Best Firebase Auth Alternatives (2026)

Firebase Auth is a free auth tool (auth provider). Google auth service with email phone social and anonymous sign-in methods. We found 12 alternatives worth considering.

Quick verdict

Most similar: Clerk
Best free option: Clerk

Why look for Firebase Auth alternatives?

Feature gaps — while Firebase Auth is free, paid alternatives may offer more polish or support.
Workflow fit — every team is different; the best tool depends on your stack and preferences.

Top 12 Alternatives to Firebase Auth

Drop-in authentication with pre-built UI components optimized for React and Next.js

Both Auth Provider auth toolsShared: auth, auth provider

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Supabase Authfree

PostgreSQL-native auth with row-level security and social/email/phone login

Both Auth Provider auth toolsShared: auth, auth provider

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All-in-one auth with built-in orgs RBAC feature flags and billing hooks for SaaS

Both Auth Provider auth toolsShared: auth, auth provider

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Enterprise-grade auth with SSO SCIM MFA and AuthKit UI components

Both Auth Provider auth toolsShared: auth, auth provider

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SuperTokensopen-source

Open-source auth with self-host option pre-built login UI and session management

Both Auth Provider auth toolsShared: auth, auth provider

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Auth.jsopen-source

Framework-agnostic auth library formerly NextAuth.js supporting 80+ providers

Both in AuthShared: auth

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Luciaopen-source

Lightweight session-based auth library for TypeScript with zero dependencies

Both in AuthShared: auth

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ValidatorAIfree

AI startup idea validator used by 200K+ people

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AI market analysis in ~120 seconds for entrepreneurs

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Open-source Firebase alternative with Postgres auth storage realtime and edge functions

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Google full BaaS with Firestore Realtime DB auth hosting and cloud functions

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TypeScript-native reactive database with built-in realtime sync and serverless functions

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Alternatives by type

Auth Library alternatives

Web-Based alternatives

Full BaaS alternatives

Reactive Database alternatives

Frequently asked questions

What are the best alternatives to Firebase Auth?: The top alternatives to Firebase Auth include Clerk, Supabase Auth, Kinde. All are auth tools that support auth provider workflows.
Is there a free alternative to Firebase Auth?: Yes. Clerk is available for free. Drop-in authentication with pre-built UI components optimized for React and Next.js
Is Clerk better than Firebase Auth?: Clerk and Firebase Auth serve similar purposes as auth tools. Clerk: Drop-in authentication with pre-built UI components optimized for React and Next.js Firebase Auth: Google auth service with email phone social and anonymous sign-in methods The best choice depends on your workflow and requirements.
How many alternatives to Firebase Auth are there?: We track 12 alternatives to Firebase Auth across categories including Auth, Idea Validation, Database/BaaS.

Related alternatives pages

Alternatives to Clerk Alternatives to Supabase Auth Alternatives to Auth.js Alternatives to Kinde Alternatives to WorkOS Alternatives to Lucia Alternatives to SuperTokens

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