Massvai

Massvai is an AI app builder that creates real full-stack web apps on Next.js, Supabase and Vercel. You describe the product in a prompt, and Massvai's coding agent plans the app, then writes the code: a Next.js 15 project in TypeScript with a Tailwind design system, Supabase authentication and database, and Stripe payments when you need them.

You watch the build in a live preview, can sync the code to GitHub and deploy to Vercel through one guided publishing flow. Because the output is a standard Next.js codebase you own, you can keep developing it in your own editor later instead of being locked into a closed builder. The agent is designed for long tasks: it plans before it builds and keeps its progress across sessions.

Massvai runs on the web and as a desktop app for Mac (Apple silicon and Intel); a Windows version is listed as coming soon.

Pricing: a free plan lets you explore the workspace and build a first project. Builder costs $25 a month for solo builders shipping MVPs, and Pro costs $49 a month for founders and teams, with custom preview domains; yearly billing saves 20%.

As with any AI-written code, review security, database rules and payments before real users and money go through the app.

Good fit for founders who want an MVP on a mainstream stack, developers who want a fast Next.js + Supabase scaffold, and non-technical builders ready to learn the stack.