Use Supabase Auth when configured, or continue as guest for BYOK testing.

Secure auth posture. PROMORP does not store passwords locally. Email/password access is handled by Supabase Auth through the Worker, with HttpOnly session cookies. Guest mode stays browser-local.
Signed-in users use Supabase Auth. Guest prompt history and analytics remain in this browser unless cleared. API usage depends on your provider key and provider limits.