7 Best AI Email Assistants in 2026

Key takeaways

• Superhuman Mail is the best AI email assistant in 2026 for anyone willing to pay for one. It works with Gmail and Outlook, and on its Business plan ($33 a user a month, billed annually) it writes replies in your voice before you open the thread.

• If you already pay for Google Workspace or Microsoft 365, you already have an AI email assistant. Help Me Write, thread summaries and Suggested Replies became free for every Gmail user in January 2026, and Copilot Chat in Outlook costs nothing extra on a Microsoft 365 work account.

• Check mailbox support before anything else. Shortwave works only with Gmail and Google Workspace, Copilot in Outlook needs a mailbox on Exchange Online, and Superhuman doesn't connect to plain IMAP accounts.

• Automatic drafting is the feature worth paying for, and it still gets things wrong. TechCrunch's reviewer caught Superhuman's new drafts saying yes to pitches and agreeing to a meeting after midnight, so read every draft before it goes out.

What changed in AI email assistants this year

The category grew and then started to shrink inside about a year. Grammarly bought Superhuman in July 2025 and renamed the parent company Superhuman that October, keeping Grammarly as a product name. Notion Mail, which launched in April 2025, shut down on September 22, 2026. Lindy, a regular on older lists of email assistants, now leads with an AI teammate for Slack.

The bigger change is that the email apps most people already pay for now do what a $10 add-on did two years ago. In January 2026 Google made Help Me Write, AI summaries of long threads and Suggested Replies free for every Gmail user. Microsoft put Copilot Chat inside Outlook at no extra cost for Microsoft 365 business users in September 2025, and on April 27, 2026 it started testing an agent mode in Outlook that sorts the inbox, drafts follow-ups and reschedules calendar conflicts. That raised the bar for a paid assistant: it has to do something beyond drafting the reply you asked it for.

How we ranked: We scored each tool on draft quality and how closely drafts match your voice, triage (whether it decides what you need to see), which mailboxes it supports, the price for one person and for a team, and what the vendor says about training models on your mail. We drew on vendor documentation, pricing pages, security pages and published reviews, checked in September 2026. We did not run a hands-on bake-off for this edition.

The seven tools compared

1. Superhuman Mail

Superhuman Mail takes the top spot because its automatic drafting is the furthest along of anything here: available on every Business and Enterprise account, backed by published usage numbers, and built into a fast client that works with both Gmail and Outlook.

What works: Split Inbox and Auto Labels sort mail into categories as it arrives, and Auto Summarize puts a short summary above long threads. The feature that justifies the bill is Auto Drafts, relaunched in July 2026 on a mix of Anthropic and OpenAI models. It picks out the emails that need an answer and writes a reply in your tone before you open them, sometimes with alternate versions when more than one answer makes sense, and it takes its style from your sent mail. Superhuman co-founder Rahul Vohra told TechCrunch that in testing, 40% of auto drafts were sent within a day, and 60% of those went out with no edits. Ask AI answers questions about your own mail, such as what a supplier last said about a delivery date. The Business plan adds CRM integrations with HubSpot, Salesforce and Pipedrive.

What doesn't: It's expensive, and the two features most people buy it for, Auto Drafts and Ask AI, aren't in the $25 Starter plan. You need Business, at $33 a user a month on annual billing. There's no free plan, and no support for plain IMAP accounts, so Fastmail, iCloud and self-hosted mail are out. The drafts also need reading. TechCrunch's reviewer found them answering pitches with a yes by default and agreeing to a meeting after midnight, until corrected.

Best for: Founders, sales leads and anyone whose job runs through the inbox, provided they'll learn the keyboard shortcuts.

Price: Starter is $25 a user a month and Business is $33, both billed annually ($30 and $40 billed monthly). Enterprise pricing is custom.

2. Gmail with Gemini

Gmail with Gemini is second because it's free and it's already where most people read their email. Any paid Gmail assistant has to beat it first.

