Best Self-Hosted Authentication and SSO Platforms in 2026
An Auth0 you own: OIDC, SAML and MFA that run on your own servers, not someone else's per-user meter.
Keycloak is the default self-hosted IAM pick for teams that need mature OIDC and SAML with no per-user cost. Ory suits engineers who want composable, API-first identity infrastructure instead of one monolith. Zitadel targets B2B SaaS with multi-tenant orgs and SCIM baked in. SuperTokens and Logto fit developer teams that want a modern login UI and SDKs without operating a full IAM stack.
Every managed auth provider eventually hits the same wall: pricing scales with monthly active users, and a login screen becomes a line item that grows faster than the product it protects. Self-hosting the identity layer removes that meter entirely and keeps user credentials inside infrastructure you control, which matters for regulated industries, data residency requirements, and anyone who has watched an MAU bill double after a good growth quarter. From the 10,000+ tools Toolradar tracks, these are the identity and SSO platforms you can self-host, an Auth0 you own.
Every tool below was checked for an active open-source or source-available self-hosting path, not just a "free trial" of a hosted product. We verified license terms (Apache 2.0, AGPL, MIT, or FusionAuth's free-as-in-beer Community license), confirmed the self-hosted edition is still maintained in 2026, and dropped anything that has quietly become cloud-only. Ranking favors real-world production readiness: protocol coverage (OIDC, SAML, LDAP), MFA support, and how much operational burden you take on by running it yourself.
Top Picks
Based on features, user feedback, and value for money.
| Tool | Starting price | Rating | Best for |
|---|---|---|---|
| Keycloak | Free | 4.3(101) | Teams that need mature OIDC, SAML, and LDAP federation with zero licensing cost |
| Ory | Free plan | 4.5(50) | Engineering teams that want API-first, headless identity components instead of one mono... |
| Zitadel | Free plan | n/a | B2B SaaS products that need customer organizations, SCIM provisioning, and audit trails |
| Logto | Free plan | n/a | Developer teams that want an Auth0-style experience without the per-MAU bill |
| SuperTokens | From $100/mo | 4.9(5) | Product teams that want to own the auth code path without running a separate full IAM s... |
| Authelia | Free | n/a | Home labs and small teams adding 2FA/SSO to existing apps behind Nginx, Traefik, or Caddy |
| FusionAuth | From $125/mo | 4.6(179) | Teams that want an Auth0-style single binary with enterprise features unlocked in the f... |
| Casdoor | Free | n/a | Teams that want everything configured through a web console instead of config files |
Teams that need mature OIDC, SAML, and LDAP federation with zero licensing cost
Keycloak's pricing is exceptionally generous, being entirely free as an open-source solution.
Watch out
Infrastructure hosting costs (servers, networking)
Engineering teams that want API-first, headless identity components instead of one monolithic server
Ory's pricing is quite fair, offering a generous Free tier for up to 25,000 users, which is significantly higher than many competitors.
Watch out
Overage fees for users beyond Growth tier's included amount
B2B SaaS products that need customer organizations, SCIM provisioning, and audit trails
Zitadel's pricing is quite generous, especially with its robust open-source offering at $0.
Watch out
Overage fees likely for MAU beyond 25K on Cloud
Developer teams that want an Auth0-style experience without the per-MAU bill
Logto's Free tier is quite generous, offering 50,000 MAU and 50K tokens, which is more than many competitors.
Watch out
Overage fees for MAU/tokens beyond free tier
Product teams that want to own the auth code path without running a separate full IAM server
SuperTokens offers a very generous freemium model, especially with the Self-Hosted option providing unlimited MAUs for free.
Watch out
Cloud Paid has $100 minimum
Home labs and small teams adding 2FA/SSO to existing apps behind Nginx, Traefik, or Caddy
Authelia offers an incredibly generous pricing model as it is entirely free and open-source.
Watch out
Requires self-hosting infrastructure
Teams that want an Auth0-style single binary with enterprise features unlocked in the free tier
FusionAuth offers a generous free Community tier, making it highly accessible.
Watch out
Potential for MAU overage fees (not specified)
Teams that want everything configured through a web console instead of config files
What Is Self-Hosted Authentication?
Self-hosted authentication means running the identity provider, the service that verifies who a user is and issues tokens, on infrastructure you control instead of calling out to a third-party API. That can mean a full IAM platform like Keycloak that manages realms, users, and federated logins, a headless identity API like Ory Kratos that you wire into your own frontend, or a reverse-proxy authenticator like Authelia that adds SSO and MFA in front of existing apps without touching their code.
Most of these platforms speak the same standard protocols as their SaaS competitors: OpenID Connect (OIDC) for modern app login, SAML for enterprise single sign-on, and LDAP for directory integration. The difference is deployment: you run the container, you own the database holding password hashes and sessions, and you patch it. In exchange you get no per-MAU pricing, full control over data residency, and the ability to customize login flows down to the source code.
