Can I use a third-party authentication provider and Supabase Auth in the same project?
Yes. You can use a third-party authentication provider alongside Supabase Auth, or on its own. Supabase Auth stays enabled in every project, but your users do not need to sign in with it.
These third-party providers can then access Supabase features (like the Data API (REST and GraphQL), Storage, Realtime and Edge functions) from your existing apps.
For more details how this affects pricing, refer to Manage Monthly Active Third-Party Users usage.