Best AI email writer for Gmail, Outlook and Mac

The best AI email writer depends on where you write mail. If your mail is in iCloud, Gmail and Outlook, Alrighty writes replies in your own voice from what you sent that person before, and lets the AI you already use, such as Claude or ChatGPT, read your mail before it writes. Gmail's Help me write is the free pick inside Gmail. Copilot suits people who pay for Microsoft 365. Apple's Writing Tools come with the Mac. Grammarly works in almost any app, Superhuman and Spark are mail apps with a writer built in, and Mailmeteor's free web tool writes an email from a short prompt with no sign-up.

Most lists of AI email writers rank marketing and sales tools, and judge them on templates and tone buttons. They skip three things that decide whether the draft is any good and whether you should use it: what the writer reads before it writes (only your prompt, or your past mail), which AI company gets your words, and whether it sits where you already write email. This page answers those three for each tool.

How we checked

We read each vendor's own pricing, help and privacy pages on November 4, 2026, and every fact links to its source. For Alrighty, we read our own code. Where a vendor's page does not answer a question, we say "not stated" and do not guess. We did not test the tools. Alrighty is our app, and it's listed first.

The AI email writers at a glance

Tool	Price from	Where you write	What it reads to write	Which AI company
Alrighty	14-day trial, then Free or Pro	Alrighty on Mac, Windows or Linux	The conversation and what you sent that person	OpenAI; or the AI you connect
Gmail Help me write	Free for personal Gmail (US)	Gmail	Not stated	Google
Copilot in Outlook	Microsoft 365 Personal, $9.99/mo	Outlook	Not stated	Microsoft
Apple Writing Tools	Comes with macOS	Apple Mail and most Mac apps	The text you select; Compose sends to ChatGPT	Apple; OpenAI for Compose
Grammarly	Free, 100 AI prompts a month	Apple Mail, Outlook, Gmail and more	Not stated	Not named ("vetted service providers")
Superhuman	$25/member/mo, billed yearly	Superhuman	Not stated	Not named
Spark	Plus $10/mo or $99/yr	Spark	Not stated	Azure OpenAI
Mailmeteor AI Email Writer	Free, no sign-up	A web page; you paste the result	Your prompt only	"GPT models"

"Not stated" means the vendor's pages we read don't say. It does not mean the answer is bad.

Alrighty: best AI email writer for replies in your own voice

Alrighty is a desktop mail app for Mac, Windows and Linux that puts iCloud, Gmail and Outlook in one inbox. Its writer starts from one idea: most people already write email with an AI. They copy a message into a chat, work on a reply there, and paste it back. Alrighty removes those steps.

• Replies in your voice. When you open a reply, Alrighty writes a draft from the conversation and from what you sent that person before, so it sounds like you and not like a template. It is always a draft. You edit it and you click Send.
• Your own AI, with your mail in front of it. A local MCP server on your computer lets Claude (the desktop app and Claude Code), ChatGPT's desktop app, Codex, Cursor, VS Code, OpenCode, Antigravity or a local model read and search your mail across every account. So when you ask Claude to write an email, it can look up the thread, the dates and what you already said before it writes, instead of working from a prompt alone. The setup guide has the steps for each one, and our guide to letting Claude read your email walks through Claude.
• It writes in a window you watch. That AI can open Alrighty in a window of its own and write replies there. You see each step and can take over. Nothing sends until you click Send.

What it reads to write. The reply drafts read the conversation and your earlier mail to that person. Your own AI reads what it searches for, and you see it in the window.

Which AI company gets your words. Reply drafts go through Alrighty's server to OpenAI's GPT-6.1 Terra, which is asked not to store them. With your own AI, it's the assistant you connect, so a local model keeps everything on your computer. Signed out, nothing goes to Alrighty's server.

On by default. Partly. When you're signed in, opening a reply starts a suggested draft by itself. The link to your own AI is off until you turn it on with Connect AI.

Price. A 14-day trial with no card, then a Free plan or Pro. Free has a small monthly AI allowance.

What it can't do. Its built-in writer works on replies. It has no button that writes a brand-new email from a prompt, so for that you ask your own AI. There's no iPhone or web app, and no calendar. It takes iCloud, Gmail and Outlook accounts only, so no Yahoo, Fastmail or other IMAP. It's a new app with no long track record yet.

Pick it if most of what you write is replies, you want them to sound like you, and you'd like Claude or ChatGPT to read your mail before it writes.

