Massvai
AI app builder that generates full-stack Next.js apps
About Massvai
Massvai is an AI app builder for founders, product teams, agencies and developers who want more than a throwaway prototype. A user describes an app in plain language, optionally adding a screenshot or reference file, and an AI coding agent plans the work and writes a full-stack Next.js project in TypeScript.
The workspace shows progress in a live preview while the app is built, and it keeps progress and tool history so long tasks can be stopped or retried. The project connects to Supabase for authentication and data, syncs to GitHub, and can be deployed to Vercel from a guided publishing flow. Styling uses Tailwind CSS with a consistent design system.
The site stresses code ownership: every file can be reviewed and exported, with no lock-in. Typical uses include SaaS MVPs with auth, dashboards and billing-ready UI, internal tools, and client websites. A free plan includes welcome credits, and paid Builder and Pro plans add monthly credits and extra workflow features.
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