What works: Since January 8, 2026, three Gemini features have been free for every Gmail user: Help Me Write, which drafts an email from a prompt or cleans up one you've written; AI Overviews, which summarize a long thread; and Suggested Replies, one-click responses meant to sound like you. A Google AI Plus, Pro or Ultra subscription adds the ability to ask your inbox questions in plain language, plus Proofread for grammar and tone. For businesses, Gemini has been included in Google Workspace Business plans since January 2025, and Google says Workspace content isn't reviewed by people or used to train generative AI models outside your domain without permission.

What doesn't: It's Gmail only, and the free features help you write a reply you've already decided to send. AI Inbox, the part that sorts mail and pulls out to-dos for you, reached most Google AI Plus, Pro and Ultra subscribers by June, but on Workspace it's still limited to Enterprise Plus customers in Google's Gemini Alpha program. Business accounts have generally waited: asking your inbox questions reached Workspace through Gemini Alpha in February and only came to all Business and Enterprise plans in September. Proofread got there faster, in February. New features also arrive in the US and in English first.

Best for: Anyone on Gmail who wants drafting and summaries without paying for or learning a new app.

Price: The core features are free. Google AI Plus costs $9.99 a month and Google AI Pro $19.99. Workspace Business plans, which include Gemini, start at $7 a user a month on an annual plan.

3. Outlook with Copilot

Copilot in Outlook is the obvious choice for a company already on Microsoft 365, and since April it's also the most ambitious assistant on this list.

What works: Copilot Chat comes with a Microsoft 365 work account at no extra cost and covers drafting and summarizing in Outlook. The paid tier goes further. In April 2026 Microsoft started rolling out an agent mode for Outlook, through its Frontier early-access program, that ranks your email, flags what needs a response, drafts follow-ups, sets up rules to keep clutter out, and reschedules calendar conflicts without being asked. For smaller companies, Copilot Business costs $21 a user a month for organizations of up to 300 people, cut to $18 for the first year on annual plans bought before the end of 2026.

What doesn't: Copilot in Outlook only works on mailboxes hosted on Exchange Online. Add a Gmail or IMAP account to Outlook and Copilot won't touch it, unless you also have a Microsoft 365 Personal, Family, Premium or Pro subscription, or a work account with a paid Copilot license, and even then not in classic Outlook for Windows. The agent features are still a Frontier preview: they need a paid Copilot license and an admin who has opted the company in, they aren't available in the EU, and Microsoft hasn't said when they'll be generally available. And Microsoft's own Q&A forum has a steady run of threads from people whose Copilot button disappeared from Outlook.

Best for: Companies that run on Microsoft 365 and want the assistant managed from the same Microsoft 365 admin center as everything else.

Price: Copilot Chat is included with Microsoft 365 work accounts. Copilot Business is $21 a user a month, or $18 for the first year on annual plans bought by December 31, 2026. Bundles run $23.50 with Business Standard and $32 with Business Premium, billed annually.

4. Shortwave

Shortwave is the best pick for Gmail users who want a new client designed around its AI assistant.

What works: Search is the reason to switch. You can ask Shortwave's assistant a question across up to five years of mail on the Business plan, and with no limit on Premier and Max. AI filters label, star or archive incoming mail using rules you write in plain English, and the assistant drafts replies from the thread and your history. The top Max plan runs on Claude Opus. Shortwave's sister product, Tasklet, launched in October 2025 and hooks the inbox up to agent automations across thousands of other apps. On privacy, Shortwave says most of its AI runs on open-source models on hardware it controls, and that your data will never be used to train third-party models.

What doesn't: It works only with Gmail and Google Workspace. Microsoft 365 and Exchange accounts aren't supported. The workaround for other providers is forwarding mail into Gmail, which works fully for Yahoo, iCloud and Fastmail, but can't send from an Outlook.com address. It's also priced like a premium product: the cheapest plan is $30 a seat, with a daily cap on AI requests (roughly 150 to 300 a day on Business) and only three AI filters. Getting more filters and a smarter model means $45 or $120 a seat.

