
Better Auth has significantly broader feature support than Firebase Authentication, with 33 supported features versus 22. Better Auth fully covers authentication.
Magic link and email OTP plugins allow passwordless sign-in using one-time links or codes
Supports multiple social providers through built-in OAuth and generic OAuth plugin for custom providers
The passkey plugin adds FIDO2 / WebAuthn support for passwordless, phishing‑resistant sign‑in
Session settings allow you to configure expiresIn and updateAge to create longer or shorter sessions
Multi-language is supported via the i18n plugin
Email templates and FirebaseUI can be localized; set the language with a `languageCode` property or override CSS for more than 40 languages
| Better Auth | Firebase Authentication | |
|---|---|---|
Magic link and email OTP plugins allow passwordless sign-in using one-time links or codes | ||
Supports multiple social providers through built-in OAuth and generic OAuth plugin for custom providers | ||
The passkey plugin adds FIDO2 / WebAuthn support for passwordless, phishing‑resistant sign‑in | ||
Session settings allow you to configure expiresIn and updateAge to create longer or shorter sessions | ||
Multi-language is supported via the i18n plugin | Email templates and FirebaseUI can be localized; set the language with a `languageCode` property or override CSS for more than 40 languages |
Firebase Authentication offers significantly broader coverage than Better Auth, supporting 6 certifications and regulatory frameworks compared to 0 for Better Auth. Since Better Auth is open source and does not include compliance certifications, you’ll need to manage compliance yourself.

| Compliance | Better Auth | Firebase Authentication |
|---|---|---|