How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- The best Auth0 alternatives in 2026 split between SaaS per-user platforms, cloud-infrastructure-priced services, and open source self-hosted platforms.
- Firebase Auth leads for mobile-first consumer apps, while Clerk leads for the fastest React and Next.js launch.
- Keycloak leads for zero licence cost and full data control, while FusionAuth leads for self-hosting without per-user fees.
- Okta leads for enterprise IAM with governance, while Amazon Cognito and Supabase Auth lead for AWS and Postgres teams at low cost.
- This guide lists alternatives only. Auth0 itself is not listed, since the question is what to use instead of it.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Firebase Auth | Mobile-first consumer apps | Free | Yes |
 Keycloak | Zero licence cost and control | Free | Yes |
 Clerk | React and Next.js launch speed | $25 per month | Yes |
 Okta | Enterprise IAM and governance | $6 per user per month | Free trial |
 Amazon Cognito | AWS-native teams | Free | Yes |
 Supabase Auth | Postgres-backed apps | $25 per month | Yes |
 FusionAuth | Self-hosting without per-user fees | See website | Yes |
 Stytch | Passkey-first and fraud-aware auth | See website | Yes |
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The best Auth0 alternatives
Starting priceFree
Free planYes
Firebase Auth suits mobile-first consumer apps and prototypes. It covers email, phone, social, and anonymous sign-in with SDKs for iOS, Android, and web, and the free tier reaches 50,000 monthly active users. Google platform reach adds analytics, crash reporting, and cloud functions alongside auth.
The trade is enterprise depth and lock-in. There is no first-class enterprise SSO, SAML and OIDC are free only to 50 users, and deep use couples you to Google Cloud. For a mobile consumer app that needs fast free auth, Firebase Auth leads.
What we like- Free to 50,000 monthly active users
- Mobile-first SDKs
- Google platform reach
Watch out for- No first-class enterprise SSO
- SAML and OIDC free only to 50 users
- Couples you to GCP
Starting priceFree
Free planYes
Keycloak suits teams that want zero licence cost and full data control. This open source identity platform covers single sign-on, SAML, OIDC, social login, and user federation with no per-user fee, and it runs on your own infrastructure. Regulated teams and privacy-sensitive teams keep user data in-house.
The limits are operations. You own upgrades, theming, and uptime, and setup takes expertise that a hosted service would handle. Support is community-based unless you buy it elsewhere. For a team that wants to kill per-user auth cost entirely, Keycloak leads.
What we like- Free under Apache 2.0
- Full data control
- SSO, SAML, OIDC, and social login included
Watch out for- You own upgrades, theming, and uptime
- Setup and tuning take expertise
- Support is community-based
Starting price$25 per month
Free planYes
Clerk is the most common Auth0 replacement for product teams whose front end is React or Next.js. It ships prebuilt, themeable auth components and organizations for light B2B multi-tenancy, tuned to the App Router, so a working sign-in flow takes hours rather than days. The Hobby plan is free to 50,000 monthly retained users per app, while Pro costs 25 dollars per month, or 20 dollars on annual billing.
The trade is enterprise depth and connection cost. Pro includes one enterprise connection, while extra connections cost 75 dollars per month each, and deep B2B tenant modelling is limited next to WorkOS or Okta. For a React team that wants the fastest launch, Clerk leads.
What we like- Fastest path to login for React and Next.js
- Prebuilt themeable components
- Free to 50,000 retained users
Watch out for- Pro costs 25 dollars per month
- Extra enterprise connections cost 75 dollars per month each
- Deep B2B tenant modelling is limited
#4Okta
Best for: Enterprise IAM and governance4.5/5 on
G2 (1,428 reviews, checked Oct 2026)
Visit okta.com
Starting price$6 per user per month
Free planFree trial
Okta suits enterprises that need IAM with governance and lifecycle. Workforce SSO starts at 6 dollars per user per month, with higher tiers to 17 dollars, and the platform covers provisioning, lifecycle, governance, and thousands of connectors. One vendor for workforce and customer identity simplifies procurement for large organizations.
The limits are price and complexity. Okta is priced for enterprises, not AWS-native startups, and Customer Identity enterprise pricing starts near 3,000 dollars per month. For an enterprise-bound SaaS product, Okta is the benchmark.
What we like- Enterprise IAM with governance and lifecycle
- Broad connector breadth
- Workforce and customer identity in one vendor
Watch out for- Priced for enterprises, not startups
- Customer Identity enterprise base near 3,000 dollars per month
- Complexity suits larger teams
Starting priceFree
Free planYes
Amazon Cognito suits teams already all-in on AWS. Direct sign-in is free for 10,000 monthly active users, then 0.015 dollars each on Essentials, and identity pools remain free. AWS integration keeps auth close to Lambdas, API Gateway, and S3 policies.
The trade is experience and portability. Developer experience trails Clerk, SAML and OIDC users get only 50 free before the same per-user charge, and Cognito cannot export passwords, since AWS stores only salted hashes. For an AWS-native team that wants the cheapest serious floor, Cognito leads.
