Best AI Email Assistant for Work: AI Email Assistant Tools for Gmail and Outlook, Compared
Six AI email assistants compared on what they actually do, what they cost per user, whether they work in Gmail or Outlook, and who each one is genuinely the right purchase for. Pricing verified from vendor pages on July 22, 2026.
In one answer
For most people, the best AI email assistant is the one already included in the suite you pay for: Gemini comes with every Google Workspace Business plan at no extra cost, and Microsoft 365 Copilot adds AI to Outlook for $18 per user per month on an annual commitment. Buy a separate tool only when you need something they do not do: Shortwave for AI search across years of mail, Missive for shared team inboxes, or Officeagent when the problem is the work behind the email rather than the writing of it.
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Start here: which problem are you actually buying for?
The phrase "AI email assistant" covers three different products, and most bad purchases come from buying the wrong one. Sort yourself into a category first and the shortlist gets very short.
The first category is writing help. It drafts replies, rewrites what you typed, summarizes a long thread, and finds the message you half-remember. This is what Gemini in Gmail and Copilot in Outlook do, and it is what most people mean when they ask the question. The important thing about this category is that if you already pay for Google Workspace or Microsoft 365, you probably already own it and should use it for a month before buying anything.
The second category is inbox triage: sorting, filtering, snoozing and surfacing, so you face fewer messages rather than answering them faster. Shortwave and dedicated filtering tools live here. The third category is the one people describe but rarely shop for: the work the email is about. Scheduling the meeting the thread is negotiating, filing the attachment, chasing the person who never replied, updating the record the message referred to. A faster reply does not clear that queue. That is where a general office assistant fits rather than an email client.
Be honest with yourself about which one is costing you the hours. If you spend twenty minutes a day writing email, a writing assistant saves you maybe ten. If you spend two hours a day on the follow-through behind the email, a writing assistant does not touch it.
Gemini in Google Workspace: the default for Gmail users
If your company runs on Google Workspace, Gemini is included in your Business plan at no additional cost. It drafts and refines replies in Gmail, summarizes threads, and answers questions across your mail and Drive, with fuller access on Standard and Plus than on Starter. Google confirmed this on its pricing page as of July 22, 2026.
The reason it leads this list is not that it is the most capable assistant here. It is that it is free at the margin for a large share of the people searching this term, it is inside the client they already use, and it requires no new login, no new security review and no new vendor. Any paid alternative has to beat something you already own, which is a higher bar than most comparison articles admit.
Where it falls short: it is a writing and summarizing layer, not a triage system, and its recall across old mail is good rather than exceptional. If your inbox problem is volume rather than composition, this will not solve it.
Microsoft 365 Copilot: the default for Outlook users
Copilot is the Outlook answer, and it works the same way across Word, Excel, Teams and the rest of Microsoft 365. In Outlook it drafts replies in your voice, summarizes long threads and meeting invitations, and pulls context from files and chats you already have access to.
Pricing as of July 22, 2026, from Microsoft's own business page: $18 per user per month on an annual commitment, discounted from $21, or $25.20 per user per month on monthly billing. It is an add-on, so it requires an eligible Microsoft 365 Business license underneath it. That base license is the number people forget when they compare Copilot against a $20 standalone tool.
Note that the $18 figure is a promotional rate against a $21 list price, and Microsoft has moved this number more than once in the past year. If you are budgeting an annual commitment, check the price on the day you buy rather than trusting any article, including this one. We wrote a longer Copilot comparison and a buyer's take on whether Copilot is worth it for a small team.
Shortwave: the power user's AI inbox
Shortwave is a separate email client that sits on top of Gmail and rebuilds the experience around AI: an assistant that searches and reasons across your mail history, AI-built filters that route messages automatically, thread summaries, and autocomplete. It is the most genuinely AI-native product in this list.
Pricing verified at shortwave.com on July 22, 2026: Business at $30 per seat per month, Premier at $45, and Max at $120, all with a 14-day trial and no free tier. The tiers differ mainly on how much AI usage you get, how far back search reaches, and how many AI filters you can run. Business is capped at roughly 150 to 300 AI requests a day and five years of search history; Premier lifts that to unlimited history and double the usage.
