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.
Where these values come from
CORS is verified by us — we read the Access-Control-Allow-Origin header from a real response (last checked 2026-07-31). Free tier and restrictions marked verified were read from the provider's own pricing page on the date shown, and that page is linked so you can re-check it yourself. Rows marked not verified are ones we could not confirm at the source, so we do not publish a number for them. Pricing and licence terms change without notice — confirm with the provider before you commit. If you spot a value that is out of date, tell us and we will correct it.
Discontinued
One API in this table no longer responds: SAWO Labs. Their terms are kept for reference, but you cannot sign up for them.
| API | Free Tier | Rate Limit | Commercial | Attribution | Auth | CORS | Caching | Notable Restrictions |
|---|---|---|---|---|---|---|---|---|
| Auth0 | 25,000 MAU verified 2026-08-01 | Varies by endpoint and plan | ✓ | Req | OAuth2 / API Key (Management API) | Yes | Yes | Free plan: 25,000 MAU, unlimited social connections, 1 enterprise connection, 1 custom domain |
| Stytch | 10,000 MAU verified 2026-08-01 | Verify on official docs | ✓ | No | API Key + Secret (header) | Yes | Yes | Free plan: limited to 10,000 monthly active users |
| MojoAuth | 1,000 MAU verified 2026-08-01 | Verify on official docs | ✓ | No | API Key (header) | Yes | Yes | Passwordless authentication only (email magic link, WebAuthn) |
| SAWO Labs Discontinued | Unlimited (beta/community plan) | Verify on official docs | ✓ | Req | API Key (SDK integration) | Yes | Yes | Passwordless only; limited customization on free plan |
Attribution Details
Last updated: 2026-04