Better Auth vs Auth.js (NextAuth.js) (2026)
Head-to-head comparison for vibe coders: scores, free tiers, pricing and best-for, using the same evidence-based methodology. Rankings are never for sale.
Open-source TypeScript auth framework
The classic open-source auth library for Next.js, now part of Better Auth
Side-by-side comparison
| Criterion | Better Auth | Auth.js (NextAuth.js) |
|---|---|---|
| Score | 86/100 | 73/100 |
| Free tier | Yes: MIT library free to self-host; Infrastructure Starter $0 | Yes: fully free and open source, no per-user fees |
| Open source | Yes | Yes |
| Pricing | Library free; optional Infrastructure Pro $20/mo | Free (ISC open source); you host it and pay only for your own database |
| Best for | Owning auth in your own database with no per-user fees | Existing Next.js apps already on next-auth; new projects should look at Better Auth first |
| Category | Auth | Auth |
Score breakdown
| Criterion | Better Auth | Auth.js (NextAuth.js) |
|---|---|---|
| Fit for the use case /25 | 22 | 19 |
| Vibe-coder friendliness /15 | 10 | 8 |
| Output quality & reliability /15 | 12 | 11 |
| Pricing & free tier /15 | 15 | 15 |
| Ecosystem & integrations /10 | 8 | 8 |
| Momentum /10 | 9 | 2 |
| Code ownership & lock-in /10 | 10 | 10 |
Based on desk research of official pricing pages and docs; see methodology.
Who wins: Better Auth or Auth.js (NextAuth.js)?
By score, Better Auth wins Better Auth vs Auth.js (NextAuth.js) at 86/100 vs 73/100. Better Auth: Free, no lock-in and fast-growing. Needs more setup than hosted Clerk. Auth.js (NextAuth.js): 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. Better Auth is best for Owning auth in your own database with no per-user fees. Auth.js (NextAuth.js) is best for Existing Next.js apps already on next-auth; new projects should look at Better Auth first.
FAQ
- Which is better, Better Auth or Auth.js (NextAuth.js)?
- By our score, Better Auth (86/100) ranks above Auth.js (NextAuth.js) (73/100). Better Auth is best for Owning auth in your own database with no per-user fees. The right pick still depends on your workflow; see the side-by-side table.
- What is the Better Auth vs Auth.js (NextAuth.js) score?
- Better Auth scores 86/100 and Auth.js (NextAuth.js) scores 73/100 on PromptToProd's evidence-based ranking. Scores are never for sale.