# Authentication & identity providers

12 apps ranked by verified data.
Source: https://altcatalog.com/category/auth-providers/

## Apps

- [Amazon Cognito](https://altcatalog.com/alternatives/cognito.md) — AWS-managed customer identity service with social login, MFA, and passkeys
- [Auth0](https://altcatalog.com/alternatives/auth0.md) — Enterprise-grade authentication and authorization platform
- [Clerk](https://altcatalog.com/alternatives/clerk.md) — Drop-in authentication and user management for modern apps
- [Descope](https://altcatalog.com/alternatives/descope.md) — Drag-and-drop CIAM platform for building login, MFA, and passkey flows without code
- [Frontegg](https://altcatalog.com/alternatives/frontegg.md) — B2B identity platform bundling auth, multi-tenant org management, and admin UI
- [FusionAuth](https://altcatalog.com/alternatives/fusionauth.md) — Self-hostable or cloud auth platform with a free-to-self-host community edition
- [Keycloak](https://altcatalog.com/alternatives/keycloak.md) — Open-source identity and access management you self-host
- [Kinde](https://altcatalog.com/alternatives/kinde.md) — Auth, billing, and access management for SaaS with usage-based free tier
- [Ory](https://altcatalog.com/alternatives/ory.md) — Open-source identity infrastructure (Kratos, Hydra, Keto) for login, OAuth2, and permissio
- [Stytch](https://altcatalog.com/alternatives/stytch.md) — Authentication and fraud-prevention APIs for developers
- [WorkOS](https://altcatalog.com/alternatives/workos.md) — Enterprise-readiness APIs: SSO, SCIM directory sync and more
- [Zitadel](https://altcatalog.com/alternatives/zitadel.md) — Go-based open-source identity platform with built-in multi-tenant organizations

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Ranked by verified data, never by who paid. https://altcatalog.com/trust/