ForthWrite is an AI email assistant that learns your personal writing style from your sent emails and auto-generates replies in Gmail and Outlook. It runs as a Chrome extension, requires a 2-minute setup, and becomes more accurate with every email you send or edit.
What is ForthWrite?
ForthWrite is an AI-powered email drafting tool that reads the full email thread and produces a reply in your unique voice. It operates inside Gmail and Outlook via a Chrome extension, or from its standalone dashboard. The product is built by the ForthWrite team and integrates with nine major language model providers (OpenAI, Claude, Gemini, Grok, DeepSeek, Mistral, Perplexity, Cohere, LibreChat) under a bring-your-own-key model.
Key Features
- Voice Match — Captures tone, sentence rhythm, and sign-offs from your real sent mail. A dashboard curve shows how closely drafts match your writing over time.
- Prompt Lab — Version-control your prompts, A/B test them against your sent mail, and let an optimizer suggest edits grounded in your own data.
- Performance Analytics — Tracks acceptance rate, similarity score, edit-distance, and time saved per draft.
- Auto-Draft — Background drafts are written as emails land; when you open Gmail, replies are already waiting. Can batch draft dozens of threads in parallel.
- Choose Your Model — Select from nine AI providers (Claude for tone, GPT for reasoning, Grok for cost, etc.) — no other email tool offers model switching.
- Context-Aware Replies — Reads the full thread including forwards and nested intros, addressing every open question, not just the last message.
- Data Privacy — Sent emails used to train your voice are encrypted, isolated to your account, never shared, and never used to train shared models. Your BYOK credentials are encrypted at rest. One-click data wipe anytime.
Who is it for?
- Busy professionals who send high volumes of email and want each reply to sound like them, not generic AI.
- Sales and business development executives who need to respond quickly and professionally to client inquiries — one user reported earning an extra $6,000 using the tool.
- Customer support teams managing multi-threaded conversations who need context-aware replies addressing every open question.
- Founders and CEOs who want to maintain a personal voice across correspondence without spending hours drafting.
What can you do with ForthWrite?
- Reply to email threads instantly — Open a thread, click Generate Draft, and get a polished reply in your voice ready to send.
- Batch draft incoming emails — Let auto-draft write replies in the background while you work on other tasks.
- Refine your writing style — Use the Prompt Lab to test different instructions and see which prompts produce drafts most similar to your actual sent mail.
- Track your productivity — Monitor acceptance rate, time saved, and how closely generated drafts match your voice over time.
How does ForthWrite work?
- Set up in minutes — Add the Chrome extension to Gmail or Outlook, spend two minutes defining your persona (or skip to start drafting immediately).
- Click Draft, Hit Send — Open any email thread, click Generate Draft, and get a polished reply. Edit if needed or send as-is.
- Gets more like you every send — Every accepted draft and edit trains ForthWrite; the dashboard shows a climbing similarity curve.
Pricing
ForthWrite offers a free tier with a 14-day Pro trial (no credit card required) and a 60-day money-back guarantee. Specific paid plan pricing is not disclosed on the page.
FAQ
Is ForthWrite free?
Yes, you can get started free. It includes a 14-day Pro trial without requiring a credit card, backed by a 60-day money-back guarantee.
How does ForthWrite protect my data?
All sent emails used to train your voice are encrypted, isolated to your account, never shared, and never used to train shared models. Your bring-your-own-key cre
