Companies Using FullStory

My job is turning detection data into prospect lists, so I read a page like this one looking for the filter that separates buyers from noise. FullStory has the cleanest one in its category. As of our August 2026 crawl we verify 26,002 active domains and matched 10,277 of them to a company record, and three numbers in that matched set point the same way: Software Development is the leading vertical at 9.97%, React runs on 45.34% of the base, and the United States accounts for 5,802 of the matched domains. Developer-facing, single-page application, American. Almost everything below follows from that.

1. What the long series can and cannot tell you

The chart above shows our current crawl only: 20,951 domains in June 2026, 23,839 in July and 26,002 in August. We hold readings back to December 2014, the year FullStory was founded, and they run higher than our current ones. I am not going to draw a trend line through the two together. Our earlier coverage read higher than our current crawl does, and two things sit between the two readings: the set of domains we crawl turns over every month, with dead sites dropping out and newly discovered ones coming in, and the signals we detect FullStory with have changed over the same period. I did test the older figure rather than assume it. I took the enterprise names we had previously attributed to FullStory and re-checked each one, and only a handful are still detected. Of the rest, almost all sit on domains we do crawl today, where we find other technologies but not FullStory, which says those older attributions were never well supported rather than that those companies left. That result is not clean enough to support a story in either direction, so I am not going to tell one. Read the level.

"A count you cannot reproduce is not a measurement, it is a memory. When the old number and the new number disagree and the audit comes back inconclusive, publish the one you can reproduce and say so." - David Thomson, CTO at TechnologyChecker.io

Sales Signal: Size the FullStory account base at 26,002 domains and do not build a growth story on top of it. The volume in this category is going to free tools, so the live question inside any FullStory account is renewal justification, not category education.

2. Customer profile

55.38% of the 9,938 domains where we know headcount sit at 1-10 employees, and 78.3% at 50 or fewer. That is what a domain count does rather than what FullStory sells: a two-person agency and Target each get one row. The useful cut is the other end. 1,051 domains belong to companies above 200 staff and 90 to companies of 10,001 or more, and those are the names you recognise: Target, Lowe's, Hewlett Packard Enterprise, Netflix, Intuit, Autodesk, Itau Unibanco, Qantas, Woolworths, CarMax. On company age, 46.41% were founded in the 2010s and 23.18% in the 2020s, so roughly seven in ten of the matched base are digital-native.

Sales Signal: Filter this list above 200 employees and you get about 1,051 domains with a budget profile that matches the product. Below that line, treat the base as agencies, trial accounts, and implementation partners, which is a different motion entirely.

3. Industry and geographic concentration

This is where FullStory separates itself from the rest of the category. Software Development leads at 9.97%, more than twice the share the leading vertical takes on either Microsoft Clarity or Hotjar, where nothing clears 5%. Technology, Information and Internet follows at 6.28%, Retail at 5.3%, Financial Services at 4.78%, and IT Services at 4.26%. Software, internet, and IT services together are 1,927 of the 9,398 records where we know the industry.

Geography is more lopsided still. The United States accounts for 5,802 of the 10,277 matched domains, more than the other fourteen countries in our table combined. The United Kingdom is second at 719, Australia third at 485, Canada fourth at 446. FullStory is the most US-concentrated tool in this category by a wide margin, and the European tail is thin: France 162, Germany 107, Spain 85, the Netherlands 65.

Sales Signal: Two filters beat any vertical playbook here. US plus software or internet gets you the core base. US plus retail or financial services above 200 staff gets you the enterprise accounts, which is where Target, Lowe's, Truist, and Itau Unibanco sit.

4. Migration patterns

We have only watched FullStory's corridors since March 2026, so this is a short window and the numbers are small. Every corridor runs against it: 356 domains dropped FullStory for Microsoft Clarity against 269 the other way, 166 left for Hotjar against 137 arriving, 84 went to Crazy Egg against 30, and 20 to Contentsquare with none returning. That is 626 out against 436 in. Hotjar and Contentsquare belong to the same company, so read those two as one corridor of 186 out and 137 in.

I would not over-read any of it. Ninety days covers nearly the whole observation window, which is why the 90-day and all-time columns are almost identical, and FullStory's tag is the least consistent in this category: on 54.5% of the domains where we have ever detected it we saw it exactly once, against roughly three in ten for Clarity and Hotjar. Some share of these departures is a detection gap rather than a cancellation. The direction is real, the magnitudes are a floor.

"When a free tool and a paid tool sit in the same category, the paid one loses rows and keeps revenue. Count the accounts, not the domains." - Mehmet Suleyman, CEO at TechnologyChecker.io

Sales Signal: The Clarity corridor is a budget objection, not a feature gap, so retention material should lead with what replay saved rather than with what it can do. The 4,269 domains that have carried a FullStory detection since March 2026 and no longer do are the freshest win-back list on this page.

5. Technology ecosystem

Google Analytics sits on 88.02% of FullStory domains, which tells you nothing except that this is an analytics tag. React at 45.34% tells you a lot. Nearly half the installed base runs a React front end, roughly three times what we see under Microsoft Clarity or Hotjar, and it is the single strongest buying signal on this page. Vue.js adds 5.79%, React Router 3.83%, Angular 2.07%. Cloudflare fronts 39.18%. On the content side WordPress reaches only 11.83% and Shopify 8.44%, both low for a tag this widely deployed, which is another way of saying FullStory is not bought by marketing sites.

Sales Signal: React plus FullStory plus United States plus 51 or more staff is the highest-yield filter I can build from this data. It selects product and engineering teams running applications where a page-view count is useless and a replay is not.

6. G2 review signals

Across 197 G2 review mentions, the strongest praise is helpful and responsive customer support (34 mentions) and ease of use (33). The leading complaint is a steep learning curve (18), then performance issues (13) and cost (10). Ease of use and steep learning curve both ranking high is not a contradiction. Basic replay works immediately; the analytics layer underneath it does not. That maps onto the React finding: teams with engineers reach the second layer, teams without stay on the first and eventually notice they are paying for something a free tool also does.

Sales Signal: Lead outreach on responsiveness, because that is what this base says it values. If your product removes setup work or sits on top of FullStory's data, the learning-curve complaint is your opening line.

Key takeaways

1. The buyer signal is unusually clear. Software Development at 9.97%, React at 45.34%, and the United States at 5,802 of 10,277 matched domains all describe the same customer.

2. Domain share understates the account. 1.62% and 6th of 34 measures rows, and the three volume leaders above it are free or entry-priced. Its nearest paid rival, Contentsquare, is 5,124 domains ahead.

3. Read the level, not the long series. Our earlier coverage read higher, the crawled domain set turns over monthly, our detection signals have changed, and the audit of the old attributions came back inconclusive. 26,002 is the number to use.

4. Every migration corridor is net negative, and every one is small. 626 out against 436 in, on a window that opened in March 2026, for a tag seen exactly once on 54.5% of the domains it has ever appeared on.

Sales applications

Outreach template: "We can see [Company] running FullStory on a React front end. Most teams we talk to get real value out of replay and never reach the analytics layer underneath it. Which side of that are you on?"

Targeting strategy: React plus FullStory, United States, 51 or more employees, software, internet, or retail. That intersection is where the paid contracts sit.

Competitive angle: If you sell against FullStory, the Clarity corridor says price is the live objection. If you sell alongside it, the 1,051 domains above 200 staff are the accounts where a replay tool has already cleared a budget review.

Explore the full list of 26,002 domains running FullStory on TechnologyChecker.io, complete with firmographic enrichment, tech stack data, and migration patterns updated monthly.