Chrome Extension · Free & Open Source
A personal prompt library that lives inside ChatGPT and Claude. Built for engineers and AI power users who are tired of retyping the same instructions every session.
Works on Chrome, Brave, Edge, and all Chromium-based browsers.
Launch walkthrough
Install, setup, and a real session showing how PromptMate fits into a daily AI workflow.
In the wild
Opens as a sidebar on both ChatGPT and Claude. No context switching, no separate tab.
One-click open on ChatGPT
The PromptMate button appears in the bottom-right corner.
Sidebar with tone & format
Search, pick tone, pick format, click Use. Done.
Same experience on Claude
Same sidebar, same library, both interfaces.
Insert with full context
Tone and format instructions are appended automatically.
Why I built it
I use Claude and ChatGPT for almost everything now: code reviews, draft emails, explaining concepts to teammates, writing scripts for YouTube. And I kept typing the same instructions over and over.
Not the prompts themselves — I had those saved in Notion, in a text file, scattered in browser tabs. The problem was the ritual: open a new chat, remember which prompt, find the file, copy, paste, adjust the tone manually. Every. Single. Session.
I wanted the prompts where the work happens. Not in a tab I have to switch to. In the sidebar, with one click to insert. So I built it.
Jitan Gupta
Built in Mumbai · See all builds →
What it does now · v0.4.5
This is what's shipped. Not what's planned. That's the roadmap below.
No tab switching. Your prompts live where you work — a sidebar that opens on both interfaces with one click.
Each prompt stores a tone (formal, casual, technical) and output format (bullets, steps, prose, code). Inserted together, in one click.
Syncs to your own private Google Drive folder. No data on my infrastructure. You own your library.
Prompts aren't locked. Open any saved prompt, tweak it mid-session, save back. The edit is yours.
Tracks how often you create, apply, copy, and delete prompts. Stored locally so you can see what's actually useful.
Roadmap
Two features in active design. If either matters to you, open an issue or contribute.
Every edit creates a version. Browse history, diff before/after, restore any prior version. Drive handles the revisions natively, so the architecture already supports it.
Publish a prompt to anyone-with-link. The receiver gets their own copy. No ongoing sync, no collaborative editing. Private by default, shareable on demand.
Free · Open source · No backend
Install PromptMate, save the prompts you actually use, and get them back in one click — in ChatGPT or Claude, on any device.