Auth.js vs Firebase Authentication

Learn how Auth.js and Firebase Authentication differ in their key features like authentication, enterprise auth, security, user management and compliance, so you can decide which of these authentication providers is best for you.

Auth.js

Secure authentication for modern web applications

Visit Auth.js Read more

Details:

B2B
No
B2C
Yes
Open Source
Yes
Self-hosted
Yes

View Repository

Firebase Authentication

Secure multi-platform authentication in under 10 lines

Visit Firebase Authentication Read more

Details:

B2B
Yes
B2C
Yes
Open Source
No
Self-hosted
No

Feature Comparison

Firebase Authentication offers broader feature coverage than Auth.js, supporting 22 features compared to 15. Firebase Authentication fully covers branding.

Passwordless Authentication

Auth.js

Firebase Authentication

Social Connections

Auth.js

Auth.js comes with over 80 preconfigured OAuth providers (Google, GitHub, Twitter, Facebook, etc.) so users can sign in with existing accounts

Firebase Authentication

Passkeys

Auth.js

Firebase Authentication

Long Lived Sessions

Auth.js

Session settings allow adjusting `session.maxAge` and `updateAge` to control how long sessions last; default expiry is 30 days but can be configured for longer durations

Firebase Authentication

Session Management

Auth.js

Firebase Authentication

Multi-Language

Auth.js

Firebase Authentication

Email templates and FirebaseUI can be localized; set the language with a `languageCode` property or override CSS for more than 40 languages

	Auth.js	Firebase Authentication
Passwordless Authentication
Social Connections	Auth.js comes with over 80 preconfigured OAuth providers (Google, GitHub, Twitter, Facebook, etc.) so users can sign in with existing accounts
Passkeys
Long Lived Sessions	Session settings allow adjusting `session.maxAge` and `updateAge` to control how long sessions last; default expiry is 30 days but can be configured for longer durations
Session Management
Multi-Language		Email templates and FirebaseUI can be localized; set the language with a `languageCode` property or override CSS for more than 40 languages

Compliance Comparison

Firebase Authentication offers significantly broader coverage than Auth.js, supporting 6 certifications and regulatory frameworks compared to 0 for Auth.js. Since Auth.js is open source and does not include compliance certifications, you’ll need to manage compliance yourself.