Best AI email reply generator, in your own voice

The best AI email reply generator is Alrighty if you use iCloud, Gmail or Outlook on a computer: when you open a reply, it writes a draft in your voice from what you sent that person before, and you change it with one click or one sentence. For free, Gmail's Help me write and Suggested Replies work in Gmail, and Apple Mail's Smart Reply works on a Mac with Apple Intelligence. Copilot drafts replies in Outlook for Microsoft 365 subscribers. Superhuman, Spark and Fyxer write a draft for each email that needs an answer before you ask. Shortwave writes replies for Gmail users from past sent mail.

Most lists of AI reply generators rank tools that rewrite a prompt you type. That's a chat window with extra steps. Three questions decide whether a reply generator saves you time: does it learn how you write from your own sent mail, does the draft wait for you or appear on its own, and can it ever send without you? This page answers all three for each tool.

This page is about one job, the reply. For AI that also searches, sorts and works across your inbox, see the best AI email assistants. For whole mail apps with AI inside, see the best AI email clients.

How we checked

We read each vendor's own help, pricing and product pages on November 4, 2026, and every fact about another product links to its source. For Alrighty, we read our own code. Where a vendor's page doesn't answer a question, we say "not stated" and don't guess. We did not test the tools or compare the quality of their drafts. Alrighty is our app, and it's listed first.

AI reply generators at a glance

Tool	Price for AI replies	Accounts	Learns from your sent mail	Drafts before you ask	Sends without you
Alrighty	14-day trial with no card, then Free or Pro	iCloud, Gmail, Outlook	Yes, what you sent that person	Yes, when you open a reply, signed in	No, you click Send
Gmail	Free for personal accounts (US)	Gmail	Suggested Replies match your past emails	No	No, you edit and send
Copilot in Outlook	Microsoft 365 Personal, $9.99/mo	Accounts in Outlook, with a license	Not stated; you give it instructions	No, you click Generate	No, you select Send
Apple Mail Smart Reply	Comes with macOS	Accounts in Apple Mail	Not stated on Mail's guide	No	No, you click Send
Superhuman	Starter $25/member/mo, billed yearly	Gmail, Microsoft 365	Yes, "the emails you've already sent"	Yes, on some plans	Its assistant can, if you want
Spark	Pro $20/mo or $199/yr	iCloud, Gmail, Outlook, Yahoo, IMAP	Yes, recent sent samples	Yes, once you turn on Auto-Drafts	No, "never"
Shortwave	$30/seat/mo	Gmail	Yes, "past sent emails"	No, one click	Not stated
Fyxer	Pro $37/mo billed yearly	Gmail, Outlook	"in your tone"	Yes, on Pro	No, "you decide"
Grammarly	Free, 100 prompts a month	Gmail and other apps	"sounds like you"	No, you type a prompt	Not stated

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

What makes an AI reply sound like you?

A reply sounds like you when the AI reads what you actually wrote before, not a style setting. Tools differ in how much of your mail they read for that.

• Your mail to this person. Alrighty reads the conversation and what you sent that person before, so a reply to your landlord doesn't sound like a reply to your sister.
• Your sent mail in general. Superhuman, Spark, Shortwave and Gmail's Suggested Replies learn from emails you've sent.
• Instructions you write. Copilot lets you "tell it how you want the drafts to be created." Grammarly works from the prompt you type.

The trade is plain. The more of your sent mail a tool reads, the better its drafts can match you, and the more of your mail goes to its AI.

Alrighty: best AI reply generator in your own voice

Alrighty is a desktop mail app for Mac, Windows and Linux that puts iCloud, Gmail and Outlook accounts in one inbox. Its replies start 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 puts that draft under the message.

• A draft in your voice. When you open a reply, Alrighty writes a suggested draft from the conversation and from what you sent that person before. It reads up to 12 of your sent emails to match how you write.
• Change it in one click or one sentence. Buttons shorten it, make it warmer or make it more formal. Or ask for a change in your own words, such as "say yes to Friday," and it rewrites the draft as it stands, your own edits included.
• Always a draft. You edit it and you send it. Nothing sends until you click Send.
• Or use your own AI. Claude, ChatGPT's desktop app, Codex, Cursor or a local model can read your mail and write replies in a window you watch, through Alrighty's local MCP server. Our AI email assistant guide covers that side.

