You paste a draft that sounds machine-written, and it hands back the same message in a looser, more human voice. It cuts the hedging and the filler sentences, varies sentence length, and reorders paragraphs when that reads better. It works on emails, essays, reports and forum posts, in English and Chinese.
The difference from asking a chatbot to "make it sound human" is that this model was trained to keep every number, unit, date, name and quote exactly as written, and to add nothing. In the developer's test on 420 English rewrites, a strict checker found no factual change in 376, and most of the misses were a single word. On a separate set of 210 drafts, the AI detector Originality.ai, at its strictest setting, flagged 11 rewrites as AI.
It is a 12 billion parameter model fine-tuned from Google's Gemma 4, released under Apache 2.0, with a free desktop app for Mac and Windows that runs it offline.