co-founder here, happy to answer any questions. We're currently in alpha - app.supabase.io

We also have a lot more to build, so to reward you for your patience we are completely free right now

How does app handle authn?

> We want to nail the auth and we're looking at leveraging Postgres' native Row Level Security. This is a tricky task to "generalize" for all businesses but we have some good ideas (we're discussing in our repo if you want to follow - https://github.com/supabase/supabase)