ForthWrite is an AI email writer that learns how you actually write, not how a generic AI thinks you should write. Unlike most email AI tools that produce one-size-fits-all drafts, ForthWrite compares every AI-generated draft to what you actually send, using that gap as a training signal. Over time, drafts get measurably closer to your voice. Your tone, sentence rhythm, and sign-offs.

The product works inside Gmail and Outlook through a Chrome extension, so no new app to learn. You open an email thread, click "Generate Draft," and get a polished reply ready to send. Every edit you make teaches the system what to keep and what to drop. The dashboard shows the curve climbing week over week as similarity scores improve and your drafts require less editing.

It supports bring-your-own-key with nine different AI models (Claude, GPT, Grok, Gemini, and others) so you can pick the model that works best for your use case. Your sent emails are encrypted, isolated to your account, never shared, and never used to train shared models. You can export all your data or wipe it with one click anytime.