FusionAuth
An identity and user management server with SSO, MFA and OAuth2 that can be self-hosted.
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About FusionAuth
FusionAuth provides login, user management and authorization for applications. It supports single sign-on, multi-factor authentication, OAuth2 and OpenID Connect, and every capability is available through an API. It can authenticate people, services and AI agents with fine-grained access control.
It can run self-hosted, on-premises, air-gapped or as a dedicated hosted deployment. A free Community edition is available to download, and quickstarts cover frameworks such as .NET, Django, Rails, Spring Boot and Next.js. It suits teams adding authentication to their own products.
Strengths
- Can run self-hosted, on-premises or air-gapped
- Supports SSO, MFA, OAuth2 and OpenID Connect
- Full API plus quickstarts for many frameworks
- Free Community edition
Limitations
- Aimed at developers building apps rather than managing staff accounts
- Advanced features require paid plans
Details
- Pricing
- FreemiumFree Community edition to download, with paid plans and hosted deployments.
- License
- Proprietary
- Developer
- FusionAuth
- Platforms
- Web, Self-hosted
- How it runs
- Self-hosted, Hosted service
- Works offline
- Yes
- Best suited for
- Development teams that want to run their own login and user management server
- Categories
- Developer tools, IT administration
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to FusionAuth
Compare allSoftware that can replace FusionAuth for an important use case, and what changes if you switch.
Keycloak
A self-hosted identity and access management server that adds single sign-on and login to applications.
Keycloak is fully open source under Apache-2.0, offering SSO with OpenID Connect and SAML brokering plus LDAP and Active Directory connections.
Zitadel
An open-source identity and access management platform with SSO, MFA and a hosted login page.
Zitadel is open source and self-hostable, with multi-tenancy, passwordless login, SDKs and a customisable hosted login page for app developers.
Casdoor
A self-hosted identity and access management server with single sign-on, MFA and a web interface.
Casdoor is open source under Apache-2.0 and supports OAuth, OIDC, SAML, CAS, LDAP and SCIM with a web UI, but its broad scope adds complexity.
Kanidm
An open-source identity management server offering OAuth2, LDAP and passkey login from one place.
Kanidm is an open-source identity server with OAuth2, LDAP and passkeys plus Linux login integration, aimed more at self-hosters than app developers.
Microsoft Entra ID
Microsoft's cloud identity and access management service, formerly Azure Active Directory, with single sign-on support.
Microsoft Entra ID moves identity into Microsoft's paid cloud with SSO, focused on staff accounts rather than self-hosted app login.
Similar software
Related functionality, not necessarily a direct replacement.
privacyIDEA
Open-source, self-hosted multi-factor authentication server that manages OTP and other token types.
Pomerium
An identity-aware reverse proxy that gives secure access to internal applications without a VPN.
LLDAP
A lightweight LDAP server for managing users and groups through a simple web interface.
JumpCloud
A cloud directory platform for managing user identities, access and devices across several operating systems.