Who it is for: someone whose job genuinely is their inbox, with years of mail worth searching and a real appetite for a new client. Who it is not for: a team that will not switch email clients. At $30 to $45 a seat it is also two to three times the price of the suite-included options, so the value has to come from the search and filtering, not the drafting.
Missive: when the inbox is shared
Missive solves a different problem: several people working one mailbox. Shared inboxes like support@ or billing@, internal discussion attached to a conversation instead of forwarded around it, assignment so two people do not reply to the same customer, plus SMS and social channels in the same place.
Pricing verified at missiveapp.com on July 22, 2026: Starter $14 per user per month for up to 5 users, Productive $24 for up to 50 users adding rules, automations and API access, and Business $36 for unlimited users with SSO and advanced reporting, with 20% off annual billing and a 30-day trial.
Its AI features are lighter than Shortwave's, and that is fine, because the reason to buy Missive is the collaboration model. If two or more people share a mailbox and currently coordinate by forwarding and hoping, this is the category you want and Missive is a strong pick in it. If you are one person with a busy inbox, it is the wrong product.
Superhuman: speed, at a price
Superhuman built its reputation on raw speed: keyboard-first navigation, aggressive triage, split inboxes, and more recently AI drafting and reply suggestions. People who love it really love it, and the productivity gain for heavy senders is real.
Pricing verified at superhuman.com on July 23, 2026, replacing the third-party estimate this page carried yesterday. Starter is $25 per user per month billed annually ($300 a year, against a $360 list), Business is $33 per user per month billed annually ($396 a year, against a $480 list), and Enterprise is quote-only. On monthly billing that works out to $30 and $40 per user. Business is the tier that carries the deeper AI: Ask AI, auto drafts, voice and tone matching, custom AI auto-labels, and the Superhuman Mail MCP connection.
Who it is for: individual heavy senders who will invest a week in learning the shortcuts and who value speed over cost. It is one of the more expensive per-seat options in the category, and its advantage is interaction design rather than AI depth.
Officeagent: when the problem is the work, not the writing
We build Officeagent, so read this section with that in mind. It is not an email client and it will not make you faster at typing replies. It is a general office assistant, and email is one of the things it handles.
The difference is what happens after the message. It drafts the reply, and it also books the meeting the thread was trying to arrange, files the attachment where it belongs, opens the task the sender asked for, and comes back three days later to chase the person who never answered. Every one of those actions is held for your approval before it happens, so nothing goes out in your name that you did not read. Pricing is per office rather than per seat: $149 a month for the Assistant plan and $399 a month for the Office plan covering up to ten people and 2,000 actions, with a 14-day money-back guarantee. It connects to Gmail and Outlook and works alongside whatever client you use.
Be clear about when it is the wrong answer. If your problem is that you write too slowly, buy the assistant in your suite and stop reading. If your problem is that you have four people in the same mailbox, buy Missive. Officeagent is for the office manager or founder whose real cost is the administrative tail behind the inbox. That case is laid out on the email assistant page, and the follow-through half of it on follow-ups. For the wider question of which assistant a small business needs at all, we compared the chat tools, the suites and the human options in the best AI assistant for small business roundup.
How to pick in ten minutes
Run this in order and you will land in the right place without a two-week evaluation.
Start by checking what you already pay for. If you are on Google Workspace or Microsoft 365 Business, turn on the assistant you already have (or price Copilot at $18 per user per month annually) and use it for four weeks. Most people stop here, and they should. Then, if the inbox is still the problem, name what is still hurting. Too many messages to sort means triage, so look at Shortwave. Several people in one mailbox means collaboration, so look at Missive. Speed of individual handling means Superhuman. Work piling up behind the messages means a general assistant rather than an email tool.
Whatever you shortlist, run the trial on your real mailbox rather than a test account, and measure one thing: how long you spend in email at the end of a normal week versus the start. Every tool here demos well. Only your own inbox tells you which one moves the number.
If the inbox is one of several fires rather than the only one, the wider view is worth ten minutes first: our roundup of the best AI tools for administrative assistants covers all six jobs on an admin desk and the order to buy them in, so you do not solve email at $33 a seat while the real bottleneck sits somewhere else.
