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 $15 per month and include unlimited drafts, custom persona prompts, and auto-draft.
