AI Email Assistant for Outlook
Draft, reply, and summarize emails in Outlook in seconds. Voice input, 35+ languages, and a tone that actually sounds like you. Free to install.
Installs in 30 seconds · Free forever plan · Works in Outlook on web, desktop, and mobile
Built for Outlook. Designed for the way you actually work.
WriteMail's AI add-in lives inside Outlook — no copy-paste, no switching apps. Compose, reply, and summarize without leaving your inbox.
Voice-to-email
Speak naturally and WriteMail turns it into a clean, structured email. Hands-free drafting on desktop and mobile — perfect for replying while you're on the move.
35+ languages
Write in English, Spanish, German, French, Arabic, Japanese — and 30+ more. Translate incoming threads or reply in any language in one click.
AI replies & drafting
Generate context-aware replies from the thread you're reading. Adjust tone — formal, friendly, concise, assertive — and refine until it sounds like you.
Thread summarization
Long thread? Get a 3-bullet summary of who said what, what's been decided, and what's asked of you — before you read a single word.
What people use the Outlook AI add-in for
Reply to emails 10× faster
Click reply, pick a tone, send. The AI reads the thread context and drafts a response you only need to tweak.
Write emails in another language
Non-native speakers use WriteMail to send grammatically perfect emails in English, German, French, Spanish, Arabic, and 30+ more — instantly.
Summarize long threads
Catch up on a 40-message thread in 10 seconds with an AI summary that pulls out decisions, questions, and action items.
Dictate on mobile
Speak your reply on the Outlook mobile app and WriteMail formats it into a polished email in seconds — perfect for replying between meetings.
How to install the Outlook AI add-in
Install from Microsoft Marketplace
One click on Microsoft Marketplace. No admin install required for personal Microsoft 365 accounts.
Open Outlook
WriteMail appears as a button in your Outlook ribbon — on web, desktop, and mobile. Click to launch it inside any email.
Generate emails
Type a prompt or speak it. Pick tone and language. Drop the AI draft straight into your Outlook compose window.
Enterprise-grade trust, by default
Built to meet the security requirements IT teams expect from a Microsoft 365 add-in.
GDPR compliant
EU data residency available. Full data processing agreement on request.
SOC 2 controls
Encrypted in transit and at rest. Audit logs and access reviews on a SOC 2-aligned control set.
Your email data is never used for training
We don't train models on your inbox. Period. Your email content is processed for the sole purpose of generating your draft.
Microsoft 365 compatible
Outlook on web, Outlook for Windows, Outlook for Mac, Outlook mobile — and Microsoft 365 enterprise tenants.
Free to install. Free to use.
The WriteMail add-in is free forever for everyday email in Outlook — AI drafting and replies, 35+ languages, and voice input, with no credit card required.
Add to Outlook — FreeWhy WriteMail vs Microsoft Copilot?
Copilot is a great general assistant. WriteMail is built end-to-end for email — and it's free.
Voice-first drafting
Dictate emails in the languages Copilot doesn't speak naturally — including Arabic, Polish, and Indonesian.
35+ languages, equally fluent
Built for non-native speakers. No "English-first" tone slipping into your German or Spanish replies.
Free forever
No Microsoft 365 Copilot license required. Install from Microsoft Marketplace and write for free, today.
Single-purpose, polished
We do one thing: email. Faster replies, cleaner tone, and a UI that fits into your Outlook workflow — not bolted on top.
The AI email assistant for Outlook, explained
An AI email assistant for Outlook is an add-in that uses large language models to write, reply to, summarize, and translate emails — directly inside the Outlook compose window. Unlike a standalone tool, an Outlook AI add-in keeps you in your inbox: no copy-paste, no context switching, and no broken formatting when you send.
WriteMail is built specifically for that experience. It installs from Microsoft Marketplace in under 30 seconds, runs in Outlook on web, desktop, and mobile, and works for both personal and Microsoft 365 enterprise accounts. It's used by 320,000+ professionals across 35+ languages — and it stays free for everyday use.
Outlook AI add-in vs Copilot
- ✓ Free vs paid: WriteMail has a free forever plan; Copilot requires a Microsoft 365 Copilot license.
- ✓ Language depth: 35+ languages with native-grade tone, not English-first translation.
- ✓ Voice-to-email: Dictation built into the add-in, including mobile.
- ✓ Email-specific: Tone library and templates tuned for email — not a general chat UI.
Free AI Outlook plugin alternatives
Most "free" Outlook AI plugins cap you at a handful of drafts per day, lock summaries behind paywalls, or only support English. WriteMail gives you AI drafting, replies, and 35+ languages on the free plan — no credit card required.
If you want unlimited usage, thread summarization, and a shared tone library for your team, upgrade to Pro or Team. Otherwise, the free plan covers most professionals' day-to-day Outlook usage.
Why install today?
Outlook users spend 2.5+ hours per day on email. WriteMail's Outlook AI add-in cuts that by roughly 60%, saving the average professional 5–8 hours per week. Free to install — there's no reason not to try it before your next reply.
Related AI email tools
Start writing emails in Outlook with AI — free.
Install the WriteMail add-in from Microsoft Marketplace. Takes 30 seconds. No credit card.
Add to Outlook — FreeFrequently Asked Questions
Everything you need to know about AI Email Assistant for Outlook
How do I install the WriteMail AI add-in for Outlook?
Go to the WriteMail listing on Microsoft Marketplace and click "Get it now." The add-in installs into Outlook on web, desktop, and mobile in under 30 seconds. For Microsoft 365 enterprise tenants, your admin can deploy it organization-wide from the Microsoft 365 admin center.
Is the AI email assistant for Outlook free?
Yes. WriteMail has a free forever plan with AI drafting, replies, voice input, and 35+ languages. Heavy users and teams who need unlimited generations, thread summarization, and admin controls can upgrade to Pro ($9/month) or Team ($7/user/month).
Is WriteMail an alternative to Microsoft Copilot for Outlook?
Yes. WriteMail is a free, email-specific alternative to Microsoft 365 Copilot. Where Copilot is a general productivity assistant that requires a paid Microsoft 365 Copilot license, WriteMail is built end-to-end for email, supports 35+ languages with native-grade tone, includes voice-to-email, and starts free.
Does the Outlook AI add-in work on Mac, Windows, web, and mobile?
Yes. WriteMail runs inside Outlook on Windows, Mac, Outlook on the web, and the Outlook mobile apps for iOS and Android. The same add-in works across all surfaces — install once, use everywhere.
Will WriteMail use my email data to train AI models?
No. WriteMail never uses your email content to train models. Your emails are processed solely to generate the draft, reply, or summary you requested, and are encrypted in transit and at rest. EU data residency is available on Team plans.
What languages does the Outlook AI add-in support?
WriteMail supports 35+ languages including English, Spanish, French, German, Italian, Portuguese, Dutch, Polish, Arabic, Hebrew, Japanese, Korean, Chinese (Simplified and Traditional), Indonesian, Vietnamese, Russian, Turkish, and more. Each language has native-grade tone — not just word-for-word translation.
Can I use voice input to write emails in Outlook?
Yes. WriteMail includes voice-to-email — speak your draft naturally and the AI formats it into a clean, structured email. It works on desktop and mobile, in every supported language, and is one of the main reasons users prefer WriteMail to Copilot.
Is the add-in compatible with Microsoft 365 enterprise accounts?
Yes. WriteMail is Microsoft Marketplace verified and compatible with Microsoft 365 personal, business, and enterprise tenants. Admins can deploy it to specific user groups or the entire organization. SSO and admin controls are available on the Team plan.
Have more questions? Feel free to contact us!