Email that sounds like you,
in Outlook
Voice-matched drafting for Outlook.com, Outlook 365, and Microsoft 365. Pick your own model. Free to start. No Copilot Pro subscription required.
Works on every flavor of Outlook Web
outlook.live.comFree Microsoft accounts and Microsoft 365 Personal/Family.
outlook.office.comBusiness and enterprise tenants on M365.
outlook.office365.comOlder tenant URLs; supported automatically.
ForthWrite runs through our Chrome extension, which activates the moment you load Outlook Web in Chrome or Edge. No Microsoft 365 subscription required for personal Outlook accounts.
Outlook users have been waiting
for a serious voice tool.
Microsoft Copilot is the official answer, and it's a fine enterprise product. But it's paid-only, locked to one model, and doesn't help you outside the Microsoft ecosystem. Here's what changes when you pick a depth-on-voice tool instead.
Voice matching that grows over time
Every Outlook reply ForthWrite drafts is compared to what you actually sent. The gap becomes a training signal, and the voice profile regenerates every ~50 captured emails. Drafts get more like you with use — and the dashboard shows the curve.
Choose your model
Standard and Pro ship with 9-provider BYOK: OpenAI, Anthropic, Google, xAI, DeepSeek, Mistral, Perplexity, Cohere, and Groq. Route warm replies through Claude, fast acknowledgments through a cheap model, research-heavy threads through GPT. Copilot gives you one model.
One tool across Gmail and Outlook
Most professionals juggle a work mailbox and a personal one — often on different providers. ForthWrite runs in both with the same voice profile, the same prompts, the same training data. Copilot only helps you in Microsoft.
Honest comparison
ForthWrite vs Microsoft Copilot
Copilot wins if you want one AI layer across Outlook, Word, Teams, and the rest of M365 — and your IT department has paid for it. ForthWrite wins on voice depth, model choice, price, and starting from free. Both are real. The full table is on the comparison page.
Three steps. No Microsoft 365 prerequisite.
Free tier works on a free Outlook.com account. No Copilot Pro, no admin approval, no per-seat commit.
Install the Chrome extension
One click from the Chrome Web Store. Activates on Outlook Web automatically — no IT ticket, no Copilot Pro add-on, no Microsoft 365 prerequisite.
Let it learn your voice
ForthWrite reads your sent items (with your permission) and builds a voice profile. Free tier includes this. Drafts start sounding like you from day one.
Draft inside Outlook
Open a thread, hit Generate. The draft appears in the reply pane the same way it does in Gmail — same widget, same shortcuts, same voice match.
Try ForthWrite in Outlook today.
Free tier includes voice matching, 10 drafts a week, and works on every Outlook Web surface. No credit card, no Microsoft 365 requirement, no Copilot Pro add-on.
If you're not drafting sharper Outlook emails in less time within 30 days, we'll tune your setup with you 1-on-1 or refund every cent. Either way, you walk out ahead.