Gmail Help me write: best free AI email writer in Gmail

Help me write is Gemini's writer inside Gmail, so there's nothing to install. For personal Gmail accounts with no paid plan, Google lists Help me write and Suggested Replies as available in the US only (Google). Google says "availability is currently limited to the US for users with personal Gmail accounts without a paid plan." You can also change the tone and length of a draft. Gemini is also "included with all Google Workspace subscription plans" (Google).

Which AI company gets your words. Google. Your mail is already with Google, so no other company is added. Google's Gmail AI page says it uses "automated tools to remove personally identifiable information (PII) from data subsets used to train Gemini." It does not say your data is never used for training.

What it can't do. It works in Gmail only. Outside the US, a free personal account doesn't get Help me write, and several features are English only.

Pick it if you write in Gmail in the US and want an AI writer at no cost.

Copilot in Outlook: best if you already pay for Microsoft 365

Copilot is built into Outlook and "drafts emails and summarizes lengthy email threads" (Microsoft). For home users it comes with Microsoft 365 Personal at $9.99 a month or $99.99 a year, and Premium at $19.99 or $199.99 (Microsoft). Businesses can buy Business Standard with Copilot at $23.50 per user a month, paid yearly.

Which AI company gets your words. Microsoft.

What it can't do. It needs a paid Microsoft 365 plan. On Family, Copilot in Outlook is "available only to the subscription owner," so other members of the plan don't get it.

Pick it if you already pay for Microsoft 365 and write your mail in Outlook.

Apple Writing Tools: best built into the Mac, in any app

Writing Tools come with macOS on a Mac with M1 or later (Apple). You select text, Control-click it, choose Writing Tools, then Show Writing Tools (Apple). From there you can proofread, rewrite in a Friendly, Professional or Concise tone, summarize, or click Describe a change and say what you want.

To write a new email from nothing, Control-click an empty field while you type, choose Show Writing Tools, then click Compose. Compose uses ChatGPT, and it's available only where the ChatGPT app and service are offered. In Apple Mail, Apple Intelligence can also suggest a reply: "Click the Message field, then choose a suggested reply," and "Apple Intelligence drafts a reply in the email" (Apple).

Which AI company gets your words. Apple, for rewrites and suggested replies. Some tasks run on the Mac, and others go to Private Cloud Compute, which "uses larger, server-based models." Apple says "The data being processed in Private Cloud Compute is not stored or made accessible to Apple" (Apple). Compose sends your request to OpenAI's ChatGPT.

What it can't do. "Apple Intelligence on macOS 27 is not available in all languages or regions," and features that rely on server models "are subject to daily usage limits." It doesn't work on devices bought in mainland China (Apple).

Pick it if you want a writer in every Mac app, with no new account and no new company for rewrites.

Grammarly: best AI email writer that works in the mail app you have

Grammarly is a writing assistant, not a mail app. Its Mac app says "Grammarly will work in Apple Mail, Outlook, Gmail, and most other email clients," and "Grammarly's generative AI lets you draft reports, reply to emails, come up with ideas, and more in seconds" (Grammarly). It needs macOS 10.15 or newer.

Price. The Free plan includes "100 AI prompts" a month, and Pro is $12; the plans page doesn't show the billing period (Grammarly). Grammarly is now part of Superhuman.

Which AI company gets your words. Not named. Grammarly says prompt data "will be shared with our small number of thoroughly vetted service providers," and "We do not allow these large language model (LLM) service providers to train their models on user content." Grammarly itself "may leverage random samples of aggregated and de-identified user content" to improve its service unless you opt out (Grammarly).

What it can't do. It doesn't read your mailbox, so it writes from what's on screen and what you ask. The free plan caps AI prompts.

Pick it if you want to keep Apple Mail or Outlook and add an AI writer on top.

Superhuman: best AI email writer in a Gmail or Microsoft 365 mail app

Superhuman is a mail app on Mac, Windows, iPhone and Android, "Built for teams that use Gmail or Outlook" (Superhuman). Starter, at $25 per member a month billed yearly, includes Superhuman AI: Write with AI, Instant Reply, Auto Summarize, Autocorrect and Autocomplete. Business, at $33, adds Auto Drafts and Ask AI (plans). Each plan card lists Mail, Grammarly, Docs and Go.

Which AI company gets your words. Not named. Its privacy policy says "we restrict our AI service providers from training their models on user content."

Sends without you. It can. Superhuman's mail page lists "sending fully written emails on your behalf," if you want it (Superhuman).

What it can't do. No iCloud, Yahoo or other IMAP accounts. If that rules it out, see our Superhuman alternatives.