Best for: Gmail-based teams who search their email more than they write it.

Price: A 14-day free trial, then Business at $30, Premier at $45 and Max at $120 a seat a month.

5. Fyxer AI

Fyxer AI is for people who don't want a new email app. It works inside Gmail or Outlook, sorts incoming mail into folders, and leaves drafted replies waiting for you.

What works: Fyxer rebuilt its plans at the end of September. Pro is the plan that sorts and drafts: one inbox with sorting, drafted replies in your tone and meeting notes, so follow-up emails can draw on what was said on the call. Team adds several inboxes at once, pooled credits and team reporting. A new Free plan has a daily briefing and chat, but it doesn't sort or draft. Its security page lists SOC 2 Type II, ISO 27001 and GDPR compliance, and its pricing page offers HIPAA on Enterprise.

What doesn't: Fyxer rates 4.0 out of 5 on Trustpilot across about 740 reviews, and the low-star ones repeat the same complaints: important mail filed where people couldn't find it, drafts that needed rewriting before they were usable, and charges after canceling. The trial turns into a paid plan automatically, so set a reminder. Paid plans now run on monthly credits after an unlimited first three months, and sorting is the first thing to pause when credits run out. Anyone running more than one inbox has to pay for Team, and Enterprise has a 50-user minimum.

Best for: People on Gmail or Outlook who want the sorting and drafting without changing how they read email.

Price: Free, with a 14-day trial of the paid plans. Pro is $37 a person a month billed annually ($49 monthly), Team is $64 ($99 monthly), and Enterprise is priced on request.

6. Spark

Spark from Readdle is the cheapest way to get a full email client with AI built in, and the only pick here whose AI works across Gmail, Outlook, iCloud and plain IMAP accounts in one inbox.

What works: Spark +AI, included in the paid plans, writes and rewrites emails, suggests quick replies, summarizes threads, translates, and takes meeting notes (40 a month on Plus, unlimited on Pro). The Pro plan lets the AI assistant work with your full email history. The client's Smart Inbox groups newsletters and notifications away from mail from people.

What doesn't: The free plan only gets a limited preview of the AI assistant. Every paid plan draws on a monthly AI quota, and meeting transcriptions come out of the same pool as your drafts and summaries, so heavy users can run out and have to buy more. Auto-Drafts, which prepares a reply to mail from real people before you open it, needs the Pro plan and is still rolling out in phases on desktop, with iOS in a closed beta.

Best for: People with several email accounts from different providers, and anyone who wants AI help for under $10 a month.

Price: Free, then Plus at $8.25 a user a month billed annually ($10 monthly) and Pro at $16.58 ($20 monthly). Enterprise pricing is custom.

7. SaneBox

SaneBox is on this list for triage, the half of email most people need the most help with, and it connects to more kinds of mailbox than anything else here.

What works: SaneBox works on the mail server, so it runs behind whatever app you already use. It learns which mail matters to you and moves the rest out of the inbox into separate folders. BlackHole blocks a sender for good, Daily Digest summarizes the unimportant mail you haven't opened, and Reminders tell you when someone hasn't replied. It supports Gmail, Microsoft 365, iCloud, Yahoo, Fastmail, Exchange and any IMAP server. It also offers Reply Draft, which writes replies in your tone and leaves them in your Drafts folder, usually within 10 to 15 minutes of an email arriving.

What doesn't: It won't answer questions about your mail or rewrite what you've written. Reply Draft only comes on plans that include SaneBox's AI features, and the cheapest plan, Snack, covers one account and makes you pick just two features. Dinner, which has everything and covers four accounts, is $42.99 a month, or $26.58 a month billed annually.

