Authentication APIs Terms Comparison
Side-by-side comparison of free tiers, rate limits, and usage restrictions for 4 authentication apis.
Terms of service may change. Always verify with the official API documentation before building production applications.
| API | Free Tier | Rate Limit | Commercial | Attribution | Auth | CORS | Caching | Notable Restrictions |
|---|---|---|---|---|---|---|---|---|
| Auth0 | 7,500 MAU, unlimited logins | Varies by endpoint and plan | ✓ | Req | OAuth2 / API Key (Management API) | Yes | Yes | Free plan: 7,500 active users, 2 social connections, no custom domains |
| Stytch | 10,000 MAU | Verify on official docs | ✓ | No | API Key + Secret (header) | Yes | Yes | Free plan: limited to 10,000 monthly active users |
| MojoAuth | 1,000 MAU | Verify on official docs | ✓ | No | API Key (header) | Yes | Yes | Passwordless authentication only (email magic link, WebAuthn) |
| SAWO Labs | Unlimited (beta/community plan) | Verify on official docs | ✓ | Req | API Key (SDK integration) | Yes | Yes | Passwordless only; limited customization on free plan |
Attribution Details
Auth0: Auth0 badge required on free plan login pages
SAWO Labs: SAWO branding on free plan login widget
Last updated: 2026-04