Supabase Auth
Auth Provider
Auth.js / NextAuth
Auth ProviderSupabase Auth vs Auth.js / NextAuth (2026): Which Is Better?
Supabase Auth and Auth.js / NextAuth are both popular choices, but they serve different needs. Supabase Auth is a Auth Provider with a traditional, manual approach to building, while Auth.js / NextAuth is a Auth Provider that prioritises developer or designer control.
Below you'll find a side-by-side breakdown of detection signals, AI scores, and technical fingerprints — plus our honest take on which builder wins for different use cases.
How we detect Supabase Auth vs Auth.js / NextAuth — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
Side-by-Side Comparison
| | |
|---|---|---|
| Category | Auth Provider | Auth Provider |
| AI Score | 10/100 — Unknown | 10/100 — Unknown |
| Detection Signals | 3 patterns | 2 patterns |
| Script Detection | 1 patterns | — |
| CDN Detection | — | — |
| Header Detection | — | — |
| Sites Detected | No data yet | No data yet |
| Best For | Professional websitesTry Supabase Auth → | Professional websitesTry Auth.js / NextAuth → |
| Official Website | Visit | Visit |
Example Websites
Supabase Auth
Auth Provider
Supabase Auth is a auth provider with an AI Score of 10/100 (Unknown). Our detection engine uses 3 signal patterns to identify Supabase Auth-built sites.
Auth.js / NextAuth
Auth Provider
Auth.js / NextAuth is a auth provider with an AI Score of 10/100 (Unknown). Our detection engine uses 2 signal patterns to identify Auth.js / NextAuth-built sites.
Platform Overviews
Supabase Auth
Supabase Auth is the authentication layer of the Supabase platform (an open-source Firebase alternative built on Postgres), providing email, social-login, and row-level-security-integrated user management for developers who also use Supabase's database and storage products. Our engine detects it through 1 script pattern and 2 HTML patterns tied to the Supabase client SDK's auth-session handling, distinct from — but related to — the signals used to detect Supabase's database product. Supabase can be self-hosted or used via its managed cloud; a detection doesn't distinguish between the two. Documented at supabase.com/auth.
Auth.js / NextAuth
Auth.js (formerly NextAuth.js) is an open-source authentication library built primarily for Next.js and other JavaScript frameworks, letting developers add login (OAuth providers, email, credentials) without a paid third-party identity platform. Our engine detects it through 2 HTML patterns tied to its default sign-in page markup and session-cookie conventions, since as a self-hosted library it doesn't load from an external CDN the way hosted identity platforms do. A detection indicates the site handles its own auth backend using this library rather than outsourcing it. Documented at authjs.dev.
Key Differences
- Both Supabase Auth and Auth.js / NextAuth are classified as Auth Provider tools, making them the most direct competitors in this comparison.
- Supabase Auth scores higher on AI involvement (10/100 vs 10/100 for Auth.js / NextAuth), meaning it relies more heavily on AI for site generation and content creation.
- Our detection engine identifies Supabase Auth using 3 fingerprint patterns and Auth.js / NextAuth using 2 patterns — more signals generally means more reliable detection.
Which Should You Choose?
Choose Supabase Auth if…
- You prefer a auth provider solution
- You want more manual control over the final output
- Supabase Auth's detection fingerprint of 3 signals means your site is reliably identifiable
Choose Auth.js / NextAuth if…
- You need a auth provider approach
- You prefer traditional building tools with predictable output
- Auth.js / NextAuth's ecosystem and community better match your team's existing workflow
Our Pick — Based on our detections
Supabase Auth
The most frequently detected auth provider in our scan database.
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