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Ranked by how many scanned sites use each. Once we see sites drop Firebase Authentication, where they go next ranks first.
Sign-in backend and client SDKs that come with Google's Firebase app platform.
Growth is sites that added it minus confirmed removals in the last 90 days.
Google's social sign-in for websites, as a button or a One Tap prompt.
TypeScript authentication framework, MIT licensed and extended through plugins.
Authentication service built into the Supabase backend platform, with client SDKs, API endpoints and an MIT-licensed server.
Open source authentication library for JavaScript frameworks, kept in maintenance mode by the Better Auth team.
Hosted authentication and user management that Clerk describes as a complete user layer for apps.
Deprecated Google sign-in script for websites, superseded by Google Identity Services.
Okta's customer identity product, with attack protection that grows by plan.
Social sign-in service that can hand the developer an Apple-generated address in place of the person's real email.