Head to head
Clerk vs Firebase Authentication
As a authentication & identity API, Firebase Authentication rates higher on the APIbenchmarks Index, 87.6 to 85.2, a 2.4-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Clerk | Firebase Authentication |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 85.2 | 87.6 |
Specifications
| Clerk | Firebase Authentication | |
|---|---|---|
| Best for | Embeddable auth UI for React/Next.js | Mobile/web auth inside Firebase |
| Free tier | 50k MAU (monthly retained users) | 50k MAU (basic email/social) |
| Pricing | MAU-based | MAU-based (+ per-SMS) |
| Official SDKs | 12 languages | 11 languages |
Is Clerk better than Firebase Authentication?
On the APIbenchmarks Index, Firebase Authentication rates higher (87.6 vs 85.2). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.