Auth.js (NextAuth.js)
Work on Auth.js (NextAuth.js)? Verify this listing (free)The classic open-source auth library for Next.js, now part of Better Auth
Free, open-source (ISC) auth library behind next-auth (~28k GitHub stars), with OAuth providers, email sign-in and adapters for Next.js, SvelteKit, Express and Qwik. The project is now part of Better Auth, which is the recommended path for new apps.
Best for: Existing Next.js apps already on next-auth; new projects should look at Better Auth first
Visit Auth.js (NextAuth.js) ↗- Pricing
- Free (ISC open source); you host it and pay only for your own database
- Free tier
- Yes: fully free and open source, no per-user fees
- Open source
- Yes
- Last verified
- 2026-10-24
Auth.js (NextAuth.js) pricing breakdown, history and cheaper alternatives →
Sources (checked 2026-10-24): authjs.dev · github.com/nextauthjs/next-auth
Score breakdown
- Fit for the use case19 / 25
- Vibe-coder friendliness8 / 15
- Output quality & reliability11 / 15
- Pricing & free tier15 / 15
- Ecosystem & integrations8 / 10
- Momentum2 / 10
- Code ownership & lock-in10 / 10
Why this score: Free, owned and still widely used, and coding agents know it well. But the project now lives under Better Auth, so momentum has moved there; pick Better Auth for new builds.
Based on desk research of official pricing pages and docs; see methodology.
FAQ
- Is Auth.js (NextAuth.js) free?
- Auth.js (NextAuth.js) free tier: Yes: fully free and open source, no per-user fees. Paid pricing: Free (ISC open source); you host it and pay only for your own database.
- What is Auth.js (NextAuth.js) pricing in 2026?
- Auth.js (NextAuth.js) pricing (as of our last verification on 2026-10-24): Free (ISC open source); you host it and pay only for your own database. Always confirm on the official site — plans change.
- Is Auth.js (NextAuth.js) open source?
- Yes. Auth.js (NextAuth.js) is open source.
- What is Auth.js (NextAuth.js)'s PromptToProd score?
- Auth.js (NextAuth.js) scores 73/100 on PromptToProd (fit, vibe-coder friendliness, quality, pricing, ecosystem, momentum, ownership). See the score breakdown on this page and our methodology.
- What is Auth.js (NextAuth.js) best for?
- Auth.js (NextAuth.js) is best for: Existing Next.js apps already on next-auth; new projects should look at Better Auth first.
- When was Auth.js (NextAuth.js) last verified on PromptToProd?
- Pricing and details for Auth.js (NextAuth.js) were last verified on 2026-10-24 from official docs and pricing pages.
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