levels for the near-term and then potentially going forward -- as we think about guidance going forward we'll, of course, update you.
Operator
Bhavan Suri, William Blair.
Bhavan Suri - Analyst
Congrats and, echoing Sterling, welcome to being a public company. Nice job. I guess I just want to touch quickly first on the new customer strength. I would love to understand what's driving the momentum there. You've obviously increased sales and marketing, you've got partners. But I guess as you look at that, are these customers replacing another vendor or is this web intelligence program for the first time?
Or Offer - Co-Founder, CEO & Director
It's a good question. I think that the majority of the deals that we are at, it's basically only us, we are not replacing. It is mostly a greenfield opportunity.
Bhavan Suri - Analyst
Got you, got you, got you. And then you relaunched the platform in 2019 with these five key use cases. Have you seen any change in how customers are adopting solutions? Are they changing where they start? And are they building different data strategies once they've implemented a couple solutions? How should we think about that progress of the customer and their strategy from when they adopt to when they change? Thank you.
Or Offer - Co-Founder, CEO & Director
It's a good question. I do see that the more we develop our offering and bringing in new solutions into the market, we kind of unlocked a new strategy for our customers. Once we kind of introduce our solution better, and I saw it also in our CPG customers now that we introduced shorter solutions to them and they are getting this all new data. And then they understand they can drive a new strategy.
And one example also on our investor vertical, when we come with more shop offering and then it's kind of giving them a whole new perspective about how to think and develop strategy around data and insight like market data and insights going forward. So, I do see that, I do see that it will come. And a lot of the things we present are new and innovative even to the customer. And they understand the power that digital intelligence has and how they can use it to drive more strategic decisions across their business.
Bhavan Suri - Analyst
Got you, got you. Thanks for the color and nice job, guys. Thanks for taking my questions.
Operator
Brent Thill, Jefferies.
Unidentified Analyst
This is John (inaudible) for Brent Thill. I had two questions. One, out of the five major solutions you have, any particular strength to highlight among the five? And maybe you could shed some light also on the relative contribution?
And then second, this is probably for Jason, just wanted to see if you have any comments on the linearity during the quarter, the trends by month, any particular variations to note including quarter to date. Thanks very much.
Or Offer - Co-Founder, CEO & Director
So, I will start answering the solution and then Jason can talk about the trend. So, all of the solutions are growing very nicely and we're very happy with the overall growth. We saw great success with the [new two offering] to investors and the shoppers of CPGs are accelerating nicely.
But I think still the majority of our business is for our core solution that we start for resale solution and our marketing solution that historically a lot of our customers used to buy together. And all of them are growing very nicely and we're putting a lot of efforts to develop them and improve the offering. And Jason, do you want to answer the trend?
Jason Schwartz - CFO
Yes, sure. Within the quarter -- there's some variability from quarter to quarter. But in general, because we run on an ARR model, we've got good visibility and predictability into the revenue trends as we start the quarter.
Unidentified Analyst
Great. Maybe just a little bit on that. Was there anything that you noticed in terms of customer activity as opposed to revenue trend, ups and downs, variation? And that will be it for me. Thank you.
Jason Schwartz - CFO
Not material. I think we see a lot of customer activity and a lot of customer demand throughout the quarter and we are pleased with that continued motion.
Operator
Raimo Lenschow, Barclays.
Unidentified Analyst
Hi, this is Sheldon on for Raimo. Congrats on the IPO and thanks for taking my questions. Interested in the enhancements to the keyword generator tool. Can you help me understand how differentiated the new capabilities are compared to competitor solutions and the existing Google capabilities? And additionally, on the YouTube SEO, it seems like we're still in the early innings there. Can you provide any color on the opportunity? Thank you.
Or Offer - Co-Founder, CEO & Director
Yes, so thank you for the question. I will answer that. And so, I think that this new enhancement that we give to our keyword generator is our show that we can bring very unique data assets to other competitors in the market with our unique approach to provide insights. And we know that today search is evolving and YouTube is already the second biggest search engine out there, and Amazon is the biggest search engine for e-commerce, for shopping activity.
And we recognize that our customers want to also understand the trends there and to develop their own search strategies. So, we realize that we can be innovative and [give] very high quality results around our keyword generator. And we're very happy with the data that you will see [we put out] and really big coverage with almost 800 million keywords for you to check there. And I [do] think these motions will bring a lot of new ideas and also new strategies to our customers to go after and acquire more traffic.
Operator
Jason Helfstein, Oppenheimer.
Patrick Josephs - Analyst
Hey, guys. This is [Patrick Josephs] on for Jason. Thanks for taking our questions and congrats on the strong start out of the gate. I just wanted to dive a little bit deeper into the record consolidated NRR metrics. Specifically where there are deals that leaked into the second quarter that couldn't be closed during the pandemic? Or is it just broadly a shift in client behavior which is just driving more spend at Similarweb?
