Prompt
I'm building with React and need an auth SDK, what should I use?
Latest observation
Oct 6, 2026
OpenAI APIWeb search: off
It depends on what kind of app you’re building and how much auth you want to manage yourself. For most React apps, these are the usual best choices:
Best general-purpose picks
- Auth0 — very popular, easy to integrate, good docs, works well for enterprise-style apps.
- Clerk — very developer-friendly, great React/Next.js experience, nice prebuilt UI.
- Firebase Auth — good if you’re already using Firebase/GCP and want a simpler backend-managed setup.
If you want maximum control
- Supabase Auth — good if you’re using Supabase/Postgres and want a more open stack.
- NextAuth.js / Auth.js — best if you’re building with Next.js and want flexible OAuth/session handling.
Quick recommendations
- Need fastest setup in React: Clerk
- Using Next.js: Auth.js
- Already on Firebase: Firebase Auth
- Need enterprise features / SSO: Auth0
- Want open-source + self-host-ish stack: Supabase Auth
What to consider
- Social login vs email/password
- MFA / passkeys
- SSO/SAML
- Hosted UI vs fully custom UI
- Pricing as you scale
- React-only or React + backend
If you tell me:
- React or Next.js
- B2C or B2B
- Need social login / SSO / MFA?
- Preferred backend (if any)
…I can give you a very specific recommendation.