Best for: Anyone whose problem is volume rather than writing, especially on a provider the AI-first tools don't support.

Price: A 7-day free trial. Snack is $9.49 a month billed monthly, $5.42 a month billed annually and $4.54 a month on a two-year plan.

Didn't make the cut

Notion Mail shut down on September 22, 2026, 17 months after launch. Any list still recommending it hasn't been updated.

Lindy was a common pick for automated email handling. Its homepage now pitches an AI teammate that works across Slack and a company's other tools, which is a different purchase from an email assistant.

Perplexity Email Assistant drafted replies, labeled priorities and scheduled meetings in Gmail and Outlook. It launched in September 2025 for Perplexity Max subscribers, at $200 a month, and Perplexity now says it will soon be deprecated in favor of Computer, which handles email you forward or cc to it.

Front and Missive are shared team inboxes for support and operations teams, with AI on top. They're built for a team answering customers from one shared address, so someone clearing their own inbox would pay for a lot they'd never use.

Inbox Zero is open source and works with Gmail and Outlook. Self-hosting is free for personal use, though companies with five or more users need a commercial license, and the hosted plans start at $18 a user a month billed annually ($20 monthly).

How to choose an AI email assistant

Start with your mailbox. This rules out more tools than anything else. On Gmail, everything here except Copilot works. On Microsoft 365, Shortwave and Gmail's Gemini features are out. On iCloud, Fastmail or a company IMAP server, Spark and SaneBox are the only picks here that bring their AI to those accounts directly. Copilot can too, but only in new Outlook with a paid Microsoft 365 Personal or Family plan or a Copilot license.

Decide whether you need writing or sorting. If the problem is that you can't find the five emails that matter among 200, you want triage (SaneBox, Superhuman's Split Inbox, Copilot's agent mode). If you find the emails and then spend an hour answering them, you want drafting, and automatic drafting in particular (Superhuman Business, Fyxer Pro, Spark Pro, SaneBox's AI plans).

Price the tier you'll actually use. The feature that sold you is usually one plan up from the advertised price. Superhuman's Auto Drafts start at $33, not $25; Fyxer's second inbox needs Team, at $64; Shortwave's better model starts at $45.

Read the data policy. Every one of these tools reads all your email. Google says Workspace content isn't used to train generative AI models outside your domain without permission, Shortwave says your data won't train third-party models, and Fyxer publishes its certifications. If a vendor won't say, treat that as the answer.

Frequently asked questions

What's the best AI email assistant in 2026?

Superhuman Mail is our pick for most people who'll pay for one. It works with Gmail and Outlook, sorts the inbox, and on its Business plan drafts replies in your voice before you open the email. If you don't want to pay, Gmail's built-in Gemini features are the best free option.

Is there a free AI email assistant?

Yes. Help Me Write, thread summaries and Suggested Replies are free for every Gmail user as of January 2026. Copilot Chat is included with Microsoft 365 work accounts. Spark has a free plan, though its AI is limited to a preview.

Which AI email assistants work with Outlook?

Superhuman, Fyxer AI, Spark and SaneBox all support Outlook accounts, and Copilot is built into Outlook for mailboxes on Exchange Online. Shortwave doesn't support Microsoft 365 or Exchange, and Outlook.com mail can only be forwarded in, with no sending from that address.

Do AI email assistants train on your emails?

It depends on the vendor, so check before connecting an inbox. Google says Workspace content isn't used to train generative AI models outside your domain without permission, and Shortwave says your data will never be used to train third-party models. Consumer Gemini has looser terms than Workspace.

Can an AI email assistant reply to emails for me automatically?

Most of them draft and wait. Superhuman, Fyxer and SaneBox all write replies ahead of time (Spark Pro's version is still rolling out), but you still press send. Outlook's agent mode goes further on follow-ups and rules, and it's still a preview for paid Copilot users. We wouldn't let any of them send without a read.