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About ForthWrite
ForthWrite is an email writer for Gmail and Outlook that learns your voice from sent mail and drafts replies that sound like you.
ForthWrite is an AI email writing assistant that learns your writing style from your real sent mail and uses it to generate drafts that sound like you wrote them.
It works natively inside Gmail and Outlook via a Chrome extension. Key capabilities include:
- Voice matching: captures your tone, rhythm, and sign-offs from sent history
- Auto-draft: generates replies as emails arrive, before you open your inbox
- Recipient-aware drafts: adapts style based on who you are writing to
- Prompt Lab: version-control and A/B test your persona prompt against real sent mail
- BYOK support: bring your own API key for Claude, OpenAI, Grok, Mistral, and others
- Performance analytics: tracks acceptance rate, voice alignment score, and time saved
- Data portability: full training data export and one-click wipe
Free tier includes 10 drafts per week with no credit card required. Paid plans start at $18 per month and include unlimited drafts, custom persona prompts, and auto-draft.
Comments (1)
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@curtis · 7/6/2026
I've tried a lot of AI email tools and they all produce the same generic output, which is the reason I made ForthWrite. It actually learns from the gap between what it drafts and what I end up sending. After a few weeks the drafts need almost no editing. It works right inside Gmail via the Chrome extension, so there's no new app to learn. Highly recommend for anyone who sends a high volume of professional email and wants to get their time back.