Quick verdict
Use Clerk for polished auth UX. Use Supabase Auth when your database and auth should stay close together.
Best for
- Clerk: teams, organizations, polished auth flows
- Supabase Auth: lean apps already using Supabase
Watch out for
- Map users to billing records early
- Protect API keys behind authenticated server routes
Recommended stack
Clerk or Supabase Auth
Stripe
SilkRouter
Where SilkRouter fits
Your hosting, CRM, email, and automation tools should not force one model provider forever. SilkRouter gives AI startups one API for supported AI models, so routing and spend visibility can live in one place.
One API For All AI Models