Companies Using GrowthBook

I've spent a lot of time on how experimentation tools show up in a crawl, and GrowthBook needed more taking apart than most. Our October 2026 crawl found its SDK on 5,443 raw domains. The detection itself is sound: on 40 random domains, every one of the 31 pages that loaded was running GrowthBook. The question was whose GrowthBook, because 13 of those 31 were ShopDeck stores. With them removed, GrowthBook is on 3,706 domains, 11th of 33 in A/B Testing & Experimentation, with 1,696 matched to a company.

Why ShopDeck is out

ShopDeck builds online stores for Indian direct-to-consumer brands; its site says more than 5,000 brands use it. Every ShopDeck store I inspected loaded GrowthBook with the same client key, through the same CloudFront proxy, and the feature list read like ShopDeck's product roadmap: a checkout revamp, autofill changes, pricing and ratings experiments. Those merchants never chose GrowthBook. ShopDeck did, once. So we removed 1,722 ShopDeck storefronts, which moved GrowthBook from 5,448 domains and 9th place to 3,706 and 11th.

Sales signal: experimentation buyers are the 3,706. If you sell to ShopDeck merchants, the stores are a list of their own, but they aren't GrowthBook buyers.

Where the count stands

The chart has a single October point, the first month on the cleaned count, so there's no trend to read. Churn needs the same care. 1,542 domains dropped GrowthBook on at least one hostname since we began tracking it in March 2026. Of the drops we examined in October, 117 still ran it on another hostname, 182 now host gambling pages (expired domains with new owners) and 122 were ShopDeck stores.

"GrowthBook's browser footprint is about 3,700 sites. ShopDeck's 1,722 stores looked like customers, and they were one customer." - Mehmet Suleyman, CEO & Co-founder at TechnologyChecker.io

Sales signal: treat GrowthBook's visible base as a few thousand domains. Its server-side use, which we can't count, is where most of its growth would show, so don't judge the company by this number.

Who the customers are

37.55% of matched companies with a known size have 1 to 10 employees and 27.52% have 11 to 50. 19.48% were founded in the 2020s. Above them is a real enterprise tail of 87 companies with more than 1,000 staff, and the named ones are worth reading: EDF Energy, Bright Horizons, Jumeirah, Würth's e-shop, Zara Home and Lefties (both on Inditex's shared setup), and The New Yorker, SELF and Bon Appétit. Several call their own GrowthBook API hosts, TED among them, which usually means self-hosting or GrowthBook's proxy.

Sales signal: the enterprise rows are likely engineering-led buyers who picked an open-source tool they could host. Pitch data-warehouse integrations and developer tooling, not a visual editor.

Industry and geography

The United States has 717 matched companies and the United Kingdom 153. The ten European countries in our top 15 add up to 445, and Brazil and India have 44 each. Industries are spread thin. Software Development leads at 8.69%, Technology, Information and Internet and Retail have 5.07% each, and the top ten cover 38.84%. Wellness and Fitness (3.81%) stands out, partly because Smartfit runs it on 12 domains, and travel is a cluster of its own: Jumeirah, Silversea, GNV and eSky, whose key also runs thomascook.com.

Sales signal: for Europe, filter to the United Kingdom, the Netherlands and Germany; for Latin America, Brazil. Software and internet companies are the biggest single group to work.

Switching

This page has no switching table, and that's deliberate. Our records showed 155 domains leaving GrowthBook for VWO. When I checked them, 116 were Indonesian gambling pages on expired domains, often copying another site's code with VWO's tag inside, and 8 had no site. About 24 belonged to working businesses. The two Optimizely rows were mostly Salesforce: 29 of the 39 gains and 16 of the 18 losses were Salesforce-owned domains, many of them redirects. The cleanest flow was 24 domains gained from VWO, about 18 businesses, Blue Bottle Coffee, PizzaExpress and Miller's Ale House among them.

"Strip out the expired domains and the redirects, and GrowthBook and VWO trade about two dozen working sites each way. That's a stand-off, not a rout." - Mehmet Suleyman, CEO & Co-founder at TechnologyChecker.io

Sales signal: 133 domains run GrowthBook and VWO side by side today. Those are teams with two testing bills, the best-qualified consolidation prospects on the page.

The stack around it

Across the 3,706 domains, Google Analytics runs on 74.42%. Next.js leads the frameworks at 29.92%, with Vue.js on 13.28% and React on 10.55%, and Amazon Web Services hosts 23.34%. Product analytics is thin: PostHog on 5.91%, Amplitude 3.97%, Mixpanel 3.59%. GrowthBook reads results from a company's own data warehouse, so a missing analytics tag doesn't mean missing analysis.

Sales signal: Next.js teams on AWS or Vercel are the core profile. Warehouse, event pipeline and CDP vendors have a natural opening here.

Price and licence

GrowthBook's pricing page, checked on 13 October 2026, lists a free Starter plan for up to 3 users, Pro at $40 per seat per month for up to 30 users, and custom Enterprise pricing. Its GitHub repository is under the MIT licence outside three enterprise directories. That pricing fits a list that leans small, though we can't see which plan any domain is on.

Sales signal: per-seat pricing caps at 30 users on Pro, so growing teams hit an Enterprise conversation early. That's the moment a rival can get in.

Key takeaways

1. 3,706 domains, 11th of 33, after removing 1,722 ShopDeck stores on one account.

2. Without the 87 video-script sites, about 3,619 remain.

3. A real enterprise tail of 87 large companies, some calling their own GrowthBook hosts.

4. The apparent switch to VWO was mostly gambling pages; real flows are about two dozen each way.

5. Next.js on AWS, with Google Analytics, is the typical stack.

How to use this list

Start by excluding the 87 video-script sites. For outreach, lead with the setup you can see: "You run GrowthBook alongside VWO; we help teams consolidate." For targeting, filter to companies above 200 staff in the United States, United Kingdom and Netherlands. Our guide to how technology detection works explains why server-side tools are hard to see. For the full list of 3,706 GrowthBook domains with company, size and stack data, explore TechnologyChecker.io.