Prompt
Auth0 alternatives for SaaS app login
Latest observation
Here are solid Auth0 alternatives for a SaaS app login, grouped by the kind of product fit.
Best all-around alternatives
- Firebase Authentication
Good if you want fast setup, social logins, email/password, and tight integration with Google Cloud / Firebase. - Clerk
Very popular for modern SaaS apps. Excellent UX, prebuilt auth UI, orgs, and user management. Great for startups and product teams. - WorkOS
Best if you need enterprise SSO/SAML/SCIM for B2B SaaS. Usually paired with your own auth or another provider. - Supabase Auth
Good if your app already uses Supabase/Postgres. Straightforward auth with social logins, magic links, and JWT-based access. - AWS Cognito
Scales well and can be cost-effective, but the developer experience is often considered rougher than Auth0/Clerk.
If you want open-source / self-hosted
- Keycloak
Strong enterprise features, self-hosted, supports SSO/SAML/OIDC. Powerful but heavier to operate. - Ory (Kratos/Hydra)
More modular and developer-focused. Good for teams that want control and are okay with more setup. - FusionAuth
Self-hosted or cloud. Good feature set, often seen as a more developer-friendly Auth0 alternative.
If you need enterprise B2B features
- WorkOS — best for enterprise SSO, directory sync, SCIM
- Okta Customer Identity — enterprise-grade, but can be expensive/complex
- Ping Identity — more enterprise-oriented
- Keycloak — if you want to self-host enterprise features
If you want a simple hosted auth service
- Clerk — best UX for modern web apps
- Firebase Auth — easiest if you’re already in the Google ecosystem
- Supabase Auth — best if you already use Supabase
Quick recommendations by use case
- Startup SaaS, fastest to ship: Clerk
- B2B SaaS with enterprise SSO: WorkOS + your auth layer
- Already on Firebase: Firebase Auth
- Already on Supabase: Supabase Auth
- Need self-hosted and control: Keycloak or FusionAuth
- Need low-level flexibility: Ory
Things to compare before choosing
- Social login support
- Passwordless / magic link
- MFA
- SSO/SAML/OIDC
- SCIM provisioning
- Roles and organizations
- Hosted UI vs custom UI
- Multi-tenant support
- Pricing at scale
- Ability to migrate users from Auth0
If you want, I can also give you:
- a comparison table,
- the best choice for your stack (React/Next.js, Rails, Django, etc.), or
- a migration path from Auth0 to another provider.
Observation history
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