PromptTools
Free AI prompt tools + 21 dev utilities. No signup, ever.
What is PromptTools?
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.
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