Google Firebase Authentication vs Supabase Identity & Authentication Auth

Google Firebase Authentication vs Supabase Identity & Authentication Specs
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Google Firebase Authentication

MFA Support
SMS Phone Verification exclusively on upgraded infrastructure tiers
Enterprise SSO SAML
Supported through Google Cloud Identity Platform integration layer
Custom Domain Support
Included naturally through standard Firebase Hosting custom routes
Supported SDKs
Android, iOS, C++, Unity, Web JS, Node.js, Python, Go, Java
Social Providers
Google, Facebook, GitHub, Twitter, Yahoo, Microsoft, Apple
Compliance Standards
SOC1/2/3, ISO 27001, ISO 27017, HIPAA Compliant, GDPR Compliant
Webhook Fallback Policy
Custom event handling configured via Cloud Functions background retry logic

Supabase Identity & Authentication

MFA Support
TOTP, WebAuthn, Phone SMS
Enterprise SSO SAML
Available on Pro & Enterprise tiers via custom identity mapping
Custom Domain Support
Available on Pro Tier ($20/mo) with full SSL configuration
Supported SDKs
Next.js, React, Vue, Svelte, Node, Python, Go, Flutter, Swift
Social Providers
Google, GitHub, Apple, Discord, GitLab, Bitbucket, Twitter
Compliance Standards
SOC2 Type II, GDPR, HIPAA Compliant (with BAA agreement)
Webhook Fallback Policy
Exponential backoff up to 24 hours with automatic failure truncation