Which AI writes it. The suggested draft goes through Alrighty's server to OpenAI's GPT-6.1 Terra, with storage at OpenAI turned off for the request. It sends the emails the draft needs: the conversation and your past mail to that person. With your own AI, the assistant you connect writes the reply, so a local model keeps everything on your computer.

On by default. Yes, once you're signed in: opening a reply starts a suggested draft by itself. Signed out, nothing goes to Alrighty's server. Clean up also sorts senders in the background while you're signed in.

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. There's no iPhone or web app, so no drafts on your phone. It takes iCloud, Gmail and Outlook accounts only, not Yahoo, Fastmail or other IMAP. It's a new app with no long track record.

Pick it if you're on a Mac and want a reply draft that sounds like you to each person, without copying mail into a chat.

Gmail Help me write and Suggested Replies: best free AI replies for Gmail

Gmail has two reply tools. Help me write works when "you can reply to an email or open a draft," then type what you want. It "proactively takes details from your other emails and Drive files" (Google). Suggested Replies offer short replies at the bottom of an email that match "the tone and style of your past written emails." You "tap a suggested reply," and "Before you send a response, you can edit it" (Google).

Who gets it. On a personal account, Help me write is "restricted to the US only." With "An eligible Google Workspace or Google AI plan," it's "Available in multiple supported languages globally." For Suggested Replies, "Personalization is not available for personal Google Accounts without a Google AI plan." Basic Smart Reply "is available to anyone who uses Gmail" in six languages (Google).

Which AI writes it. Google's Gemini, inside Google.

What it can't do. Gmail only. The personal, voice-matched replies need a paid Google AI plan.

Pick it if all your mail is Gmail and you want reply help at no extra cost.

Copilot in Outlook: best AI replies if you pay for Microsoft 365

In Outlook, you "select the Generate arrow. Copilot drafts a message for you," then "Edit the draft as needed, and then select Send" (Microsoft). To make drafts sound like you, "You can tell it how you want the drafts to be created." Microsoft's page describes instructions, not learning from your past mail (Microsoft).

Price. You need "a Microsoft Copilot (work) license or a Microsoft 365 subscription." For home users, that's Microsoft 365 Personal at $9.99 a month or $99.99 a year. Its AI features are "only available to subscription owner and cannot be shared" (Microsoft).

Which AI writes it. Microsoft.

What it can't do. No draft until you ask. It needs a paid plan.

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

Apple Mail Smart Reply: best free AI replies on a Mac

With Apple Intelligence, "Click the Message field, then choose a suggested reply," and Apple Intelligence "drafts a reply in the email." Then "When you're ready, click" Send (Apple). Writing Tools can rewrite what you typed.

Learns your voice. Not stated on Mail's guide.

Which AI writes it. Apple.

What it can't do. "Apple Intelligence on macOS 27 is not available in all languages or regions. Usage limits may apply."

Pick it if you want short reply help in the Mac's own app, with no new company.

Superhuman: best AI replies for Gmail and Microsoft 365 teams

Superhuman's Instant Reply shows "three draft replies under each conversation" and "matches the voice and tone in the emails you've already sent" (Superhuman). Auto Drafts goes further: "When it's time for you to follow up, we'll draft the email for you." It "is available on Business and Enterprise plans" (Superhuman).

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

Price. The mail app's Starter plan is $25 a member a month and Business is $33, both billed yearly (plans). Superhuman also sells an Email Assistant that "works directly within your existing Gmail or Outlook inbox," where "Every message that needs a response comes with a draft written in your voice." It's "$12 per month when billed annually," and "Nothing goes out without your approval" (Superhuman).

What it can't do. Gmail and Microsoft 365 only, so no iCloud or Yahoo. See our Superhuman alternatives.

Pick it if you're on Gmail or Microsoft 365 and want a draft waiting under every email.

Spark Auto-Drafts: best AI replies across Mac, iPhone, Windows and Android

With Auto-Drafts, "Spark automatically prepares a draft response" for emails from real people, not for newsletters, marketing, notifications or receipts. You "Toggle Auto-Drafts on" first, and "Spark never sends Auto-Drafts on your behalf" (Spark). "Auto-Drafts can follow your unique writing style and tone," using My Writing Style, which reads "a few samples of recently sent emails" (Spark).

Price. "The Auto-Drafts feature is part of the Spark Pro plan," $20 a month or $199 a year (pricing). Spark says it's "rolling out in phases on Desktop" (Spark).

Which AI writes it. Microsoft's Azure OpenAI, which Spark says "does not use this data to train models" (Spark).

