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Stytch

Authentication APIs for consumer and for B2B.

What it is

Focused on passwordless authentication: magic links, OTP by SMS or email, passkeys and biometrics, plus a B2B product with organisations and SSO. It offers SDKs and also raw APIs if you would rather build your own interface.

Best for

Passwordless login with full control of the design.

What the free plan includes

  • 10,000 active users on the consumer product
  • 1,000 active users on the B2B product
  • Passkeys and magic links included

Free plans change often. Confirm the limits on the official page before deciding.

Kinde

Authentication and access control by feature.

Free plan up to 10,500 active users

Clerk

Pick

Authentication with ready-made interface components.

Free plan up to 50,000 monthly active users

Auth0

Hosted identity with social login and SSO.

Free plan up to 25,000 monthly active users