← All authentication as a service rankings

Auth0 vs Firebase Authentication: which one does AI recommend?

We asked ChatGPT, Gemini and Perplexity 10 questions buyers ask about authentication as a service — 30 answers in total — and counted who got named. Auth0 is named in 19 of 30 answers (63%); Firebase Authentication in 13 (43%).

Auth0

63%

named in 19 of 30 answers

ChatGPT: named in 100% of answers

Gemini: named in 10% of answers

Perplexity: named in 80% of answers

Firebase Authentication

43%

named in 13 of 30 answers

How they rank against everyone else

Clerk

67%

Auth0

63%

Firebase Authentication

43%

WorkOS

40%

Stytch

37%

Supabase Auth

37%

Amazon Cognito

30%

Keycloak

27%

Where does your product land?

Same 10 questions, your product, about a minute. No account.

Counts are mentions in AI answers, not endorsements, measured 2026-09-20. Nobody pays to appear.