Prompt Natus
Every prompt optimizer extension uses a freemium model and provides very limited free quota. That was very frustating so I built my own extension. It uses the Google API key, which offers a generous free tier that's more than enough for personal use (50 to 1000 RPD depending on the model), and it's available for everyone.
Prompt Natus launched on November 3, 2025 with 6 votes, #2,995 of 9,796 launches that month.
What it does
Free prompt optimizer that uses your own API key—your data stays private. One-click optimization works on ChatGPT, Claude, Gemini, and more. No sign-ups or subscriptions. Just better prompts.
Does a similar job
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