Thinker: Better Prompts for ChatGPT, Claude & Gemini — AI Prompt Coach

Write sharper prompts for ChatGPT, Claude & Gemini. Thinker scores each one and shows how to improve it. Free, no signup to start.

Meseekna Thinker is a prompt coach for ChatGPT, Claude, and Gemini. Send a prompt and the small brain icon beside the chat box lights up with a reading of the thinking it leaned on — hover to see why, and click Strengthen for a sharper version you can use right away. Better prompts, better answers, without changing how you work. ✅ How it works • Write in ChatGPT, Claude, or Gemini the way you always do. • When you send, Thinker scores what you asked, and the brain lights up in the color of the thinking it leaned on. • Hover to see why. Click Strengthen to get a sharper version you can drop in with one tap. 🧠 What Thinker looks at Every prompt gets a reading on four measures of clear thinking, from Meseekna's decision-science research — the part of prompt engineering most tools skip: • Information management — giving the AI the context it needs • Task management — framing the actual job clearly • Breadth of approach — bringing in more than one angle • Strategic quantitative reasoning — using numbers, limits, and trade-offs 🎁 Try it before you sign up Your first five prompts are scored by the full engine — not a demo — with the reasoning behind each one, plus two rewrites. No account needed to start. When you sign up, that history comes with you. 📈 Free and Pro Free covers 30 readings a day and 10 rewrites a month. Pro ($20/month or $200/year) raises that to 200 readings a day and 20 rewrites a day, and adds a weekly recap, your full history, and four coaching voices. Upgrade right from the extension. 🔒 Your prompts stay yours Thinker runs only on chatgpt.com, claude.ai, and gemini.google.com. The only thing it sends to our servers is what you actively submit there, so it can be scored. That text is never sold and never used for advertising. Full detail in our privacy policy. 🖥️ On a Mac? The Meseekna Thinker desktop app scores what you write in native AI apps too. The extension covers the web. Built on Meseekna's research into how people make decisions under pressure — cognitive science since 1965, with 500+ peer-reviewed publications — the same model behind Meseekna's simulations.