- Already on Workspace or M365? Use the assistant you own for four weeks first
- Too many messages to sort: triage tool (Shortwave)
- Several people, one mailbox: collaboration tool (Missive)
- One heavy sender, values speed: Superhuman
- The work behind the email is the cost: a general office assistant
AI email assistants compared. Pricing checked at vendor pages July 22, 2026, with Superhuman re-checked at the vendor July 23, 2026.
| Tool | What it is for | Works with | Price (US, per user/mo) | Best for |
|---|---|---|---|---|
| Gemini in Google Workspace | Drafting, rewriting, thread summaries, search | Gmail | Included in Business plans at no extra cost | Anyone already on Google Workspace: try this first |
| Microsoft 365 Copilot | Drafting, summaries, context from Office files | Outlook | $18 annual (from $21), $25.20 monthly, plus a required M365 Business license | Anyone already on Microsoft 365 |
| Shortwave | AI search, AI filters, triage, summaries | Gmail (separate client) | $30 Business, $45 Premier, $120 Max | Power users with years of mail and a big inbox |
| Missive | Shared inboxes, assignment, internal discussion | Gmail, Outlook, IMAP, SMS, social | $14 Starter (max 5 users), $24 Productive, $36 Business, 20% off annual | Teams sharing one mailbox |
| Superhuman | Speed, keyboard-first triage, AI drafting | Gmail, Outlook | $25 Starter, $33 Business per user/mo billed annually ($30 / $40 monthly) | Individual heavy senders who want raw speed |
| Officeagent | Drafting plus the work behind it: scheduling, filing, tasks, chasing | Gmail, Outlook | $149/mo Assistant, $399/mo Office (up to 10 people), per office not per seat | Offices where the admin tail costs more than the typing |
Pricing
Assistant $149/mo · Office $399/mo · Enterprise from $1,500/mo
Office covers the whole team, up to 10 people, with the follow-up engine and CRM sync. Full limits on the AI assistant pricing page.
Questions on this
What is the best AI email assistant?
For most people it is the one already included in their suite: Gemini at no extra cost in Google Workspace Business plans, or Microsoft 365 Copilot in Outlook at $18 per user per month annually. Buy something separate only for a need those do not cover, such as AI search and filtering across a huge inbox (Shortwave), a shared team mailbox (Missive), or the administrative work behind the messages.
Is there an AI email assistant for Outlook?
Yes. Microsoft 365 Copilot is the native option, at $18 per user per month on an annual commitment as of July 2026, on top of a required Microsoft 365 Business license. Missive and Superhuman also support Outlook accounts, and general office assistants like Officeagent connect to an Outlook mailbox without replacing the client you use.
Is there an AI email assistant for Gmail?
Yes, and if you are on a Google Workspace Business plan you already have one: Gemini is included at no additional cost and drafts, rewrites and summarizes inside Gmail. Shortwave is the main paid alternative and rebuilds the Gmail experience around AI search and filtering, starting at $30 per seat per month.
How much does an AI email assistant cost?
The suite-included options are cheapest: Gemini is bundled with Google Workspace Business plans, and Copilot is $18 per user per month annually plus its base license. Standalone tools run $14 to $45 per user per month depending on tier, with Shortwave's top plan at $120. Per-office pricing like Officeagent's $149 to $399 a month can work out lower once more than a few people are involved.
Can AI write emails for me?
It can write the draft. Every tool here produces a usable reply from a short instruction or an existing thread, and the drafts are good enough that editing them is faster than writing from scratch. What you should not do is let anything send unreviewed on your behalf. Keep a human approval step on anything going to a client, a candidate or a regulator, because tone and commitments are where AI drafts go wrong.
What is the difference between an AI email assistant and an email client?
An email client is where you read and send mail. An AI email assistant is a layer that drafts, summarizes, searches or sorts. Some products are both (Shortwave and Superhuman are clients with AI built in), while others add AI to the client you already use (Copilot, Gemini) or work alongside it entirely (a general office assistant connected to your mailbox).
Do I need an AI email assistant if I already have Microsoft 365 or Google Workspace?
Usually not at first. Turn on what you already pay for and use it for a month. If the inbox still costs you real hours after that, the specific thing still hurting tells you what to buy: sorting volume points to a triage tool, shared handling points to a collaboration tool, and work piling up behind the messages points to a general assistant rather than a better email app.
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