Table of Content
What is an AI email assistant?
An AI email assistant is software that reads your inbox and helps you handle it. It sorts messages by importance, summarizes long threads, drafts replies in your tone and can search your mail in plain language. The best ones work inside Gmail or Outlook, and none should send anything important without your review.
The short version
- Pick by where you read email. Gmail users should look at Gemini first. Outlook users should look at Copilot first. Both are built into the apps you already use.
- Dedicated tools go further. Superhuman, Fyxer, Shortwave and Spark add drafting, sorting and shared inboxes, and most cost $10 to $40 per person each month.
- Sorting and drafting are different jobs. A sorter such as SaneBox cleans your inbox. A drafter writes replies. Know which one you need.
- Review before sending. AI drafts can miss context or invent details. Keep approval on for clients, contracts and money.
- Check the data policy. Your inbox holds private information. Confirm what the vendor stores and whether it trains on your mail.
- Need something custom? We build email agents that sort, draft and route messages inside your own systems. See our AI automation service.
What an AI email assistant can do
Most assistants combine four jobs. They triage, which means sorting mail into groups such as urgent, newsletters and receipts. They summarize, which turns a long thread into a few lines. They draft, which writes a reply from your notes or your past messages. And they search, which finds a contract or a date when you ask in plain words.
The best AI email reply tools also learn your tone from past messages. Some work like an AI executive assistant for your inbox, handling scheduling and follow-ups.
Some tools also act on your behalf, such as scheduling a meeting from an email or filing an invoice. That is the point where an assistant becomes an agent, and where careful limits matter most. If you are new to the idea, our guide to AI agent examples shows what agents do in real businesses.
9 AI email assistants worth a look
The list starts with tools built into the email apps you already use, moves to dedicated apps and ends with general chat assistants and custom builds. Features and plans change quickly, so confirm details on each vendor’s page.
1. Gemini in Gmail
Google has added Gemini features to Gmail. As reported in January 2026, thread summaries and Help Me Write are available to all users, while proofreading and questions about your whole inbox need a paid Google AI plan. An AI Inbox that highlights important messages was still in limited testing at that time.
It is the simplest way to try AI on email, because there is nothing to install.
Choose it if you live in Gmail and want help without a new app. Watch for feature tiers. What is free and what is paid has changed more than once.
2. Microsoft Copilot in Outlook
Copilot adds a Summarize button to long threads, a drafting option when you compose and coaching that suggests changes to tone and clarity. It can pull context from the thread and, depending on your setup, from your organization.
Some features need a Microsoft 365 Copilot license on top of your normal plan, so confirm with Microsoft or your IT admin before you plan around it.
Choose it if your company runs on Microsoft 365. Watch for licensing. Check which features your plan includes.
3. Superhuman
Superhuman is a fast email app for Gmail and Outlook with a split inbox, AI-written drafts, quick replies and automatic labels. Its published plans were listed at about $30 a month for Starter and $40 for Business, and some AI features sit on the higher plan.
Choose it if you handle a heavy inbox and value speed. Watch for price. It costs more than most tools on this list.
4. Fyxer AI
Fyxer works with Gmail and Outlook. Its own pages say it sorts new mail into labels, drafts replies based on your past conversations and offers a meeting notetaker. Plans were reported to start around $30 a month, with a free trial.
Most details come from the vendor, so test it on your own mail before you commit.
Choose it if you want sorting and drafts done in the background. Watch for vendor claims about zero-edit drafts. Judge by your own results.
5. Shortwave
Shortwave is an email app built around AI. It shows a one-line summary of each thread, lets you ask questions about a conversation, drafts replies and supports natural-language search, such as “find the contract from last month”. It also bundles related mail like receipts and newsletters.
Independent sources describe it as Gmail-focused, so check support for your mail provider.
Choose it if you use Gmail and want AI search and summaries. Watch for provider support. Verify that it works with your account.
6. Spark
Spark is a mail app with a smart inbox and AI features for composing, replying and summarizing. Its AI Assistant is opt-in and searches an index of your mail kept on your device. The maker lists a free plan, Plus at about $10 per user per month and Pro at about $20, with shared inboxes on Pro.
Choose it if your team shares an inbox and wants a low price. Watch for plan limits. AI history and meeting notes vary by plan.
7. SaneBox
SaneBox works as an AI email organizer and focuses on one job: sorting. It learns which senders matter and moves the rest into folders so your inbox shows only important mail. It does not write your replies. Plans were reported to start at about $7 a month.
Choose it if your inbox is cluttered and you want it quiet. Watch for expectations. It cleans mail but does not draft or summarize.
8. A general chat assistant
You can paste a thread into ChatGPT, Claude or Gemini and ask for a summary or a draft. It is flexible and often free to start, and it works with any email app.
The cost is the copy and paste, and the privacy risk. Do not paste confidential client details into a tool without a business data agreement.
Choose it if you only need occasional drafts. Watch for sensitive data. Use a business plan with clear data terms for work email.
