The best AI email assistant is the one that works inside the inbox you already use. Gemini in Gmail and Superhuman suit Gmail users, Microsoft Copilot suits Outlook, Lavender and HubSpot suit sales teams, Front and Help Scout suit support inboxes, and Shortwave or SaneBox suit anyone who wants a standalone helper.
Most people don't need a new email app. They need help with the one that's open all day.
That's why I'd choose an AI email assistant by inbox rather than by feature list. A clever tool that makes you switch email clients is easy to abandon after a couple of weeks. A decent one that sits where you already work gets used every day. So find your inbox below and start there.
Before you pick, check two things. First, where your email lives: Google Workspace, Microsoft 365 or another provider. Second, what slows you down most: writing replies, finding things or wading through noise. Those two answers point straight to the right section.
If you live in Gmail
Gemini in Gmail
Google's Gemini is built into Gmail for Google Workspace users. It can draft replies with its "Help me write" feature, summarise long threads and pull information from across your inbox. What's included depends on your Workspace plan, so check your current options.
Superhuman
Superhuman is a fast email client that works with Gmail and Outlook accounts. It's known for keyboard shortcuts, a focus on speed and AI features that draft replies and help you get through your inbox. It suits people who handle a lot of email and want to clear it quickly.
If you live in Outlook
Microsoft Copilot
Copilot in Outlook can draft emails, summarise threads and coach you on tone and clarity. Because it sits inside Microsoft 365, it can also draw on your calendar and files, depending on how your business is set up. It's also handy for catching up after time off, when a summary saves you reading every message in a long thread. If your team runs on Microsoft, I'd start here before trying anything else.
If you're in sales
Sales email is where AI helps most and can hurt most. It gets you to a decent first message fast, but if every message reads like the same polished template, prospects notice. Use these tools to sharpen your own message, not to replace it.
Lavender
Lavender is an email coach for sales outreach. It scores your emails as you write and suggests changes to make them shorter, clearer and more personal. It works inside Gmail and Outlook, so there's no new inbox to learn.
HubSpot's AI email tools
If HubSpot is already your CRM, its AI writing tools can help draft sales emails and follow-ups inside the platform. The benefit is context: the assistant sits next to the contact record and the deal, not just the email in front of you. If you use a different CRM, check whether it has similar AI writing features before adding another tool.
If you run a support inbox
Support email is a team job, so the best tools here help several people share one inbox without tripping over each other.
Front
Front is a shared inbox for teams, with AI features that help draft replies, summarise conversations and route messages to the right person. It suits businesses where several people answer the same inbox. Because the whole team sees the same conversations, a colleague can review an AI draft before it goes out.
Help Scout
Help Scout is a help desk with AI features for drafting and improving replies, summarising long conversations and answering questions from your help articles. It suits small support teams that want a friendly customer experience without a heavy setup.
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If you want a standalone helper
Shortwave
Shortwave is an AI-first email client built for Gmail. It can summarise, draft replies, search your inbox in plain English and group messages so the important ones come first. If you like Gmail but want AI that feels built in from the start, it's worth a look.
SaneBox
SaneBox doesn't write emails. It sorts them. It learns which messages matter to you and moves the rest into separate folders, so your inbox shows what needs your attention. It works with most email providers, which makes it useful whatever you use. It's a good first step if your problem is volume rather than writing.
What I'd never hand to an AI assistant
AI is great for first drafts and summaries. But some emails carry your reputation, and those stay with you.
- Bad news. Price changes, delays, refunds and apologies need your words and your judgement.
- Anything legal, financial or medical. Check the facts with your accountant, solicitor or the right professional, and write it yourself.
- Replies to upset customers. AI can help you cool down your own first draft, but the reply should come from you.
- Sending without reading. Never let an assistant send on your behalf without checking the draft first.
- Confidential information. Check how a tool handles your data before you connect an inbox full of client details, and follow the data protection rules your business is under.
- Relationships that matter most. Your best clients can tell when they're getting a template.
A simple rule: if you'd be embarrassed for the recipient to know a tool wrote it, write it yourself. Use AI for the first draft, the summary and the sorting, and keep the final word for you.
Quick comparison
| Your inbox | Tools to try | Best at |
|---|---|---|
| Gmail | Gemini in Gmail, Superhuman, Shortwave | Drafting, summaries and speed |
| Outlook | Microsoft Copilot, Superhuman | Drafting and summaries inside Microsoft 365 |
| Sales | Lavender, HubSpot | Sharper outreach and follow-ups |
| Support | Front, Help Scout | Shared inbox replies and summaries |
| Any provider | SaneBox | Sorting, so important mail comes first |
If you're not sure where to begin, start with whatever's already included in the email platform you use, try it for two weeks, and only then look at a specialist tool.
Make an AI email assistant? See how to get it featured on this list.
If you'd rather build a simple routine than buy a new tool, my guide to an AI email reply system for small businesses shows how to set one up, and my post on using an AI email writer to save time on client replies has prompts you can copy. For newsletters and campaigns rather than one-to-one email, see the best AI email marketing tools.
Frequently asked questions
What is the best AI email assistant?
The best one works inside the inbox you already use. Gemini suits Gmail, Microsoft Copilot suits Outlook, Lavender suits sales emails, and Front or Help Scout suit support teams.
Is there an AI email assistant for Outlook?
Yes. Microsoft Copilot works inside Outlook for Microsoft 365 users, and Superhuman also works with Outlook accounts.
Can an AI email assistant send emails for me?
Some can, but I'd always read every draft and send it myself, especially to clients.
Is it safe to connect my inbox to an AI tool?
Check how the tool stores and uses your data, and follow the data protection rules your business is under before you connect it.
