Massvai

Massvai is an AI app builder for Next.js. You describe a product in plain language, optionally with a screenshot or reference file, and an agent plans the work and writes a TypeScript project using Next.js, Tailwind and Supabase for authentication and data. You watch the app take shape in a live preview, can stop or retry the agent's work, and review every file. When it's ready, a guided flow pushes the code to GitHub and deploys it to Vercel, and you can export the whole project with no lock-in. It runs in the browser and as a desktop app for Apple silicon and Intel Macs, with Windows listed as coming soon. The free plan gives 100 welcome credits, Builder is $25 a month for 1,500 credits and Pro is $49 a month for 4,000 credits plus Supabase setup help and version history.