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Alternatives

Best Firebase Authentication Alternatives in 2026

Firebase Auth is easy to start with. These six options fit when you want out of the Google Cloud ecosystem, need more server-side control, or want messaging handled by the same platform.

dev@zyphr:~/zyphr$
// Why teams look for alternatives
  • Moving off Firebase or Google Cloud and not wanting auth to be the thing that keeps you there.
  • Wanting more server-side control: custom claims, session policy, organizations and admin tooling without Cloud Functions workarounds.
  • B2B features such as multi-tenancy and SAML that require upgrading to Identity Platform.
  • Still needing a separate vendor for transactional email, SMS and webhooks.
dev@zyphr:~/zyphr$
// Quick picks
#OptionBest for
1ZyphrLeaving Firebase without losing mobile sign-in or push
2Supabase AuthThe closest like-for-like move: a full backend platform on Postgres
3ClerkWeb apps on React or Next.js
4Auth0Enterprises that need SAML and a mature compliance story
5AWS CognitoTeams moving from Google Cloud to AWS
6AppwriteOpen-source, self-hostable Firebase replacement

Last reviewed November 2026. Check each vendor's pricing page for current prices; they change often.

dev@zyphr:~/zyphr$
// Each option, honestly

1. Zyphr

A complete auth service (passkeys, social sign-in with Google, Apple, Facebook, GitHub and Microsoft, magic links, email and SMS codes, TOTP MFA, organizations (multiple per app from Pro), anonymous auth, RS256 JWTs with a public JWKS), plus the email, push, SMS, in-app and webhook delivery your auth flows need. Every sign-in and security feature is on every plan, 1,000 MAU and 1,000 emails a month free. Push goes over APNs and FCM directly, and native Apple Game Center and Google Play Games sign-in are verified server-side.

best for
Leaving Firebase without losing mobile sign-in or push
watch out
No SAML, enterprise OIDC or SCIM yet, and MFA is TOTP with backup codes only. Password hashes cannot be imported yet, so password users set a new password once when you switch.

2. Supabase Auth

Open-source auth inside Supabase, which also covers database, storage and functions, so it replaces more of Firebase than auth alone.

best for
The closest like-for-like move: a full backend platform on Postgres
watch out
You are adopting a platform, not just auth; most valuable if you move your database too.

3. Clerk

Prebuilt sign-in and profile components, organizations for B2B, and a polished developer experience on the web.

best for
Web apps on React or Next.js
watch out
Strongest on the web; native iOS and Android SDKs exist, but there is no game-platform sign-in.

4. Auth0

Okta's identity platform with enterprise connections, Actions, and a broad integration catalog.

best for
Enterprises that need SAML and a mature compliance story
watch out
Paid plans are billed per MAU and self-serve plans are capped, so cost rises quickly once you leave the free tier.

5. AWS Cognito

AWS-native user pools with federation and IAM integration.

best for
Teams moving from Google Cloud to AWS
watch out
Developer experience is a common complaint, and password hashes cannot be exported later.

6. Appwrite

Open-source backend platform with auth, databases, storage, functions and messaging, available as a cloud service or self-hosted.

best for
Open-source, self-hostable Firebase replacement
watch out
Like Supabase, it is a whole platform; self-hosting means running it yourself.
dev@zyphr:~/zyphr$
// Frequently asked questions
What is the best Firebase Authentication alternative?

If you only want to replace auth and keep mobile push and transactional messaging in one place, Zyphr (1,000 MAU and 1,000 emails a month free). To replace most of Firebase at once, Supabase or Appwrite. For React web apps with prebuilt UI, Clerk.

Can I move Firebase users without password resets?

Firebase exports password hashes with a modified scrypt algorithm (users imported with another algorithm export without a hash until they sign in again), and only some providers can import them. Zyphr cannot import password hashes yet, so password users set a new password once; social and passwordless users are unaffected.

Which alternative supports Game Center and Play Games sign-in?

Firebase supports both, and so does Zyphr, which verifies Apple Game Center and Google Play Games identities server-side with no email, password or OAuth redirect.

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// Get started

Auth, push and email, one API

1,000 MAU and 1,000 emails a month free. No credit card.