Companies Using Auth0

With over a decade of experience in web crawling and technographic data analysis, I've examined Auth0's position in the identity-as-a-service market using our enriched dataset of 5,845 companies matched from 6,510 active detections, as of our March 2026 crawl. Auth0 was co-founded in 2013 by Eugenio Pace and Matias Woloski (source: auth0.com/blog/announcing-auth0), raised over $210 million across six funding rounds (source: VentureBeat), and was acquired by Okta for $6.5 billion in May 2021. The platform now processes 2.5 billion authentications per month (source: auth0.com). Here's what the data reveals.

Growth trajectory

Auth0's adoption curve has two distinct phases. From 2014 to mid-2021, growth was organic and steady, reaching just 455 active domains over seven years. Then between July and October 2021, active domains jumped from 455 to 2,220, coinciding with Okta's acquisition. By December 2024, Auth0 hit its all-time peak of 6,831 active domains. That's a 15x increase in just three years.

One data point that explains why companies keep buying identity infrastructure: Auth0's 2025 Customer Identity Trends Report found that 46.1% of all new signups across the platform met criteria for a fraudulent attack (source: auth0.com/customer-identity-trends-report). And 16.9% of login attempts showed clear malicious behavior. Building this detection in-house is expensive; buying it from Auth0 isn't.

"The 2021 spike wasn't organic product-market fit. It was Okta's sales machine cross-selling Auth0 into its enterprise customer base. The real question is whether that growth sticks." - Mehmet Suleyman, CEO at TechnologyChecker.io

Sales Signal: Auth0's rapid post-acquisition growth means there's a large cohort of relatively new customers (2021-2024 adopters) still evaluating the platform. These companies are in the consideration window for complementary identity tools, migration services, and integration consulting.

Customer profile

42.1% of Auth0 customers have 1-10 employees, and 65.9% have fewer than 50. This is a platform built by developers, for developers, adopted overwhelmingly by small teams. The 2010s and 2020s account for 73.1% of customers by founding decade, confirming Auth0's core audience is digital-native companies.

The enterprise tail tells a different story. Auth0 runs on subdomains at Siemens (z003cc4p.login-dev.siemens.com), CVS Health (auth-dev.cvshealth.com), and Pfizer (auth-lwhs.pfizer.com). Many of these are dev or staging environments, not company-wide rollouts. But vendor-published case studies confirm real production use. McLaren Racing uses Auth0 for fan SSO across web and mobile, targeting 500 million+ fans. Flo Health (167M downloads, 38M MAU) saw sign-ups jump from 6% to 75% after adding Auth0 social logins. Dunelm, the UK's #1 homewares retailer, estimates Auth0 replaced a team of 8-10 dedicated security developers. HolidayCheck saves €2,500 per day. And Nordcloud (now IBM) integrated Auth0 with five applications in two weeks, reporting 300% ROI on development costs.

Sales Signal: The small-company concentration (66% under 50 employees) creates a natural upsell market. These companies need SSO, MFA, and compliance features as they grow. The sweet spot is companies in the 11-50 range outgrowing the free tier's 25,000 MAU cap.

Industry and geographic concentration

Software Development dominates at 22.84%, followed by Technology/Internet (9.36%) and Financial Services (7.45%). These three verticals alone represent 39.65% of Auth0's customer base. It's a tech-heavy skew, but not as extreme as you might expect: healthcare (2.55%), insurance (1.64%), and real estate (1.64%) all show meaningful adoption.

Geographically, the United States leads with 50.3% of customers. The UK (8.0%), Canada (3.7%), and Australia (3.7%) follow. English-speaking markets account for over 65% of the base. Germany (3.3%) is the largest non-English market, driven by Auth0's European enterprise deals with companies like Siemens and Fresenius Medical Care. The vendor's own case studies skew heavily European: Dunelm (UK), HolidayCheck (Germany), GrandVision (Netherlands), Nordcloud (Finland), and NHS Leadership Academy (UK). Scandinavian countries (Norway, Sweden) show surprisingly strong representation at 1.1% each.

Sales Signal: Financial services at 7.45% is the highest-value vertical for identity products, given compliance requirements (SOC 2, GDPR, PCI-DSS). Companies in this segment using Auth0 likely need additional security tooling. The Nordics are an underserved growth region worth targeting for localized identity solutions.

Migration patterns

Auth0 is a net gainer from every competitor we tracked. The standout corridor is Azure Active Directory: 1,696 companies dropped Azure AD and adopted Auth0, while only 952 went the other direction. That's a 1.8:1 gain ratio. Against its parent company Okta's workforce product, Auth0 gained 285 companies while losing just 89 (3.2:1 ratio). Amazon Cognito shows a tighter battle at 175 gained vs. 142 lost (1.2:1).

