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What is the best way to add authentication to an app?

Use a managed provider. Session handling, token refresh, and account recovery are where hand-rolled auth breaks, and an agent writing it from scratch will produce something that works and is quietly unsafe.

Surveyed 17 September 2026

Add authentication

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No.Tool
  1. 01
    Clerk

    Drop-in authentication and user management covering sign-up, sign-in, profiles, and organizations.

    Developer Tools
  2. 02
    Auth0

    Identity platform providing social login, enterprise SSO, multi-factor auth, and authorization as a service.

    Developer Tools
  3. 03
    Supabase Auth

    Postgres-backed authentication for Supabase with email, social login, magic links, phone sign-in, and SSO.

    Developer Tools
  4. 04
    Auth.js

    Open-source, framework-agnostic authentication library for the web, formerly known as NextAuth.

    Developer Tools
  5. 05
    WorkOS

    B2B auth platform providing enterprise SSO, SCIM directory sync, OIDC, magic auth, and audit logs.

    Developer Tools
  6. 06
    Firebase Auth

    Authentication built into Firebase, covering email/password, social, phone, and anonymous sign-in.

    Developer Tools
  7. 07
    Better Auth

    Framework-agnostic TypeScript auth library with bring-your-own-database adapters for Drizzle, Prisma, and Kysely.

    Developer Tools
  8. 08
    AWS Cognito

    AWS-native auth with user pools, identity pools, and social and enterprise federation, tied into IAM.

    Developer Tools
  9. 09
    Microsoft Entra ID

    Microsoft's identity platform, formerly Azure AD, covering SSO, MFA, conditional access, and external identities.

    Developer Tools

A curated selection in editorial order. Use the fit and evidence to judge it for your task. Something missing?

What to look for

  • 01Does it hand you a verified session server-side, or only a client-side token you must validate yourself?
  • 02Does it cover recovery, email change, and session revocation? Those are most of the real work.
  • 03Does authorization integrate with your database's access rules, or sit beside them?

Common questions

Should I let an AI agent write authentication from scratch?
No. It will produce something that logs users in and is subtly wrong — token validation on the client only, sessions that never revoke, redirects that can be pointed anywhere. Use a provider.
What is the most common auth bug in generated code?
Trusting a client-supplied user ID instead of the server-verified session, which lets any authenticated user act as any other by changing one value in the request.

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