Forthwrite AI

ForthWrite AI is a Chrome extension that writes email replies for you, in your own voice. Connect it to Gmail or Outlook, and the next time you open a thread, a draft is already waiting. It reads the full conversation, picks up on every open question, and generates a response that sounds like you wrote it — not like a generic AI assistant. The setup takes about two minutes, and you can start using it immediately inside your inbox.

The tool learns from every email you send. Each accepted draft and manual edit feeds into a private model that captures your tone, sentence rhythm, and even your sign-offs. Over time, the drafts get closer to how you actually write. You can also choose which underlying AI model to use — OpenAI, Claude, Gemini, Grok, and several others — and bring your own API key. Features like Voice Match, Prompt Lab, and Performance Analytics give you control over the output and show you how well the drafts match your style. The auto-draft option writes replies in the background as emails land, so you open your inbox to find them already prepared.

This is built for anyone who spends a lot of time on email — CEOs, salespeople, customer support teams, freelancers. If you reply to dozens of messages a day and want to sound consistent and professional without typing every word, ForthWrite saves hours each week. It also works well for people who want to maintain a specific brand voice across their team's outbound communication.