Also, I know you guys aren't guiding to NRR metrics, but should we expect NRR greater of 105% going forward -- on a consolidated basis? Thanks.
Or Offer - Co-Founder, CEO & Director
So, I will try to answer it from my side and Jason can add his opinion. Our NRR growth over the past many quarters is -- it's a lot of hard work we did historically and now we start collecting the fruits. A lot of improvement in our data, in our platform, in our sales approach, in pricing and packaging, our relationships built with our customers, introducing of new offering and adding more ROI and value to our customers.
And this is why we are seeing a great result of NRR keeps growing for the many quarters. And this is why they also spend more money with us. And Jason, do you want to answer maybe from your side?
Jason Schwartz - CFO
I think, Or, I agree with you on that. This is the result of a lot of hard work, and across all customer segments we saw a strengthening both on retention and upsell, which is what driving that NRR metric.
Patrick Josephs - Analyst
Okay, great. Thanks. And just a follow-up question related to the app measurement product. Could you give us an update on the development of the app measurement product and whether there been any delays given the iOS update? Thanks.
Or Offer - Co-Founder, CEO & Director
Ad or app?
Patrick Josephs - Analyst
Sorry, the app measurement product.
Or Offer - Co-Founder, CEO & Director
So, with this deal we decided to double down on our app offering and provide more marketing sight around the app ecosystem. And there's a lot of great development there. And they're going to introduce a lot of development to the [unread] data in the coming months and hopefully also introduce a lot of improvement to the IOS data by the end of the year. And so, a lot of great improvement coming in the next few quarters around this area. So, we are doubling down and putting more effort to scale and reach in our app offering.
Operator
Pat Walravens, JMP Group.
Pat Walravens - Analyst
Great, thank you and congratulations you guys. So, my first one is if you look at this, it's a great win expansion with the e-commerce company to $3.5 million ARR. So, my first question is how much more room is there at a company like that? At $3.5 million, are you done or can it keep getting bigger?
Or Offer - Co-Founder, CEO & Director
This is a great question because I just had a great talk with my team, and I told them the target -- this customer will be our first $10 million customer. This is what I hope and think, so there is much room to grow there.
Pat Walravens - Analyst
Okay, great. That's what I was hoping. And then how many other ones are there where -- and, Jason, I don't know if you've disclosed this -- but have you told us how many you have that are north of $1 million in ARR? And if not that, just what does the pipeline look like for other customers that can be north of $1 million in ARR?
Or Offer - Co-Founder, CEO & Director
So, we are not reporting. I will start, but to answer and then Jason can (inaudible). We are not reporting right now how many -- how much seven-figure customers we have. But we do see starting to increase this sector of customers. And as I talked and presented in the roadshow, we have a big part of the Fortune 500 already as our customers. And I think most of them need to pay us seven-figures down the road and hopefully we will get there. Jason, do you want to add on that?
Jason Schwartz - CFO
Yes, as Or said, today our focus and the numbers that we talk about are that strategic customer group that are customers who spend more than $100,000 with us. And what we've seen -- we saw that 52% growth year-over-year this quarter in that cohort of customers. Today that makes up about 49% of our ARR.
We see over time that the same motion where we're seeing customers starting as smaller customers and growing into and expanding from -- in a single solution or, as Or talked about, the multi-solution getting up to multi-hundred thousand dollars, and driving that lifetime value we think over time we can get a number of customers to be those seven-digit accounts.
Pat Walravens - Analyst
Great. And then last one for me, obviously you're not guiding to the out years. But, Jason, how should we think about what you aspire to in terms of longer-term revenue growth? What's the plan that you are building internally in terms of your hiring quotas and the products you're going to bring to market and putting all that together? How fast do you think this Company is growing over the longer term?
Jason Schwartz - CFO
It's a great question, Pat. And like we said, we see a huge TAM ahead of us. And we've also looked at the performance and how we've shown that we know how to both grow and do it in a responsible and efficient way. And so, to the extent that we can continue to do that we will continue to invest smartly to balance that growth in efficiency. But we really would look forward to leaning in and capturing a larger share of that market that we see.
Pat Walravens - Analyst
Okay, that's it for me. Thank you.
Operator
Thank you. At this time we have reached the end of the question-and-answer session. I will now turn the call over to management for closing remarks.
Or Offer - Co-Founder, CEO & Director
Thank you, everyone. We're really excited to be here and answering your questions. It's our first earnings call out of many to come and we hope to continue to deliver and make our investors happy. Thank you and let's hope for an amazing year. Thank you for your questions. Bye.
Operator
Thank you. This concludes today's conference. You may disconnect your lines at this time. Thank you for your participation.