PromptTools
Free AI prompt tools + 21 dev utilities. No signup, ever.
PromptTools launched on August 11, 2026 with 2 votes, #5,788 of 23,274 launches that month.
What it does
Free prompt engineering tools for ChatGPT, Claude, and Gemini. Test a prompt on 8 real AI models side by side, calculate token costs across 15 models, score prompt quality, and browse 165+ tested prompts. Plus 21 free developer utilities — JSON formatter, JWT decoder, regex tester, and more. No signup, ever.
Free prompt engineering tools for ChatGPT, Claude, and Gemini. Test, optimize, analyze, and compare AI prompts. Token calculator, prompt library, and more.
Score prompt clarity, test across 8 AI models, calculate token costs, and generate MCP tool definitions — real results in seconds, not after you've already burned the API call. No signup required. Free daily usage. Works with ChatGPT, Claude, Gemini, and more. Filter by category, or browse everything. No signup required. Built a tool but agents keep calling it wrong or not at all? Generate a spec-compliant MCP tool definition from a plain-English description, or validate one you already wrote. See exactly how much of your context window your system prompt, tools, and history are using — before you run out. Paste your git diff and get a clear commit message — Conventional Commits or plain,…from prompttools.dev
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