Best Authentication & Identity APIs in 2026

Open-source auth with row-level security tied to PostgreSQL.

Google-backed auth for mobile and web with social login support.

User sign-up, sign-in, and access control for AWS apps.

Authentication, authorisation, and user management for apps.

Enterprise identity management, SSO, and MFA.

Drop-in auth components with user management and session handling.

Google sign-in and OAuth 2.0 authorisation for apps.

Sign in with Apple for web and mobile apps.

Phone verification via SMS, voice, email, and TOTP.

Protect sites from spam and abuse with CAPTCHA challenges.

Privacy-preserving CAPTCHA alternative from Cloudflare.