Show HN: Nut – App builder with test writing and time travel debugging

Hi HN, I'm the CEO at https://replay.io. We've been working for several months on helping AIs be proficient at using our time travel debugger to fix broken web apps (previous post: https://news.ycombinator.com/item?id=43258585)

Today we're launching https://nut.new to roll these capabilities into a complete app builder for one shotting working web apps.

When you ask Nut for an app, it discusses the requirements with you and develops a plan: how the pages will be laid out, the different features, database specification, APIs the app will use, tests that are needed, and so on.

Nut builds a non-functional mockup first, then implements working versions of the app’s components, then writes tests for those components and fixes the problems they surface using Replay's time travel debugger. All this is done in parallel, with workers merging changes into the app only when all tests pass, as professional engineers would do.

We want building basic web apps with AI to work reliably and with barely any effort, like waving a magic wand. We're not quite there yet, but we've been enjoying building apps with Nut quite a bit and want to share it with you.