Email tool comparison
ForthWrite vs Microsoft Copilot
Native to Microsoft 365. Locked to one model. Locked to one ecosystem.Here's where each tool wins, and where the depth-on-voice differentiator actually matters.
ForthWrite
A writing platform for people who care how their email reads. Voice matching on every tier; coaching dashboard on Standard+; auto-draft, batch, and Prompt Lab on Pro. 9-provider BYOK.
Where we win
- Edit capture on every tier; coaching dashboard on Standard+; RAG injection on Pro
- Measurable improvement curve on the dashboard (Standard+)
- 9-provider BYOK on Standard and Pro
- Standalone web compose surface in the browser
- Free tier includes voice matching (not just basic drafting)
Pricing: Standard $18/mo, Pro $36/mo. BYOK saves ~17%.
Best for: Professionals who want their email to keep sounding like them - and want to see the improvement curve.
Microsoft Copilot
Microsoft's AI assistant for Outlook, Word, Teams, and the rest of M365. Deep ecosystem integration; single-model, single-vendor.
Where they win
- Native Microsoft 365 integration across Outlook, Word, Excel, Teams, and SharePoint
- Drafts emails from user prompts with control over tone and length; generates a first draft for review
- Thread summarization: summarizes long email threads in seconds with an overview at the top
- Unread email summaries: summarizes unread emails by topic to help users catch up quickly
- Urgency and priority analysis: flags urgent messages, categorizes priority, provides reasons for importance
- Action item identification in emails for organization and follow-up
- Coaching by Copilot: checks tone, clarity, and reader sentiment before you send; can flag if an email reads as accusatory
- Inbox rule management: create and manage rules using conversational Copilot chat
- Strong calendar and meeting context inside the Microsoft Graph
- Microsoft Teams integration: meeting summaries, action item extraction, AI-assisted chat
- Enterprise-grade compliance, data residency, and admin controls
- Available on web and mobile platforms
What they don't do (or charge extra for)
- No BYOK and no model choice - you get whatever Microsoft ships
- Personal Outlook requires a paid M365 Personal/Family subscription before Copilot Pro can be added
- No edit capture or measurable voice-improvement curve published
- Locked to the Microsoft ecosystem - cannot be used in Gmail or non-Microsoft tools
- Higher per-seat price for teams not already on Microsoft 365
- No free tier - paid subscription required for all Copilot features
Pricing: Copilot Pro $20/mo (consumer, requires paid M365 Personal/Family first). Microsoft 365 Copilot $30/seat/mo (commercial, annual commit).
Best for: Microsoft 365 shops that want a single-vendor AI layer across the whole Office suite and accept locked-in model choice.
Head-to-head
The product-behavior comparison, not the marketing-page comparison.
Copilot wins this row. If summarizing long threads or catching up on unread email is a priority, Copilot's native Outlook integration handles it well.
Different types of coaching: Copilot checks a draft before you send; ForthWrite's dashboard tracks voice improvement across sends over time.
Copilot spans the whole M365 suite. ForthWrite is email-only.
ForthWrite works in Outlook today: voice-matched, model-flexible, free to start.
Copilot is built for Microsoft-standardized orgs that want one AI layer everywhere (Outlook, Word, Excel, Teams). If that's you and your IT department has already paid for it, great. The question this page answers is: what if you want AI specifically for email, and you'd like it to actually sound like you?
ForthWrite runs inside Outlook Web (personal outlook.com, work outlook.office.com, and Microsoft 365 outlook.office365.com) with no IT ticket and no Copilot Pro add-on. Free tier includes voice matching: drafts get more like you after every send, because the system compares each AI draft to what you actually sent and uses the gap as a training signal. Copilot doesn't publish a comparable feedback loop.
On model choice: ForthWrite Standard and Pro ship with 9-provider BYOK. Same draft, different model: route a sensitive client reply through Claude, a quick acknowledgment through a fast cheap model, a research-heavy thread through GPT. Copilot gives you whatever Microsoft ships, take it or leave it.
On price: ForthWrite Standard is $18/mo (BYOK saves ~17%); Pro is $36/mo. Copilot Pro for personal use is $20/mo on top of a paid Microsoft 365 Personal subscription ($70–100/yr). For small teams evaluating Microsoft 365 Copilot at $30/seat/mo with an annual commit, the per-seat cost alone exceeds ForthWrite Pro. The math is not close once you account for the M365 prerequisite and the annual lock-in.