"The Azure AD-to-Auth0 migration flow is the largest in the category. It tells you enterprise IT teams are splitting workforce identity (Azure AD/Okta) from customer identity (Auth0). That's a structural market shift, not a vendor preference." - Mehmet Suleyman, CEO at TechnologyChecker.io

Sales Signal: Companies migrating from Azure AD to Auth0 are actively rearchitecting their identity stack. They're likely investing in customer-facing applications and need complementary tools: consent management, fraud detection, and user analytics. The Okta-to-Auth0 corridor (3.2:1 ratio) is interesting since both products sit under the same corporate umbrella, suggesting customers are consolidating toward Auth0 for CIAM-specific use cases.

Technology ecosystem

Auth0 customers show a distinct tech stack. Google Analytics (74.69%) and Global Site Tag (70.16%) are near-universal for web apps. More revealing: Hotjar at 21.58% and FullStory at 6.42% point to product-led growth companies invested in user experience analytics.

The JavaScript framework mix is noteworthy. styled-components (16.5%), AngularJS (16.4%), and Material-UI (16.0%) all cluster at ~16%, with no single framework dominating. Auth0 itself has shipped framework integrations for LangChain, LlamaIndex, Google GenKit, and Vercel AI SDK as part of its new Auth0 for AI Agents product (source: auth0.com/blog/introducing-auth0-for-ai-agents), launched in April 2025. Atlassian Cloud at 23.08% confirms the engineering-heavy customer profile. Intercom at 13.9% reinforces the SaaS orientation.

Sales Signal: The high Hotjar (21.58%) and FullStory (6.42%) adoption points to product-led growth companies. These teams care about conversion optimization and respond well to ROI-focused messaging. The Auth0 for AI Agents launch signals where the platform is headed, and companies building agentic workflows will need identity tooling that supports asynchronous authorization and token vaults for third-party API calls.

G2 review signals

G2 reviews show ease of use as the top positive signal (47 mentions), followed by security features (37 mentions) and flexibility (39 mentions). The ease-of-use praise aligns with specific vendor case studies: Flo Health's CTO Roman Bugaev said "authentication is kind of a solved problem already, and we realized we just needed to take the best solution from the market" (source: auth0.com/case-studies/flo-health). Dunelm's Head of Data Platforms, Antony Sohal, put it more bluntly: "Auth0 can do authentication much better than we can" (source: auth0.com/case-studies/dunelm).

On the negative side, pricing complexity leads with 42 mentions. Our migration data confirms it: the Auth0-to-Cognito flow (142 companies lost) likely includes cost-conscious startups switching to AWS's simpler pricing. Variable customer support quality (26 mentions) aligns with Auth0's tiered model where free and Essentials plans get community support only. A SecurityBoulevard article (2025) specifically documents developer frustration with post-acquisition support quality.

Sales Signal: Pricing is the #1 complaint and migration to cheaper alternatives is measurable in our data. Auth0's free tier offers 25,000 MAUs, but the jump to paid starts at $35/month for just 500 MAUs (source: auth0.com/pricing). Companies growing past 10,000 MAUs on the Professional plan ($240/month for 500 MAUs) face steep increases. These companies are prime targets for pricing-competitive alternatives.

Key takeaways

1. Auth0 ranks #3 in Authentication & SSO with 6,510 active domains and 1.22% market share, trailing only Azure AD and Amazon Cognito.

2. The post-acquisition growth was dramatic: 15x increase from mid-2021 to late 2024, driven by Okta's enterprise sales channel. Okta + Auth0 now serve 18,000+ customers combined (source: Okta ESG Report 2024).

3. Small teams dominate: 66% of customers have fewer than 50 employees, but Fortune 500 companies like Siemens, Pfizer, and P&G validate enterprise capability.

4. Auth0 is a net gainer from all competitors, with the strongest migration flow from Azure AD (1.8:1 gain ratio). This reflects the industry-wide shift toward separating workforce and customer identity.

5. Vendor case studies show real ROI: 12.5x sign-up growth (Flo Health), €2,500/day savings (HolidayCheck), 300% ROI (Nordcloud), and 8-10 FTE saved (Dunelm). These are verifiable claims published on auth0.com.

6. Auth0 for AI Agents (launched April 2025) positions the platform for agentic workflows with Token Vault, async authorization, and fine-grained access for RAG. This could reshape how identity infrastructure serves the next generation of applications.

Sales applications

For prospecting, filter TechnologyChecker.io for companies using Auth0 in the 11-50 employee range, founded 2015-2022, in Software Development or Financial Services. These companies are likely outgrowing the free tier and evaluating paid plans or alternatives.

Outreach template: "Hi [Name], I noticed [Company] uses Auth0 for authentication. With [X] employees and growing, you're likely hitting the MAU pricing tiers. Our [product/service] helps Auth0 customers [specific benefit]. Companies like [similar company from our data] reduced their identity costs by [X%] after [specific action]."

Competitive angle: The 142 companies that migrated from Auth0 to Amazon Cognito in the last 3 years represent a clear cost-driven churn pattern. Target companies in the 1,000-10,000 MAU range on Auth0's Professional plan, where the price-per-user gap widens most.

For the complete dataset of 5,845 enriched Auth0 companies with industry, size, and location filters, visit TechnologyChecker.io's Auth0 technology page.