Clerk
Clerk is only available for React projects
Clerk brings a comprehensive set of user management and authentication features to StarterKit. It excels in providing customizable, secure authentication flows, including two-factor authentication and user management capabilities, tailored to enhance user experience and security.

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Environment variables

Sign up for a Clerk account and create a new project. Add your public Clerk publishable key, sign-in URL, sign-up URL, and secret key to the .env file. 
# .env
PUBLIC_CLERK_PUBLISHABLE_KEY=
PUBLIC_CLERK_SIGN_IN_URL=
PUBLIC_CLERK_SIGN_UP_URL=
CLERK_SECRET_KEY=