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Free Auth MAU Limits Compared
How many monthly active users each hosted login and auth service lets you have for free, largest first, and the catch that comes with it. Every row links to the dated listing and the vendor's own pricing page. Last checked .
| Service | Free MAU allowance | Catch | Checked |
|---|---|---|---|
| WorkOS AuthKit | First 1 million active users | SSO and directory sync priced separately | source |
| Clerk (Hobby) | 50,000 monthly retained users per app | Up to 3 social connections, no MFA or passkeys on Hobby | source |
| Firebase Authentication | 50,000 MAU (50 SAML/OIDC MAU) | Phone auth billed per SMS | source |
| Logto Cloud (Free) | 50,000 MAU, 50,000 access tokens a month | No MFA, organizations or enterprise SSO on Free | source |
| Auth0 (Free) | 25,000 MAU | 1 enterprise connection, 5 organizations | source |
| Kinde (Free) | 10,500 MAU | 0.7% fee if you bill customers through Kinde | source |
| Stytch | 10,000 MAU (users + AI agents) | 5 SSO/SCIM connections, 1,000 M2M tokens | source |
FAQ
Which auth provider has the biggest free tier?
By monthly active users, WorkOS AuthKit (first 1 million free), then Clerk, Firebase Authentication and Logto Cloud at 50,000, Auth0 at 25,000, Kinde at 10,500 and Stytch at 10,000. Limits are copied from each vendor's pricing page and dated.
Is MFA included in free auth plans?
Not always. Clerk Hobby has no MFA or passkeys and Logto Free has no MFA (both are paid upgrades), while Kinde includes MFA on its free plan. Check the catch column before you pick one.
What counts as a monthly active user?
Usually any user who signs in or refreshes a session during the month. Clerk counts retained users (people who come back at least a day after signing up), and Stytch counts AI agents as well as people.
See also: Auth · Firebase Free Tier · Free Tier Fine Print