Noren studies samples of your writing to build a voice profile — including anti-patterns, words you'd never use like 'delve' or 'leverage' — then applies it so ChatGPT, Claude, Gemini or your own model drafts in your voice instead of a generic one. It ships as a Studio, a desktop app, and a Chrome extension, with live ghost-text you Tab to accept. The company reports 90% of its hand-built voice guide is matched from raw samples, and a voice-fidelity test scored 4.0/5 on an unknown writer. The engine, app and extension are open source, not a prompt wrapper around one model.
What holds up
- +Free tier lets you start writing with Claude, GPT, Gemini, or your own API key — no card needed
- +Anti-pattern detection flags words you'd never use, like 'delve' or 'leverage', and strips them
- +Works across models — Claude, GPT, Gemini, Vertex AI — so you're not locked to one AI vendor
- +App and Chrome extension are open source, not just a prompt wrapper around one model
Mind the limits
- −Desktop app is macOS only, per the page's own tag — Windows and Linux users are limited to Studio
- −Voice-fidelity score of 4.0/5 comes from a single tester (n=1), not a broad study
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