PromptDeck: A Prompt Manager for the Browser Chrome Web Store ↗
A Chrome extension that stores your prompts and injects them straight into whatever LLM tab you're in. Built solo to scratch my own itch, shipped to the Chrome Web Store, and now at roughly 500 users with no paid marketing.
Where it stands
The problem
Anyone who uses LLMs seriously ends up with a handful of prompts they retype constantly. They live in scattered notes, or in a chat scrolled too far back to find. There was no fast way to keep a personal prompt library and drop one into the page you're already working in.
How it works
Local prompt store
Prompts are saved through the extension storage API, so the library persists across sessions and syncs with the browser profile rather than sitting on a server.
Content script injection
A content script finds the active input on the page and writes the prompt into it directly, so there is no copy-paste step between picking a prompt and sending it.
Popup UI
The extension popup handles search, organisation and editing, kept deliberately small so it opens and closes faster than switching tabs would.
Localisation layer
Interface strings were pulled out into the extension's i18n structure once the user base turned out not to be English-speaking.
The data changed the roadmap
The Chrome Web Store dashboard showed that roughly 43% of installs were coming from Germany, with no marketing pointed there at all. The roadmap at the time assumed an English-speaking user base and had feature work queued on that basis.
I stopped that work and shipped multi-language support over a weekend instead. It was a small decision, but it was the first time I'd let a number in a dashboard overrule what I'd already planned to build, which is most of what analytics work turns out to be.
What it taught me
- Shipping a small, real thing surfaces more information in a week than planning does in a month.
- Distribution data is product data. The geography of your installs is a feature request in disguise.
- A tool that removes one repeated annoyance can hold users without any marketing behind it.
Live on the Chrome Web Store, at roughly 500 users.