Prompster

Prompster tackles a small but constant friction point in everyday AI work: retyping or re-pasting the same instructions in every chat window. The extension injects a slash-command menu into supported AI chat interfaces, so typing a trigger character and a keyword instantly expands into a full, saved prompt directly in the message box. There is no separate dashboard to switch to and no copy-paste loop.

Out of the box the extension ships with a built-in prompt library, and you can add your own prompts and keywords in a couple of clicks. Personal shortcuts are handy for recurring tasks such as writing styles, code reviews, research questions and translations. For more advanced workflows, Prompster supports variable placeholders: wrap part of a prompt in brackets, like [topic], and fill in the value when you invoke the command. It also exposes dynamic values such as clipboard content and the current date.

Prompster is developed by Lucas Aschenbach and published on the Chrome Web Store, where it holds roughly 4.2 stars from user ratings and reports around 8,000 users. The project is open source, and the developer states that the extension does not collect or use user data. The trigger character is configurable, and a list of supported chat apps is maintained on the project's GitHub page.