FastLLM vs Massvai

FastLLM is an AI API gateway: a single endpoint and dashboard for accessing several large language models. Its site runs on the open-source New API gateway software, which offers OpenAI-compatible endpoints, per-key usage limits and a central admin dashboard for tracking consumption.

The idea is to let developers use different models through one key and one billing account instead of managing a separate account for each provider. Usage is tracked per key, so teams can share access while keeping an eye on spend.

Good fit if you: want one OpenAI-compatible endpoint for several models and simple usage tracking.
Less ideal if you: need enterprise contracts, data-processing agreements or guaran…

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 kee…