About Auth0
Auth0 abstracted authentication into an afternoon’s work: universal login, social providers, MFA, and enterprise SSO through SDKs for every stack. Rules and Actions customize flows without forking security code. Under Okta ownership the free tier expanded to 25,000 monthly users. Costs at scale and per-feature gating remain the chief complaints of graduating startups.
Key Features
- Universal login pages
- Social and enterprise SSO
- MFA and passkeys
- Actions for custom logic
- Organizations for B2B
Pros & Cons
Pros
- Fastest path to solid auth
- SDKs for every framework
- Enterprise SSO connections
- Generous 25k-MAU free tier
Cons
- Pricing escalates with growth
- B2B features gated upward
- Migration off is nontrivial
Frequently Asked Questions
Is Auth0 free?
Yes, up to 25,000 monthly active users with core features.
Auth0 or Supabase Auth?
Supabase suffices for simple apps; Auth0 earns its cost at enterprise SSO complexity.
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Best For
Product teams shipping secure login without becoming identity experts.