Why Self-Hosted Auth Matters
Hosted identity providers price by monthly active user, and that model breaks down exactly when a product succeeds. A B2C app that goes from 10,000 to 500,000 users can see its auth bill jump from a rounding error to a five- or six-figure annual line, for a feature that does not get materially better as usage grows. Self-hosting decouples cost from user count: the bill becomes server capacity, which grows far more predictably.
Data control is the other driver. Healthcare, fintech, government, and EU-based teams increasingly need to prove exactly where credentials and personal data live, and a self-hosted identity provider inside your own VPC or on-prem cluster is the cleanest way to answer that question. The tradeoff is real: you now own uptime, patching, and backup for a system that, if it goes down, locks every user out of everything. Picking the right platform means matching its operational weight to your team's actual capacity to run it.
Key Features to Look For
Standards-based protocols so you can federate with Google Workspace, Okta, or enterprise SAML IdPs without custom integration work.
TOTP, WebAuthn/passkeys, and backup codes built in, not bolted on through a third-party plugin.
Docker images, Helm charts, and documented production deployment guides, not just a quick-start demo container.
A permissive or clearly-scoped copyleft license (Apache 2.0, MIT, AGPL) so you know exactly what self-hosting entitles you to for free.
Native support for separate realms, organizations, or tenants if you're building a B2B product that resells access to other companies.
A usable web console for managing users, roles, and login flows, versus needing to hand-edit config files for every change.
Mistakes to Avoid
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Treating a self-hosted identity provider as a set-and-forget deployment: it needs the same patch cadence and monitoring as any other security-critical service.
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Choosing a full IAM platform like Keycloak when a lightweight proxy authenticator like Authelia would have covered the actual need, and paying for that operational weight in maintenance time.
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Ignoring the license terms: AGPL projects like Zitadel require sharing modifications used to offer the software as a service, which matters if you plan to resell access.
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Skipping a real backup and disaster recovery plan for the identity database, since losing it locks out every user simultaneously.
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Underestimating the initial setup time for standards-heavy platforms like Ory, which trade a steeper learning curve for long-term flexibility.
Expert Tips
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Run the identity provider on infrastructure separate from the app it protects, so an app outage doesn't cascade into a login outage.
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Enable WebAuthn/passkeys early even if adoption starts low: it's the strongest phishing-resistant MFA option and most of these platforms support it natively.
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For B2B products, check multi-tenancy support before committing: retrofitting organization-level isolation into a single-tenant setup later is expensive.
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Test the token refresh and session revocation flows under load before launch: this is where self-hosted setups most often differ from what a hosted provider handled invisibly.
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Keep a documented rollback plan for identity provider upgrades: a broken auth deploy blocks every other feature in the product at once.
The Bottom Line
There's no single best self-hosted auth platform, only the right fit for how much operational weight your team can carry. Keycloak remains the safest default for standards-heavy enterprise needs, Ory and Zitadel suit teams building custom or multi-tenant B2B flows, and Authelia or SuperTokens fit smaller, lighter deployments. From the 10,000+ tools Toolradar tracks, these are the identity and SSO platforms you can self-host, an Auth0 you own.
Frequently Asked Questions
What is the best free self-hosted alternative to Auth0?
Keycloak is the most direct free alternative, matching Auth0's OIDC and SAML coverage with no per-user cost. Zitadel and Logto are close seconds for teams that want a more modern developer experience, and FusionAuth's Community edition offers unlimited free users if you don't mind a source-available rather than fully open-source license.
Is Keycloak really free to self-host?
Yes. Keycloak is licensed under Apache 2.0 and every core feature, including OIDC, SAML, LDAP federation, and multi-realm support, is free with no user or usage caps. Red Hat offers a paid, supported distribution built on Keycloak, but the upstream open-source project itself carries no cost.
Which self-hosted auth platform is easiest to set up?
FusionAuth and Authelia are the fastest to stand up, both deploying as a single container with minimal configuration. Casdoor's UI-first approach also skips config files entirely. Keycloak and Ory take longer to configure properly for production because they expose more architectural decisions up front.
Can I self-host authentication without running my own OAuth2 server?
Yes, if you use SuperTokens or FusionAuth, both handle the full authentication and session flow directly without requiring you to separately stand up an OAuth2/OIDC authorization server. Ory splits this deliberately: Kratos handles identity while Hydra is the dedicated OAuth2 and OIDC provider you deploy alongside it.
What license should I check before self-hosting an identity provider?
Look for Apache 2.0 or MIT if you want unrestricted use, including reselling the software as a service. AGPL, used by Zitadel, is free to self-host but requires sharing your modifications if you offer a modified version as a service to others. FusionAuth's Community edition is free but source-available under a proprietary license, not an OSI-approved open-source license.