FusionAuth alternatives.
Teams leave FusionAuth for OSI procurement, for a vendor SOC 2 they do not want to earn, or because they never needed a binary. This page ranks replacements by that pain.
Ranked on: best replacement by pain point
Read the FusionAuth profile for the full verdict these pains are drawn from.
Why teams leave FusionAuth
The alternatives, ranked
Keycloak
OSI, ecosystemProcurement rejected the FusionAuth license.
Keycloak wins when Apache 2.0 and the install base are the requirement.
Heavier ops. Larger community. Bare passkey UI.
- Best for
- Public sector and teams blocked on OSI.
- Watch out for
- You are trading a license conversation for an FTE conversation.
Auth0
SaaS generalistYou do not want to run FusionAuth Cloud or a binary.
Auth0 wins FGA, agents, and vendor attestations.
MAU curve is the bill you left Auth0 to avoid, if that was the original path.
- Best for
- Teams that used FusionAuth as a cheaper Auth0 and now want the ecosystem back.
- Watch out for
- At 1M MAU Auth0 is about $9,500 vs FusionAuth about $3,000. Know why you are paying it.
SuperTokens
self-host coreFusionAuth is more platform than you needed.
SuperTokens wins a session-centric self-host with a smaller surface.
Not a full CIAM admin suite. Good when the app is still the source of truth.
- Best for
- Engineering teams that over-bought FusionAuth for a single app.
- Watch out for
- Enterprise SSO catalog is thinner. Verify the B2B path.
Clerk
stop self-hosting, Next.jsThe binary was a mistake. The app is React.
Clerk wins if you never needed self-host and you want UI this week.
MAU pricing returns. Sovereignty ends.
- Best for
- Product teams that inherited FusionAuth from an infra preference.
- Watch out for
- Compliance and federation are weaker. Do not do this for FedRAMP theater.
Ory
modular OSSYou want OSI and cloud-native parts.
Ory wins the modular self-host path FusionAuth will not take.
More assembly. More purity.
- Best for
- Platform teams that rejected FusionAuth on license and Keycloak on monolith.
- Watch out for
- Operations do not get easier.
Pain to pick
Map your specific problem to the pick that removes it.
| If your problem is | What fixes it |
|---|---|
| OSI / procurement | Keycloak, Ory |
| Stop operating identity | Auth0, Clerk |
| Smaller self-host core | SuperTokens |
Comparison table
Pulled from each vendor's capability matrix. Last verified 2026-08-19.
| Capability | FusionAuth | Keycloak | Auth0 | SuperTokens | Clerk |
|---|---|---|---|---|---|
| Deployment | self hosted, cloud SaaS, on prem, hybrid | self hosted, on prem, hybrid | cloud SaaS | self hosted, cloud SaaS | cloud SaaS |
| Segment fit | B2C, B2B SaaS, enterprise | B2C, B2B SaaS, enterprise, public sector | B2C, B2B SaaS, enterprise | B2C, B2B SaaS, developer tools | B2C, B2B SaaS |
| Pricing model | tiered MAU | free open source | tiered MAU | tiered MAU | tiered MAU |
| Native passkeys | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes |
| B2B Orgs / Enterprise SSO | Orgs ✓ · SSO ✓ | Orgs ~ · SSO ✓ | Orgs ✓ · SSO ✓ | Orgs ✓ · SSO ✓ | Orgs ✓ · SSO ✓ |
| FedRAMP | ✕ No | ✕ No | High (via Okta) | ✕ No | ✕ No |
| Fine-grained authz | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ~ Partial |
| Free-tier ceiling | Yes | Yes | 25k MAU | Yes | 10k MAU |
How to choose
- If the license is the blocker, Keycloak, or Ory if you will assemble.
- If operating identity is the blocker, Auth0, or Clerk if the app is Next.js and small.
FAQ
- What is the best alternative to FusionAuth?
- Keycloak for OSI and ecosystem. Auth0 to stop self-hosting. SuperTokens for a smaller core. Clerk if you over-bought and the app is Next.js. Stay if MAU-independent cost is still the win.
- Is FusionAuth open source?
- Community is free under a custom Apache-2.0-style license, not OSI-certified. That distinction is why this alternatives page exists.
- Can I move from FusionAuth Cloud to Auth0 later?
- Yes, as a migration, not as a toggle. Hashes and users export. Actions vs lambdas do not. Budget 60 to 90 days.
Keep reading
Editorial note
This page ranks on one stated axis and nothing else. Every vendor is scored on the same matrix, every pick links to its internal profile, and we take no vendor money, no affiliate links, no paid placement. If you believe a claim is inaccurate or out of date, see the disclaimer for how to reach the editorial team. Last verified 2026-08-19.