Which AI email assistant should your business use?

What does an AI email assistant do?

• Sorts your inbox: It labels mail by priority and moves newsletters and cold pitches out of the way.
• Drafts replies: It writes a reply in your tone, ready for you to check and send.
• Sums up threads: It turns a long back-and-forth into a few lines.
• Finds things: You ask a question, such as "what did the supplier quote last month?", and it searches your mail.
• Helps with meetings: Some tools draft scheduling replies or take meeting notes.

Most assistants leave drafts for you to send. That is the safe setup. An email sent in your name with a wrong date or price is hard to take back.

How do the main AI email assistants compare?

Assistant	Works with	Price (October 2026)	Best for
Gemini in Gmail	Gmail on Google Workspace	Included in Workspace Business plans, which start at $7 per user a month	Teams already on Google Workspace
Copilot in Outlook	Outlook on Microsoft 365	Copilot Business add-on at $25.20 per user a month, or $21 a month on a yearly plan (a current offer prices it at $18 in the first year)	Teams already on Microsoft 365
Superhuman	Gmail and Outlook	Business plan at $40 per member a month, or $33 billed yearly	People who handle a lot of email themselves
Fyxer	Gmail and Outlook	Pro plan at $49 per person a month, or $37 billed yearly	Owners who want most replies drafted, plus meeting notes

Gemini in Gmail

Google lists Gemini in Gmail on its Business Starter, Standard and Plus plans. Its pricing page shows Business Starter at $7 per user a month, Business Standard at $14 and Business Plus at $22. Google says Gemini helps you find, summarize and write emails faster. If your team already pays for Workspace, try Gemini first, because it costs nothing extra.

Copilot in Outlook

Microsoft sells Microsoft 365 Copilot Business as an add-on for existing Microsoft 365 business customers. It costs $25.20 per user a month on monthly billing, or $21 a month on a yearly plan. A current offer prices the yearly plan at $18 a month for the first year, though Microsoft's page does not give an end date for it, so check before you budget around it. It also sells bundles, such as Business Standard with Copilot at $23.50 per user a month, paid yearly.

Microsoft says Copilot in Outlook drafts emails and sums up long email threads. Microsoft also includes Copilot Chat at no extra cost with eligible Microsoft 365 plans.

Superhuman

Superhuman Mail works with Gmail and Outlook. Its AI features include Auto Drafts, which writes replies using your inbox, calendar and the web. It also has Auto Labels, which sorts mail by priority, and Auto Archive, which clears out marketing mail and cold pitches. Mail comes with the Business plan at $40 per member a month, or $33 a month billed yearly. The cheaper Pro plan does not include Mail.

Fyxer

Fyxer connects to Gmail and Outlook. It drafts replies in your tone, labels your inbox and takes meeting notes. The Pro plan costs $49 per person a month, or $37 a month billed yearly. The Team plan costs $99 per person a month, or $64 billed yearly. Fyxer's pricing page shows that some features use credits, so check how many credits your inbox will need.

Which AI email assistant should you choose?

• Choose Gemini if: your business runs on Google Workspace and you want help without another bill.
• Choose Copilot if: your business runs on Microsoft 365 and you want AI inside Outlook.
• Choose Superhuman if: you handle a lot of email yourself and care most about speed and a clean inbox.
• Choose Fyxer if: you want drafts ready for most emails and meeting notes in the same tool.

Before you pick, run a two-week test on your real inbox. Count how many drafts you send with few or no changes. That count tells you more than any feature list.

Is it safe to give AI access to your email?

An AI email assistant reads your mail. That can include client data, contracts and bank details. Before you connect one, check these points:

• Where your data goes: Ask whether the vendor stores your emails and for how long.
• Training: Ask whether your emails are used to train AI models.
• Admin control: On a team, make sure an admin can turn the tool on and off for each person.
• Rules for your trade: Law firms, medical practices and financial firms have extra duties to protect client data. Check those duties before you connect any tool.

Keep the assistant on "draft only" at first. Let it send emails by itself only for simple, low-risk replies.

What mistakes do people make with an AI email assistant?

• Turning on auto-send too early. Start on draft-only, always. An email sent in your name with the wrong date, price or tone is far harder to walk back than a draft you catch before sending.
• Not checking data retention and training terms before connecting. Your inbox holds client data, contracts and sometimes financial details. Know where that goes and whether it trains someone else's model before you connect anything.
• Treating every trade the same. A general AI email assistant was not built with your specific confidentiality duties in mind. Law firms, medical practices and financial firms need to check their own rules before connecting one, not after.

How is email automation different from an AI assistant?

An AI assistant helps a person write and sort email. Email automation runs whole tasks with no person involved.

Simple automation is already in your inbox. Gmail filters and Outlook rules can label, forward or archive mail by sender or subject. Tools such as Zapier go further. For example, they can save every invoice attachment to a folder and add a row to a spreadsheet.

AI adds a new layer. An AI agent can read an email, work out what it is about, and act on it. For example:

• Order emails: It reads a purchase order and creates the order in your system.
• Support inbox: It answers common questions and passes the rest to a person.
• Supplier quotes: It pulls prices from supplier emails into one comparison sheet.
• New leads: It replies to a new lead within a minute, asks a few qualifying questions and books a call.

My guides on business process automation and AI customer service agents cover these jobs in more depth.

When does a custom AI email tool make sense?

For one person's inbox, buy a ready-made assistant. The tools above do that job well.

A custom tool makes sense when:

• A shared inbox drives your work: Orders, bookings, claims or support requests arrive by email every day.
• Email has to update other systems: The details need to land in your CRM, job software or accounting tool.
• Replies need your own data: Answers depend on stock levels, prices or account status that a general assistant cannot see.
• Seat fees add up: Twenty staff on a $40 plan cost $800 a month, every month.
• You need tight control of data: Your rules may require that emails stay in systems you control.

How would Blur Studio approach email automation?

I look at one inbox at a time. I sort a week of emails into types and count how many of each come in. That shows which tasks are worth automating.

If a ready-made assistant covers the job, I tell the client to use it. If not, I build an AI agent for that inbox. It reads each email, checks the business's own data, drafts or sends the reply, and updates the right system. A person approves anything risky. The code and the accounts belong to the client.