Auth0
Free plan ($0): login and user authentication for up to 25,000 monthly active users.
Dev Tools
What you get
Authentication with passwordless, social logins and passkeys for up to 25,000 monthly active users.
How to get it
Sign up on auth0.com/pricing.
What it requires
No credit card required.
The catch
Logs are kept 1 day, MFA beyond basics and role management are paid, and a custom domain needs card verification.
From the official page · checked Oct 22, 2026