authjs-vs-better-auth.html

Auth.js (NextAuth) vs Better Auth — which auth service wins for your brief, in 2026

Two auth services, side by side. Auth.js (NextAuth) is open-source library for next.js, sveltekit, solidstart. free, self-managed user database. Better Auth is newer typescript-first oss auth library. designed as the modern auth.js alternative. The verdict, the criteria, and the honest take below.

ALL AUTH COMPARISONS →

Verdict in one paragraph

Established vs newer. Auth.js has 8 years of inertia, the bigger community, and the Next.js-default reputation. Better Auth has a cleaner API, multi-tenant primitives, and TypeScript-first design. For greenfield projects in 2026, Better Auth is increasingly the right pick. For teams with existing Auth.js deployments or strong Auth.js muscle memory, the migration cost may not be worth it yet.

Score across the criteria: Auth.js (NextAuth) 2 · Better Auth 4

Side by side

Auth.js (NextAuth)
Better Auth
Category
Library / OSS
Library / OSS
Language
TypeScript
TypeScript
Pricing
Open source
Open source
License
ISC
MIT
Created
2016
2024
GitHub stars
26.4k
18.4k
HIPAA
No
No
SSO/SAML
Limited
Yes

Decision criteria

  • Which has the bigger community?

    Auth.js (NextAuth)

    26k+ GitHub stars, 8 years of accumulated answers and integrations. Better Auth has 18k stars but a fraction of the cumulative knowledge.

  • Which has the cleaner API?

    Better Auth

    Better Auth was designed with hindsight on Auth.js's pain points. The API is meaningfully cleaner.

  • Which has better multi-tenant primitives?

    Better Auth

    Organisations + members + permissions are first-class in Better Auth. Auth.js handles this awkwardly.

  • Which is the right pick for a greenfield project?

    Better Auth

    For new projects, Better Auth is increasingly the sharper choice in 2026.

  • Which is the right pick for a stable existing deployment?

    Auth.js (NextAuth)

    Migration cost from Auth.js to Better Auth is real. Stable deployments do not need to migrate yet.

  • Which has more recent feature work?

    Better Auth

    Better Auth ships features at a faster pace in 2026.

What Auth.js (NextAuth) is best for

  • Next.js / SvelteKit / SolidStart teams that want zero auth bill
  • Apps where owning the user database is the priority
  • Projects with simple auth needs (social login + email)

Read the full Auth.js (NextAuth) entry: /authentication/authjs/

What Better Auth is best for

  • Greenfield TypeScript projects that want a modern OSS auth library
  • Teams comparing against Auth.js and finding the abstractions awkward
  • Multi-tenant briefs where Auth.js feels constrained

Read the full Better Auth entry: /authentication/better-auth/

The auth choice is the easy half — your migration is the hard one

The hard half is migrating user accounts off the old stack without breaking sessions, getting your team adopted, and surviving the SOC2 / HIPAA audit conversations. The 30-min call covers all three for your specific project — describe your stack, your scale, your compliance constraints; I tell you whether Auth.js (NextAuth) or Better Auth (or something else) is your fit.