I vibe-coded the same app on Supabase, Convex, Vennbase, and InstantDB. The results look the same, but they're not.

AI coding agents have opened app development to a lot of new people. Vibe coders, without a skilled software engineer to lean on, wish their agent could get further, more accurately and securely, with less human involvement.

Does a deliberate choice of backend help an AI coding agent succeed? I ran an experiment to find out.

I'll say upfront: I built Vennbase. It has a simpler security model, because coders and coding agents are taxed and limited by solving the same hard parts - backend, data