AI Prompt Library for ChatGPT, Claude and Gemini
A prompt library is one place to keep the prompts you reuse, so you stop retyping them. On Deftro each prompt is saved once with a short name. The browser extension inserts it into ChatGPT, Claude, Gemini or Grok when you type // and the name, and asks for any blanks like [TOPIC] first.
Most installed prompts
Public prompts, most installed first. Open one to read it in full before you use it.
No public prompts yet
When an author makes a prompt public, it shows up here. Everything you save stays private until you choose otherwise.
Open DiscoverInsert prompts with //
Save a prompt once, then use it in the chatbot you already have open.
Type // in the message box
The browser extension works in ChatGPT, Claude, Gemini and Grok. Type // and the start of a prompt's name, pick it with Enter, and fill in any blanks. The text waits in the box: nothing is sent until you press send.
The Chrome Web Store listing is not live yet.
Guides
Reuse prompts in ChatGPT
Keep the prompts that work in one library and insert them into ChatGPT, Claude or Gemini by typing // and a short name. Blanks filled for you.What are agent skills?
What an agent skill is, what goes in a SKILL.md, and how Claude Code, Cursor, Codex and Antigravity load them. With examples you can install.
Questions
What is the best free prompt library?
The one you will open when you need a prompt. Look for three things: you can save your own prompts as well as find other people's, you can insert them in the chatbot you use without copy and paste, and you can see who wrote each one. Deftro is free for one person and for a team of up to ten.
How do I reuse a prompt in ChatGPT?
Save it on Deftro with a short name, add the browser extension, then type // and the start of the name in the ChatGPT message box and press Enter. Without the extension, open the prompt's page and use Copy text.
What are blanks in a prompt?
Words in capitals inside square brackets, like [TOPIC] or [AUDIENCE]. When you insert a prompt that has them, the extension asks for each one in a short form and puts your answers in place before the text reaches the message box.
Are my prompts private?
Yes, by default. Nobody else sees a prompt you save until you share it or make it public. The prompts on this page are ones their authors chose to make public.