9. A custom email agent
A custom agent connects your inbox to your own systems. It can read a support request, look up the order in your store, draft an answer using your policies and put the draft in front of a person for approval. It can also sort leads to your CRM or file invoices to your accounting tool.
This fits when off-the-shelf tools cannot see your data or follow your rules. Our agentic AI development and AI integration teams build these, and our guide on how to build an AI agent explains the steps.
Choose it if email drives a repeatable business process. Watch for sending without review. Keep approval on until the agent has earned trust.
AI email assistants compared
| Tool | Works with | Best for | Listed price (as reported) |
|---|---|---|---|
| Gemini in Gmail | Gmail | Quick summaries and drafts | Core features free; some need a paid Google AI plan |
| Copilot in Outlook | Outlook | Microsoft 365 teams | Needs a Copilot license for some features |
| Superhuman | Gmail, Outlook | Speed and heavy inboxes | About $30 to $40 per month |
| Fyxer AI | Gmail, Outlook | Background sorting and drafts | From about $30 per month |
| Shortwave | Gmail (verify others) | AI search and summaries | Free and paid plans |
| Spark | Several providers | Shared team inboxes | Free; about $10 to $20 per user per month |
| SaneBox | Several providers | Sorting only | From about $7 per month |
| Chat assistant | Any (copy and paste) | Occasional drafts | Free and paid plans |
| Custom agent | Your systems | Repeatable email workflows | Scoped per project |
Prices are monthly figures reported in October 2026 and change often. Confirm them on each vendor’s page.
How to choose the right one
- Start with your email app. If you use Gmail or Outlook, try the built-in AI first. It costs nothing to learn and may be enough.
- Name the job. Is your problem a cluttered inbox, slow replies or lost information? Sorting, drafting and search are different tools.
- Check privacy. Ask what the tool stores, whether it trains on your mail and what security reports the vendor can share.
- Count the seats. A tool at $30 per person adds up quickly for a team. Compare with a shared-inbox plan.
- Test on real mail. Run a one-week trial on your own messages and count the drafts you sent with few edits.
Safe rules for AI and your inbox
- Keep a human in the loop for clients, contracts, refunds and anything legal.
- Check facts. A draft may mention a date, price or promise that was never in the thread.
- Limit access. Give the tool only the mailboxes and folders it needs.
- Watch for tone. Replies that sound off-brand can cost trust. Save a few of your own emails as examples.
- Review the results monthly. Look at what the assistant sorted and drafted and fix the rules.
If email is one part of a bigger process, such as booking calls or qualifying leads, connect it to the rest of your workflow. Our guides to AI workflow automation tools and appointment scheduling software show how.
Frequently Asked Questions
How do you use AI to help with email?
Use it for four jobs: sorting mail by importance, summarizing long threads, drafting replies and searching your inbox in plain language. Start with the AI built into Gmail or Outlook, then test a dedicated tool if you need more.
What is the best AI email assistant?
It depends on your email app and your problem. Gmail users can start with Gemini, and Outlook users with Copilot. Dedicated apps such as Superhuman, Fyxer, Shortwave and Spark add more drafting, sorting and team features.
Is there a free AI email assistant?
Yes. Gmail’s Gemini features include free thread summaries and drafting help, Spark has a free plan, and general chat assistants such as ChatGPT, Claude and Gemini have free tiers. Paid plans add limits, features and stronger privacy terms.
Does Outlook have an AI assistant?
Yes. Copilot in Outlook can summarize a thread, draft a reply and suggest changes to tone and clarity. Some features need a Microsoft 365 Copilot license, so check your plan or ask your IT admin.
Which AI works best with Gmail?
Gemini works inside Gmail itself. Third-party apps such as Superhuman, Fyxer, Shortwave and Spark also connect to Gmail and add features like automatic labels, shared inboxes and natural-language search.
Can AI reply to emails automatically?
Some tools can send replies on their own, but most businesses should not allow it for important mail. A safer setup drafts the reply and waits for a person to approve it, with auto-send only for simple, low-risk messages.
Is it safe to let AI read my email?
It can be, if you choose carefully. Ask what the vendor stores, whether it trains on your mail, how it handles access and what security reports it holds. Avoid pasting confidential content into tools that lack a business data agreement.
What is the difference between an AI email assistant and an AI email writer?
An email writer produces text from a prompt. An assistant works inside your inbox, so it can sort mail, summarize threads, search past messages and draft replies with the context of the conversation.
How much do AI email assistants cost?
Built-in options can be free or part of a paid plan. Dedicated apps are often reported between about $7 and $40 per person each month. Custom agents are priced per project because the work depends on your systems.
Can I build my own AI email assistant?
Yes. A custom agent can read incoming mail, look up information in your systems, draft a reply and route it for approval. It makes sense when your email supports a repeatable process that ready-made tools cannot see.
Bottom Line
The right AI email assistant is the one that fits your inbox and your risk level. Try the AI in Gmail or Outlook first, move to a dedicated tool if you need more, and keep approval on for anything that matters.
If email feeds a larger process in your business, we can build an agent that connects your inbox to your systems. Explore our AI automation service, or compare more tools in our list of AI tools for small business.
