Show HN: I made a free Prompt Optimizer extension for perfect prompts instantly (chromewebstore.google.com)

Prompt Natus is a free browser extension that provides one‑click prompt optimization for chatbots like ChatGPT, Claude, Gemini and Perplexity. Instead of routing your text through a service, the extension uses your personal Google API key (grabbed from aistudio.google.com) to rewrite messages into clearer, role/context-rich, instruction-based prompts. A small floating button opens a sidebar where you edit, “Optimize,” and paste the improved prompt back into any chat UI; the extension also stores up to 500 past optimizations locally and is open‑source with no accounts or external tracking. For the AI/ML community this lowers the barrier to professional prompt engineering and streamlines multi-model workflows: better-structured prompts can cut retries and improve output quality across models. Key technical points and tradeoffs: optimizations are generated via your Google API key (so usage is subject to your Google quota and any billing tied to that key), the API key and history remain stored locally (reducing server-side exposure), and only the necessary data is sent to Google’s API. The tool is lightweight and privacy-minded, but users should note their local device security and Google quota determine cost, limits, and risk.