Free tools
Free tools for building with AI
Small, honest tools for founders and developers: write better prompts, plan the first version of your app, estimate what AI will cost you, and write a README people actually read. No sign-up, and everything runs in your browser.
- AI Prompt BuilderTurn a rough request into a clear prompt for ChatGPT, Claude or Gemini, in any answer language.
- MVP Scope PlannerDecide what goes in your app's first version and get a one-page plan with complexity and a timeline range.
- AI API Cost CalculatorEstimate your monthly AI API bill and compare OpenAI, Claude and Gemini models side by side.
- GitHub README GeneratorWrite a GitHub profile or project README with a live preview, skill icons and stats cards.
New to AI assistants? Start with the free guide, how to use AI in daily life.