Copilot features ForthWrite does not offer: native Word, Excel, and PowerPoint drafting and editing across the full M365 suite; email and thread summarization with key-point extraction directly in Outlook; Microsoft Teams meeting summaries and action items; Copilot Studio for building custom AI agents on top of Microsoft Graph; and deep calendar and SharePoint context injected at draft time. If your organization is deeply standardized on Microsoft 365 and wants a single AI layer across every tool in that suite, Copilot's integration depth is purpose-built for that. ForthWrite is focused on one job: drafting email that sounds like you.
One angle that rarely appears in Copilot comparisons: ForthWrite works in Gmail and Outlook with the same voice profile and the same Chrome extension. If you use any Google Workspace alongside Outlook (Google Docs, Google Calendar, a Gmail account for side projects), ForthWrite covers both surfaces without switching tools. Copilot is Microsoft-only and cannot follow you into Gmail, Google Docs, or any non-Microsoft tool.
Frequently asked questions
Does ForthWrite require a Microsoft 365 subscription?
No. ForthWrite works in Outlook Web (outlook.com, outlook.office.com, office365.com) without any Microsoft 365 subscription. The free tier gives you 10 voice-matched drafts per week, no credit card required. It can generate a first draft for a response, let you adjust tone and length, and let you review it before you send. Copilot Pro for personal Outlook requires a paid M365 Personal or Family subscription on top of the Copilot add-on fee - it may suggest drafts, but it will not respond or send emails automatically for you either.
Is ForthWrite a free Copilot in Outlook alternative?
For email drafting specifically, yes. ForthWrite's free tier includes 10 voice-matched drafts per week in Outlook (or Gmail) with no credit card and no Microsoft subscription required. Copilot has no free tier - personal users need M365 Personal ($70-100/yr) plus Copilot Pro ($20/mo); commercial users need a Microsoft 365 Copilot seat at $30/seat/mo on an annual commit. If you want AI drafting in Outlook without the Microsoft subscription stack, ForthWrite is the lower-cost entry point.
Can ForthWrite summarize emails or threads like Copilot?
No. ForthWrite does not summarize emails or extract key points from threads. Copilot's native Outlook integration for thread summarization is a genuine strength - it summarizes long email threads in seconds, can summarize unread emails by topic to help you catch up quickly, prioritizes urgent items, highlights key points and action items, and places an overview at the top of messages. ForthWrite's job is drafting replies in your voice, not summarizing what you received. If thread summarization or inbox catch-up is important to your workflow, Copilot is the better fit for those specific features.
Does ForthWrite work in Google Workspace and Gmail as well as Outlook?
Yes. ForthWrite uses the same Chrome extension and the same voice profile across Gmail and Outlook Web. If you use both - a work Outlook account and a personal Gmail, or a Google Workspace organization that also has some Microsoft 365 tools - you get one consistent drafting layer across both surfaces without switching tools. Copilot is Microsoft-only and does not work in Gmail or Google Workspace.
Does ForthWrite integrate with Microsoft Teams?
No. ForthWrite does not integrate with Microsoft Teams. Copilot has native Teams integration including meeting summaries, action item extraction, and AI-assisted chat in Teams, as well as email coaching with tone, clarity, and reader sentiment checks in all Outlook experiences. ForthWrite's scope is email drafting in Gmail and Outlook Web - it does not extend to team messaging or meeting tools.
How does ForthWrite compare to Microsoft 365 Copilot for small teams on price?
Microsoft 365 Copilot is $30/seat/mo on an annual commit - a 10-person team pays $3,600/yr before any M365 base subscription costs. That includes email coaching, tone and clarity checks, reader sentiment analysis, and inbox rule management through conversational chat. ForthWrite Teams starts from $79/seat/mo (or significantly less on annual billing) and is focused purely on email drafting quality. If the primary need is better-voiced email drafts rather than AI across the full M365 suite, ForthWrite covers that job at lower cost and without the annual enterprise lock-in.
See the improvement curve for yourself
Free tier includes voice matching. No credit card, no API key. Compare your first ForthWrite draft to your first Microsoft Copilot draft and decide for yourself.