Authentication · October 2026
Auth.js (NextAuth) vs Firebase Auth: which do AI models pick?
Auth.js (NextAuth) leads on being recommended first (6% vs 0%). Auth.js (NextAuth) leads on being installed in AI-built apps (35% vs 3%).
Auth.js (NextAuth)Firebase Auth
| Auth.js (NextAuth) | Firebase Auth | |
|---|---|---|
| Rank among authentication tools recommended first | #4 of 6 | not ranked |
| Rank in AI-built apps | #2 of 6 | #4 of 6 |
| More detail | Auth.js (NextAuth) page | Firebase Auth page |
Based on 180 recommendation answers and 179 AI-built apps. Differences under about 7 points are within noise.
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Measured 2026-10-01 with claude-sonnet-5.5, gpt-6.1-sol, gemini-3.8-flash, grok-4.7, deepseek-v4.1-flash, qwen3.8-max-prime, 5 runs per recommendation prompt and 5 per build prompt, via public APIs with no system prompt. Methodology. DefaultRank is independent and not affiliated with any tool vendor or model provider.