🔐 Authentication Comparison
Firebase Auth vs Stytch
A detailed comparison to help you choose the right tool for your needs.
Last updated: 2026-02-06
Firebase Auth
Free up to 50k MAU (phone auth: 10k/mo free)
Strengths
- + 50,000 monthly active users free — most solo products never hit that ceiling
- + Google, Apple, GitHub, and 10+ social providers work out of the box
- + Plugs directly into Firestore, Cloud Functions, and other Google Cloud services
Weaknesses
- − Tied to the Google ecosystem — using Firebase Auth without other Firebase services feels awkward
- − Custom UI required — no pre-built login components like Clerk offers
- − Migrating user password hashes out of Firebase is possible but painful
Stytch
Free up to 25 orgs or 1k MAU, from $99/mo
Strengths
- + Purpose-built for passwordless — magic links, OTPs, passkeys, and biometrics
- + Fraud detection (device fingerprinting, bot detection) included in the platform
- + Clean API design with SDKs for React, Next.js, Python, Go, and more
Weaknesses
- − Paid plans start at $99/mo — expensive compared to Clerk ($25/mo) and Auth0 ($23/mo)
- − Smaller ecosystem and community than established auth providers
- − Traditional email/password auth feels like an afterthought
The verdict
Which one is right for you?
Choose Firebase Auth if you want
- → 50,000 monthly active users free — most solo products never hit that ceiling
- → Google, Apple, GitHub, and 10+ social providers work out of the box
Choose Stytch if you want
- → Purpose-built for passwordless — magic links, OTPs, passkeys, and biometrics
- → Fraud detection (device fingerprinting, bot detection) included in the platform
In depth
About each tool
Firebase Auth
Google's authentication service with generous free limits and tight integration across the Firebase ecosystem
Firebase Auth handles email/password, social login, phone auth, and anonymous users with minimal setup. Google gives you 50,000 MAU free for most auth methods, which is five times what Clerk or Auth0 offer. If you are already using Firestore or Cloud Functions, Auth plugs in with a single line of config.
The downside is that Firebase Auth is designed to keep you inside Google’s ecosystem. Using it as a standalone auth service — say, with a Postgres database and a Next.js app on Vercel — is doable but clunky compared to Clerk or Supabase Auth. You also need to build your own login UI, since Firebase only provides a basic drop-in widget (FirebaseUI) that looks dated. For solo founders already committed to Firebase, Auth is the obvious choice. For everyone else, evaluate whether you want that Google dependency.
Stytch
Passwordless authentication API focused on magic links, OTPs, and passkeys
Stytch is built around the idea that passwords are a liability. Instead of email/password as the default, it leads with magic links, one-time passcodes, passkeys, and biometric auth. The API is well-designed — you can have passwordless login working in under an hour. It also bundles device fingerprinting and bot detection, which most competitors charge extra for or do not offer.
The catch is pricing. The free tier covers 1,000 MAU or 25 organizations, but the jump to paid is $99/month — steep for a solo founder who just needs basic auth. If your product specifically benefits from passwordless (fewer support tickets, higher conversion on sign-up), Stytch pays for itself. If you just need standard social login and email/password, Clerk or Firebase Auth give you more MAU for less money.
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