Firebase Auth vs Auth0

At a Glance

Firebase Auth

Auth0

Firebase Auth

No features listed.

Auth0

Firebase Auth

No data available.

Auth0

Pros

Battle-tested enterprise auth with every compliance certification you'd need to close enterprise deals (SOC2, HIPAA, etc.)+163
The rules and actions pipeline lets you add custom logic to every auth step — useful for things like provisioning users in your database on first login+141

Authentication

Supabase Auth vs Firebase Auth

Authentication

Clerk vs Auth0

Authentication

Clerk vs Auth0 vs WorkOS

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Cons

Pricing is confusing and the free tier limit of 7,500 MAU sounds generous until you hit it and face a $23/mo minimum with rapid escalation at scale+178
The dashboard UX is notoriously complex — simple tasks like finding where to add a social connection take 10 minutes the first time+154
Tenant architecture means your dev, staging, and prod environments are separate tenants that can't share configuration without manual duplication+112
Log retention on the free tier is only 2 days which makes debugging user auth issues that happened last week impossible+89