Keycloak vs Auth0: Which is Better in 2026?
Choosing between Keycloak and Auth0 comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Keycloak wins this matchup. LastPass is our overall Identity & Access pick. LastPass is our free Identity & Access pick. Pick Auth0 if you need a free tier to start with.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Keycloak
Open-source identity and access management
Best for you if:
- • You want a fully free tool (Auth0 requires payment)
Auth0
Identity platform for developers
Best for you if:
- • You want easy integration
| At a Glance | Auth0 | |
|---|---|---|
Starts at | Free 100% free | Free Free plan |
Category | Identity & Access Security | Identity & Access Developer Tools |
Rating | n/a | 4.5/5 G2 4.3 · Capterra 4.7 424 reviews |
Free plan | Yes | Yes |
Watch out for | n/a | Overage pricing at $0.07/MAU applies per user beyond the base limit. |
Choose Keycloak or Auth0?
Choose Keycloak if
- You want a fully free tool (Auth0 requires payment)
- You want open source identity
- You want self-hostable
Choose Auth0 if
- You want easy integration
- You want many features
In-Depth Analysis
Keycloak
Open-source identity and access management
Keycloak's pricing is exceptionally generous, being entirely free as an open-source solution.
Strengths
- Pro: Open source identity
- Pro: Self-hostable
- Pro: Feature rich
- Pro: No per-user cost
- Pro: Enterprise ready
Weaknesses
- Con: Complex to set up
- Con: Requires maintenance
- Con: Learning curve
- Con: Java-based
- Con: UI dated
Key features
Auth0
Identity platform for developers
Auth0's free tier at 25,000 MAUs is the most generous in the identity space, far ahead of Firebase Auth (free at 50K MAUs but with fewer features) and Clerk (500 MAUs free).
Watch out
Overage pricing at $0.07/MAU applies per user beyond the base limit.
Strengths
- Pro: Easy integration
- Pro: Many features
- Pro: Great docs
Weaknesses
- Con: Expensive at scale
- Con: Complex pricing
Key features
Pricing: Keycloak vs Auth0
| Plan | Keycloak | Auth0 |
|---|---|---|
| Tier 1 | Free Open Source | 0 forever Free |
| Tier 2 | N/A | 35 /month Essentials |
| Tier 3 | N/A | 240 /month Professional |
| Tier 4 | N/A | Custom /month Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Keycloak pricing and Auth0 pricing.
Key Takeaways
Keycloak
- Completely free
- Our pick for this comparison
Auth0
- Choose if you want identity platform for developers
The Bottom Line
Keycloak wins this matchup. LastPass is our overall Identity & Access pick. LastPass is our free Identity & Access pick.
Frequently Asked Questions
Is Keycloak or Auth0 better in 2026?
Keycloak wins this matchup. LastPass is our overall Identity & Access pick. LastPass is our free Identity & Access pick. Pick Keycloak for identity & access workflows (main strength: open source identity). Pick Auth0 for identity & access workflows (main strength: easy integration).
What are Keycloak and Auth0 used for?
Keycloak: Open-source identity and access management. Auth0: Identity platform for developers.
What does Keycloak cost vs Auth0?
Keycloak is free. Auth0 pricing is on their site.
What's the main difference between Keycloak and Auth0?
Keycloak's main strength: open source identity. Auth0's main strength: easy integration.