Pick it if you want drafts waiting for real people's mail, on every device, with a clear switch.

Shortwave: best AI replies for Gmail

Shortwave's Ghostwriter "understands how you write from past sent emails." "With just one click, you get a complete, contextual draft" (Shortwave). Drafts that write themselves come only through Tasklet, a separate Shortwave product.

Price. Business is $30 a seat a month, Premier $45 and Max $120 (pricing).

Which AI writes it. Its plans run on Claude models, and its security page lists OpenAI, Anthropic and Pinecone besides Google Cloud.

What it can't do. It's for Gmail. Microsoft 365 and Exchange are "not supported at this time" (Shortwave).

Pick it if you're on Gmail and want one-click drafts that know your thread.

Fyxer: best AI replies inside Gmail or Outlook

Fyxer Pro adds "Replies drafted in your tone and automatic labeling" to your existing inbox. "Fyxer drafts replies in your inbox, and you decide what gets sent" (pricing).

Price. Pro is $37 a person a month billed yearly, or $49 monthly. The Free plan doesn't include automatic replies. The 14-day trial is of the Team plan.

Which AI writes it. Not named. Fyxer says "Your data is never used to train third-party AI models" (security).

What it can't do. "Fyxer securely connects to Gmail and Outlook," and lists no other providers (Fyxer). It's credit-based.

Pick it if you want drafts waiting in Gmail or Outlook without changing apps.

Grammarly: best for replies you start with a prompt

In Gmail, you "click the Grammarly icon in the bottom right of your document and type in a prompt," for "a fast first draft with AI that sounds like you" (Grammarly). It works in many apps, not only mail.

Price. Free has 100 prompts a month. Pro is $12 with 2,000 prompts a member a month (plans).

What it can't do. It drafts only when you prompt it, and its Gmail page doesn't say what it reads from your past mail.

Pick it if you want light reply help in the browser, free.

What about ChatGPT or Claude?

Many people already write replies in a chat: paste the email, ask for a reply, copy it back. That works with no new app, but the chat doesn't see your earlier mail to that person unless you paste it too. Claude's Gmail connector and ChatGPT's Gmail and Outlook plugins can read one account and draft there; our guide to email apps for Claude and ChatGPT compares them. Alrighty gives those same assistants iCloud, Gmail and Outlook together.

How to choose

• On a computer with iCloud, Gmail or Outlook, a draft in your voice to each person: Alrighty.
• Gmail, free: Help me write and Suggested Replies.
• Already paying for Microsoft 365: Copilot in Outlook.
• Short replies in the Mac's own app: Apple Mail Smart Reply.
• A draft under every email, Gmail or Microsoft 365: Superhuman.
• Drafts for real people's mail on every device: Spark Auto-Drafts.
• Gmail, one-click drafts: Shortwave.
• Drafts inside Gmail or Outlook, no new app: Fyxer.
• Free help you start with a prompt: Grammarly.

To see the rest of what Alrighty does, such as Stop mail and search across every account, read its features.

Questions

What is the best free AI email reply generator?

Gmail's Help me write and Suggested Replies are free for personal accounts in the US. Apple Mail's Smart Reply is free on a Mac with Apple Intelligence. Grammarly's free plan has 100 prompts a month, and Alrighty's Free plan has a small monthly AI allowance after its 14-day trial.

Can an AI reply to emails for me automatically?

Some write the draft on their own: Alrighty when you open a reply, Spark's Auto-Drafts, Superhuman and Fyxer. Most still wait for you to send. Spark says it "never sends Auto-Drafts on your behalf," and in Alrighty nothing sends until you click Send. Superhuman's assistant can send for you, if you want it to.

Does an AI reply generator read my sent emails?

The ones that match your voice do. Alrighty reads your past mail to the person you're answering. Spark reads a few recent sent emails, and Superhuman and Shortwave learn from mail you've sent. That mail goes to the tool's AI provider, so check which one it is.

Is it safe to let AI reply to my email?

Read every draft before you send it. An email can hide instructions aimed at an AI, and a draft can get a fact wrong. A tool that only drafts, and never sends, keeps that check in your hands.

Which AI reply generator works with Outlook?

Copilot in Outlook, Fyxer and Superhuman work with Outlook accounts, and Alrighty takes Outlook.com and Microsoft 365. Spark takes Outlook too. Shortwave doesn't support Microsoft 365, and Gmail's tools are Gmail only.