Clerk vs Firebase Authentication: Full Comparison (2026)
Pricing, features, scores, and a clear verdict on which one is right for you.
The bottom line
Clerk positions itself as "authentication built for modern react and next.js apps" while Firebase Authentication goes after "google-backed auth with generous free tier for mobile and web" — so the right pick depends on which problem you're actually solving. Firebase Authentication (founded 2011) has had more time to build out its ecosystem and integrations, while Clerk (2021) tends to move faster on modern UX and newer workflows.
At a glance
| Clerk | Firebase Authentication | |
|---|---|---|
| Our score | 85/100 | 76/100 |
| Starting price | Free | Free |
| Free tier | Yes | Yes |
| Best for | Authentication built for modern React and Next.js apps | Google-backed auth with generous free tier for mobile and web |
Pricing comparison
Firebase Authentication
Pricing verified 2026-04-16
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Feature comparison
core
| Feature | Clerk | Firebase Authentication |
|---|---|---|
| Pre-built UI components | Yes | No |
| OAuth / OIDC | Yes | No |
| Social login | Yes | No |
| MFA | Yes | No |
| Passkeys | Yes | No |
| Email/password | No | Yes |
| Google OAuth | No | Yes |
| Apple OAuth | No | Yes |
| Phone SMS | No | Yes |
| Anonymous auth | No | Yes |
advanced
| Feature | Clerk | Firebase Authentication |
|---|---|---|
| Organizations | Yes | No |
| Roles & permissions | Pro+ | No |
| SAML SSO | Enterprise | Blaze ($0.015/MAU) |
| SCIM | Enterprise | No |
| Session management | Yes | No |
| Multi-tenancy | No | Blaze |
| Custom claims | No | Yes |
| App Check | No | Yes |
| Blocking functions | No | Yes |
integrations
| Feature | Clerk | Firebase Authentication |
|---|---|---|
| Next.js | Yes | No |
| React | Yes | No |
| Remix | Yes | No |
| Astro | Yes | No |
| Supabase | Yes | No |
| Convex | Yes | No |
| Firebase (all products) | No | Yes |
| Google Cloud | No | Yes |
| Flutter | No | Yes |
| Android/iOS SDKs | No | Yes |
| Web SDK | No | Yes |
Ratings breakdown
What the data tells us
Key capabilities you'd miss
Choosing Clerk means going without Email/password, Google OAuth, Apple OAuth (which Firebase Authentication offers). Choosing Firebase Authentication means losing Pre-built UI components, OAuth / OIDC, Social login. These are the features that typically drive the final decision — check whether your workflow depends on any of them before committing.
What company size tells you
Clerk (51-200 employees) has the engineering bench to ship features across many fronts but may iterate slower on individual requests. Firebase Authentication (100,000+ employees) typically ships faster on its core product but may lag on peripheral features. Consider which matters more for your roadmap.
Choose Clerk if...
- You want a free tier to get started
- You value an intuitive, easy-to-use interface
- Getting strong value for money is a priority
Choose Firebase Authentication if...
- You want a free tier to get started
- You value an intuitive, easy-to-use interface
- Getting strong value for money is a priority
Frequently asked questions
Is Clerk or Firebase Authentication better?
Clerk scores 85/100 compared to Firebase Authentication's 76/100 on VendorVS. However, the best choice depends on your needs — Clerk excels at ease of use (10/10) while Firebase Authentication scores 8/10.
How much does Clerk cost compared to Firebase Authentication?
Clerk starts at free (free tier available). Firebase Authentication starts at free (free tier available). Clerk is the more affordable option.
Does Clerk or Firebase Authentication have a free plan?
Yes, both Clerk and Firebase Authentication offer free tiers, so you can try each before committing to a paid plan.
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