What we like- Cheapest serious floor for AWS teams
- Direct sign-in free to 10,000 monthly active users
- Identity pools free
Watch out for- Developer experience trails Clerk
- SAML and OIDC users get only 50 free
- Password export is impossible
Starting price$25 per month
Free planYes
Supabase Auth suits apps whose backend already runs on Postgres. Auth ships bundled with database, storage, and realtime, so a full backend comes in one project, and the free tier reaches 50,000 monthly active users. Pro costs 25 dollars per month to 100,000 users, with extra users at 0.00325 dollars each, and the platform is fully open source and self-hostable.
The limits are B2B depth. Supabase Auth leans B2C and lacks a deep B2B organizations model, so enterprise tenant needs push teams elsewhere. For a Postgres-backed app or a Firebase migrator, Supabase Auth leads.
What we like- Free to 50,000 monthly active users
- Auth bundled with Postgres backend
- Fully open source and self-hostable
Watch out for- B2C-leaning, no deep B2B organizations model
- Pro costs 25 dollars per month
- Extra users cost 0.00325 dollars each
Starting priceSee website
Free planYes
FusionAuth suits regulated teams that want to self-host without per-user fees. The Community edition is free and unlimited, runs on your own AWS or servers, and covers passkeys, SSO, and multi-factor auth. Cloud plans exist for teams that prefer hosting, with Starter near 162 dollars per month on annual billing in some listings and cloud plans from 125 dollars per month in others, so the starting price here is written as See website.
The trade is licence and setup. The licence is not OSI-approved, which matters to strict open source policies, and self-hosting takes expertise. For an on-prem team that wants unlimited users without per-user billing, FusionAuth leads.
What we like- Community edition free and unlimited
- Self-host on your own AWS with no per-user fee
- Passkey support
Watch out for- Published prices differ across sources, so check the pricing page
- Licence is not OSI-approved
- Setup takes expertise
Starting priceSee website
Free planYes
Stytch suits mobile-first apps that want passkey-first auth with fraud awareness. It offers native passkey SDKs, embedded UX, and fingerprinting built in, which helps fraud-exposed consumer apps. A free tier covers evaluation, with per-user pricing near 0.05 dollars per monthly active user after the free allowance, so the starting price here is written as See website.
The limits are cost at scale and ecosystem. Per-user pricing adds up past the free tier, enterprise SSO adds cost, and the ecosystem is smaller than Okta. For a fraud-exposed consumer app that wants modern passwordless auth, Stytch leads.
What we like- Passkey-first modern auth
- Fraud fingerprinting built in
- Embedded UX for mobile-first apps
Watch out for- Per-user pricing after the free tier
- Enterprise SSO adds cost
- Smaller ecosystem than Okta
How we chose
We ranked platforms by developer speed, enterprise features, self-hosting options, pricing at scale, and fit for consumer or workforce use. We favored free tiers that reach 50,000 users, such as Firebase Auth, Clerk, and Supabase Auth, since they cover most startups, and we gave extra weight to self-hosted options for teams that need data control. We gave enterprise platforms credit for governance and lifecycle, since those decide large deployments more than sign-in speed.
We also weighed migration cost honestly. If a team spends six weeks migrating auth, that is roughly 30,000 to 60,000 dollars in engineering time, so a platform that saves 1,000 dollars a month pays back in 30 to 60 months, while one that saves 10,000 dollars a month pays back in 3 to 6 months. Model the payback before switching for price alone.
Buying guide
Start by naming your user type. Consumer apps suit Firebase Auth, Clerk, Supabase Auth, or Stytch, workforce SSO suits Okta, AWS-native teams suit Cognito, and self-hosters suit Keycloak or FusionAuth. B2B products with many enterprise SSO customers should weigh connection pricing, since per-connection fees dominate the bill past a few customers.
Next, model the bill at 10,000 and 50,000 users with your real enterprise customer mix. Free tiers differ in what they include: MFA, passwordless, custom domains, and enterprise SSO are paid features on most platforms. A platform that is free at 10,000 users but expensive at 50,000 costs more than a slightly pricier one that scales flat.
Finally, test migration before committing. Export users, confirm password hash portability, and run a pilot with one customer segment. Cognito cannot export passwords at all, while Firebase exports scrypt hashes with the CLI, so migration feasibility varies sharply by vendor and decides whether a switch is even possible without password resets.
Frequently asked questions
What is the best Auth0 alternative?
Clerk leads for React and Next.js speed, Keycloak leads for free self-hosting, and Okta leads for enterprise IAM. The best pick follows user type, enterprise SSO needs, and hosting preference.
Is Auth0 itself listed here?
No. This guide lists alternatives only, so Auth0 is not listed as its own alternative. The comparison covers what to use instead of it.
Which alternative is free at 50,000 users?
Firebase Auth, Clerk, and Supabase Auth all offer free tiers reaching 50,000 users, though enterprise features such as SAML and custom domains are paid on most of them.
Which alternative suits self-hosting?
Keycloak and FusionAuth Community suit self-hosting with no per-user licence fee, while Supabase Auth is fully open source and self-hostable. Self-hosting saves licence cost but adds server and staff time.
Can I migrate users without password resets?
It depends on the vendor. Firebase exports scrypt hashes with the CLI, while Cognito cannot export passwords at all. Check hash portability before committing to a switch.
Sources we checked (0)
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.