AI Email Assistants

Comparison

Tool	Best for	Pricing
Fyxer AI	Busy professionals who want inbox triage and reply drafting without switching email clients	$30/user/month (Starter, billed monthly) or $22.50/user/month billed annually
Gemini in Gmail	Gmail and Google Workspace users who want AI drafting and summarization without adding a third-party tool	Included with Google Workspace Business Standard and higher plans; also available via a Google AI subscription for personal Gmail accounts
Microsoft Copilot in Outlook	Organizations already on a qualifying Microsoft 365 plan who want AI email features without adding a new vendor	$18/user/month (Microsoft 365 Copilot Business add-on, billed annually; promotional rate through September 2026, regular price $21/user/month); the no-seat-limit Enterprise add-on is $30/user/month annual. A limited Microsoft 365 Copilot Chat remains available at no extra cost to eligible existing Microsoft 365 subscribers.
SaneBox	Anyone who wants inbox decluttering without switching email clients or exposing message content to a third party	$7/month (Snack tier, standard monthly billing)
Shortwave	Gmail and Google Workspace users who want a rebuilt, AI-first interface without leaving Google's ecosystem	$30/seat/month (Business, billed monthly)
Superhuman	Sales professionals, founders, and executives who live in their inbox and want the fastest possible email experience	$40/month (Business, billed monthly — the entry tier for Mail access)

Reviews

Fyxer AI

An AI email assistant that layers on top of Gmail or Outlook to automatically triage your inbox, draft replies in your writing style, and take notes on meetings — without replacing your existing email client.

Gemini in Gmail

Google's AI assistant built directly into Gmail, offering thread summaries, AI-drafted replies, and inbox filtering — this page covers the Gmail-specific Gemini features, not the standalone Gemini chat app.

Microsoft Copilot in Outlook

Microsoft's AI assistant inside Outlook: drafts and coaches replies, summarizes threads, and prioritizes your inbox — the email-specific Copilot, not Microsoft 365 Copilot Chat.

SaneBox

A privacy-conscious email filtering tool that learns which senders matter to you and automatically moves low-priority messages out of your inbox, using mostly message headers rather than full content.

Shortwave

An AI-native email client built specifically on top of Gmail and Google Workspace, centered on a conversational AI assistant, natural-language search, and automation filters.

Superhuman

A premium, speed-focused AI-native email client for Gmail and Outlook accounts, built around keyboard shortcuts and AI drafting, summarizing, and triage.

Frequently asked questions

Should I switch to a full AI email client, or add AI to Gmail/Outlook?

Switching to a client like Superhuman or Shortwave gives you the deepest AI integration and speed, but requires changing your daily workflow and paying a dedicated subscription. Add-on tools like Fyxer or SaneBox, and built-in assistants like Copilot in Outlook or Gemini in Gmail, let you keep your existing inbox and interface while getting most of the practical benefit — triage, drafting, and summarization — with far less disruption.

Is it safe to let an AI tool read and draft my email?

Reputable vendors use encryption, publish security certifications (SOC 2, ISO 27001, GDPR compliance), and state they don't use your email content to train shared models without permission — but policies differ meaningfully between tools. SaneBox is unusual in that it works mostly from message headers rather than full content. Always check a vendor's current privacy policy before connecting a work or sensitive inbox, especially if you handle regulated or confidential information.

Do I need Microsoft 365 Copilot or Google Gemini if I already pay for a tool like Superhuman or Fyxer?

Not necessarily. If your organization already has a qualifying Microsoft 365 or Google Workspace plan, the built-in assistant may cover your core needs (drafting, summarizing, prioritizing) at no extra cost. Third-party tools tend to go further on speed, personalization, and cross-platform triage, so the decision usually comes down to whether the built-in assistant's depth is enough for how you actually work.

Will an AI email tool actually save me time, or just add another tool to manage?

For people with genuinely high email volume — sales, customer-facing roles, executives, founders — the time saved on drafting and triage is usually real and significant. For lighter email users, the setup and learning curve of a new client or add-on can offset the benefit; in that case, the free AI features already built into Gmail or Outlook are often enough.

Can these tools send email on my behalf without review?

Most default to drafting for your review rather than auto-sending, and this is the safer default for anything outward-facing. Some tools offer more autonomous or agentic modes for routine replies, but these are typically opt-in and best reserved for low-stakes, high-volume situations rather than turned on by default.

Full AI email client vs. a layer on your current inbox

The first choice is bigger than any feature: do you replace your email client, or add AI to the one you already use? A full AI-native client rebuilds the inbox around AI and tends to give the deepest integration and the most speed. The trade-off is a new interface, a dedicated subscription, and time spent relearning how you work. For some people that’s worth it; for many it isn’t.

The lighter path is to keep your existing inbox and bolt AI onto it — triage, auto-drafting, or smart filtering that runs on top without asking you to migrate. You give up some depth and polish, but adoption is far easier, especially across a team that doesn’t want to switch clients. Neither approach is better in the abstract; the right one depends on how much of your day email actually eats and how much change you’re willing to absorb to claw some of it back.

How to choose the right AI email assistant

Once you’ve settled the replace-or-add question, a few practical points decide the rest:

• Replace your client, or add to it? This one choice drives cost, migration effort, and how much your team has to relearn, so make it first and let it narrow the field.
• Check what you already pay for. If you’re on a business plan of a major email suite, an AI assistant may already be bundled in. Confirm what’s included before buying a third-party tool.
• Triage, drafting, or both? Some tools focus on cleaning up what reaches you; others focus on writing the replies. Be honest about which part is actually eating your time.
• How much of your email does it read? Tools differ in whether they process full message content or work mostly from headers and metadata. That gap matters a lot for a sensitive or regulated inbox.
• Price it at your real team size. Per-seat costs that look cheap for one person scale quickly. Check the tier that matches how many people will actually use it, not the entry plan.

How AI changes email work

Doing email by hand means carrying all of it yourself: reading every message, deciding what matters, and typing each reply from scratch. AI shifts that load. It sorts the inbox so the things that need you surface first, hands you a drafted reply to edit instead of a blank field, and boils a long back-and-forth thread down to a few lines you can act on. The repetitive middle of email — the routine acknowledgments, the “circling back,” the same reply with small tweaks — is exactly what it’s good at.

The limit is that a drafted reply is still only a draft. The model can misjudge tone, get a detail wrong, or write something fluent that isn’t quite what you meant, and it saves little time on messages you’d have to review word-for-word anyway — legal, sensitive, or high-stakes email. That’s why most tools default to drafting for your review rather than sending on their own, and why that’s the setting to keep. Let it handle the sorting and the first pass; keep the send button under your control.