Auth0 vs Firebase Auth: Feature Comparison | TechStackVS

Auth0 vs Firebase Auth

Secure access for everyone, but not just anyone

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Simple and free multi-platform sign-in for your apps

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At a Glance

Attribute	Auth0	Firebase Auth
Category	Authentication	Authentication
Pricing Model	freemium	freemium
Starting Price	Free / $23/mo	Free
Free Tier	Yes	Yes
Open Source	No	No
Platforms	web, mobile, api	—

Community Popularity

Auth0

82

Firebase Auth

75

Key Features

Auth0

universal login
social connections
SSO/SAML
MFA
passwordless
user management
Actions extensibility

Firebase Auth

No features listed.

Pros & Cons

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
Every social provider, SAML IdP, and enterprise connection you could need is supported and well documented+128
Organizations feature handles multi-tenancy with per-org branding and connection settings which is essential for B2B+117

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

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