Auth0 API alternatives

Easy to implement, adaptable authentication and authorization platform. If it doesn't fit your project, here are the 6 best free Authentication & Authorization APIs to use instead in 2026, out of 6 in the directory.

For reference, Auth0 API: Callable from the browser (CORS) · HTTPS.

1. 1

   MojoAuth API

   Online · 643 ms

   Secure and modern passwordless authentication platform.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
2. 2W

   Warrant API

   Online · 926 ms

   APIs for authorization and access control.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
3. 3

   GetOTP API

   Online · 674 ms

   With just a simple API call, you can implement your one time password verification flow without worrying about retry or multiple verification channel logic.

   • HTTPS

   apiKeyHTTPSNo CORS
4. 4

   Stytch API

   Online · 1903 ms

   User infrastructure for modern applications.

   • HTTPS

   apiKeyHTTPSNo CORS
5. 5S

   SAWO Labs API

   Last check failed

   Simplify login and improve user experience by integrating passwordless authentication in your app.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
6. 6

   Micro User Service API

   Last check failed

   User management and authentication. A free authentication & authorization API by m3o.com.

   • HTTPS

   apiKeyHTTPSNo CORS

Auth0 API vs alternatives

Auth0 API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
Auth0	Required	Yes	Yes	Up	583 ms	Not rated
MojoAuth	Required	Yes	Yes	Up	643 ms	Not rated
WWarrant	Required	Yes	Yes	Up	926 ms	Not rated
GetOTP	Required	Yes	No	Up	674 ms	Not rated
Stytch	Required	Yes	No	Up	1903 ms	Not rated
SSAWO Labs	Required	Yes	Yes	Down	–	Not rated
Micro User Service	Required	Yes	No	Down	–	Not rated

See also: best Authentication & Authorization APIs · all Authentication & Authorization APIs