Pick it if your mail is Gmail or Microsoft 365 and you'll pay for a fast app with a writer built in.

Spark: best AI email writer on every device

Spark runs on Mac, iPhone, Windows and Android, and takes iCloud, Gmail, Outlook, Yahoo, Exchange and IMAP (Spark). Its AI covers Compose, Translate, Summary, My Writing Style, Templates and Auto-Drafts (Spark). The pages we read don't say what My Writing Style reads to learn your style.

Price. AI is "available as a part of the Spark paid plans," with a limited preview on Free. Plus is $10 a month or $99 a year, and Pro, with Auto-Drafts, is $20 or $199 (pricing).

Which AI company gets your words. Microsoft's Azure OpenAI. Spark says Azure OpenAI "will not retain the data for more than 30 days," "does not use this data to train models," and "Spark does not store this data" (Spark).

On by default. No. "By default, Spark +AI is turned off." On a Mac you open Spark Settings, go to Spark +AI and turn on the toggle (Spark).

What to know. Some Spark features "require our server-side email processing to work" (Spark). Our Spark alternatives page covers this.

Pick it if you write on your phone and your Mac and want the same writer on both.

Mailmeteor AI Email Writer: best free one-off writer, with no account

Mailmeteor's AI Email Writer is a web page. It "uses leading large language models (LLMs) to generate an email from a short prompt," and Mailmeteor says it is "100% free," with "No sign-up, credit card, or usage quota" (Mailmeteor).

Which AI company gets your words. The page says it works "thanks to GPT models" and that "Mailmeteor does not log or share your drafts."

What it can't do. It isn't in your mail app. It reads only your prompt, so it knows nothing about the thread or how you write, and you copy the result into your mail. For a writer inside Gmail, Mailmeteor points to its separate AI Email Assistant.

Pick it if you need one email written now and don't want to sign up for anything.

What about Claude or ChatGPT on their own?

Many people already write email in a chat window: they paste the message in, ask for a draft, and paste the answer back. That works with any mail app. The draft is only as good as what you paste, because the chat can't see the rest of the thread or your earlier mail. Connecting the assistant to your mail fixes that. Our page on email apps for Claude and ChatGPT compares the ways to do it.

How to choose

• Replies in your own voice, and Claude or ChatGPT reading your iCloud, Gmail and Outlook mail before it writes: Alrighty.
• Free, in Gmail, in the US: Gmail Help me write.
• Already paying for Microsoft 365: Copilot in Outlook.
• A writer in every Mac app, with no new account: Apple Writing Tools.
• Keep Apple Mail or Outlook and add a writer: Grammarly.
• A Gmail or Microsoft 365 team that wants a fast app: Superhuman.
• The same writer on Mac, iPhone, Windows and Android: Spark.
• One email now, no sign-up: Mailmeteor.

For AI that does more than write, such as answering questions or sorting mail, see the best AI email assistants. For whole mail apps with AI inside, see the best AI email clients. More lists are on the blog, and what Alrighty does is on features.

Questions

What is the best free AI email writer?

Gmail's Help me write is free for personal Gmail accounts in the US. Apple's Writing Tools come with macOS on a Mac with M1 or later. Grammarly's free plan has 100 AI prompts a month, and Mailmeteor's web tool is free with no sign-up. Alrighty has a Free plan with a small monthly AI allowance after its 14-day trial.

Can an AI email writer write in my own voice?

Some try to. Alrighty writes replies from what you sent that person before. Spark has a feature called My Writing Style, and Apple Mail has a Personalize Smart Replies setting under Mail > Settings > Composing. A web tool that reads only your prompt can't know how you write.

Is it safe to give an AI email writer my email?

The AI company sees what you give the writer, so check which one it is before you paste or connect. Spark names Azure OpenAI, Alrighty names OpenAI, and Grammarly says its model providers can't train on your content. A local model keeps everything on your Mac. A message can also hide instructions aimed at an AI, so use a writer that can't send without you.

What is the difference between an AI email writer and an AI reply generator?

A reply generator answers a message you got, so it can read that message and the thread. An AI email writer can also start a new email from a prompt, where it has only what you tell it. Alrighty's built-in writer does replies, and your own AI through Alrighty can look things up in your mail first.

Which AI email writer works in Apple Mail?

Apple's Writing Tools and Smart Reply are built into Apple Mail. Grammarly's Mac app says it works in Apple Mail too. If you want to leave Apple Mail, see our Apple Mail alternatives.