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Synq and Auth.js (NextAuth).
Auth.js, formerly NextAuth.js, is an open-source authentication library that runs inside your own app and works with many frameworks.
Checked against Auth.js (NextAuth)’s own pages on 4 October 2026. Sources are linked below each claim.
Auth.js (NextAuth)
What Auth.js (NextAuth) says it does
- Auth.js describes itself as a runtime-agnostic library based on standard Web APIs that integrates with several JavaScript frameworks. Source: Auth.js: getting started
Synq
Where Synq differs
- Synq is a hosted OpenID Connect issuer: several apps, services and agents share one sign-in and one set of users.
- Users, sessions, keys, rate limits, email and the audit log are run for you.
- Wallet, passkey, email and social sign-in are built, with a management API and webhooks.
Choose Auth.js (NextAuth) if
You have one app, want the code and the data in your own hands, and are glad to run sessions and email yourself.
Choose Synq if
Several apps, a mobile app or agents need the same users, or you would rather not run identity yourself.
Weighing Synq for your product?
Tell us what you use today and what you need, and we will tell you honestly whether Synq fits. Synq is pre-launch.