
Clerk offers broader feature coverage than Firebase Authentication, supporting 31 features compared to 22. Clerk fully covers authentication and extensibility and more, and both tools fully cover branding.
Email templates and FirebaseUI can be localized; set the language with a `languageCode` property or override CSS for more than 40 languages
| Clerk | Firebase Authentication | |
|---|---|---|
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 Clerk, supporting 6 certifications and regulatory frameworks compared to 2 for Clerk.

| Compliance | Clerk | Firebase Authentication |
|---|---|---|