Last updated: November 13, 2026
Superhuman is the top AI email assistant for speed-focused professionals in 2027, Shortwave is the best AI-first client for Gmail, and Gemini in Gmail and Copilot in Outlook are the easiest picks for teams already on Google Workspace or Microsoft 365. Fyxer stands out for drafting replies that sound like you.
AI email assistants sort the inbox, summarize long threads and prepare replies. The best choice depends on whether your problem is volume, prioritization or writing time.
AI Email Assistants To Use In 2027
| Assistant | Best For | Core Strength | Category |
|---|---|---|---|
| Superhuman | Executives and power users | Keyboard speed plus AI drafts | Email client |
| Shortwave | Gmail users | AI assistant that searches and acts | Email client |
| Gemini in Gmail | Google Workspace teams | AI inside the existing inbox | Built-in AI |
| Copilot in Outlook | Microsoft 365 organizations | Summaries and coaching in Outlook | Built-in AI |
| Fyxer AI | Founders and busy professionals | Draft replies in your tone | Inbox assistant |
| SaneBox | Inbox overload | Filters low-priority mail automatically | Inbox filter |
| Spark Mail | Individuals and small teams | Affordable AI across devices | Email client |
| Missive | Teams sharing inboxes | Collaboration plus AI drafting | Shared inbox |
How We Scored
We scored assistants on triage quality, reply drafting, thread summaries, search, supported providers, privacy and security, and price.
The Top AI Email Assistants
1. Superhuman
Superhuman pairs split inboxes and shortcuts with AI that writes in your voice and answers questions about your mail.
It works with Gmail and Outlook accounts.
Best for: Executives and power users. Core strength: Keyboard speed plus AI drafts.
2. Shortwave
Shortwave reworks Gmail with bundles, summaries and an assistant that drafts, searches and schedules.
It puts AI at the center rather than the edge.
Best for: Gmail users. Core strength: AI assistant that searches and acts.
3. Gemini in Gmail
Gemini summarizes threads, drafts replies and answers questions across Gmail and Drive.
No new app or migration is needed.
Best for: Google Workspace teams. Core strength: AI inside the existing inbox.
4. Copilot in Outlook
Copilot summarizes threads, drafts and tunes emails and helps prepare for meetings using Microsoft 365 data.
It is the natural choice for Microsoft shops.
Best for: Microsoft 365 organizations. Core strength: Summaries and coaching in Outlook.
5. Fyxer AI
Fyxer sorts the inbox and prepares drafts ready for review, and it also takes meeting notes.
It works alongside Gmail or Outlook.
Best for: Founders and busy professionals. Core strength: Draft replies in your tone.
6. SaneBox
SaneBox learns what matters and moves the rest to folders with daily digests.
It works with almost any provider.
Best for: Inbox overload. Core strength: Filters low-priority mail automatically.
7. Spark Mail
Spark offers a smart inbox, AI writing and summaries on every major platform.
It is a budget-friendly upgrade.
Best for: Individuals and small teams. Core strength: Affordable AI across devices.
8. Missive
Missive combines shared inboxes, internal comments and AI drafting.
Support and operations teams avoid duplicate replies.
Best for: Teams sharing inboxes. Core strength: Collaboration plus AI drafting.
Check How Your Mail Is Used
Before connecting a business inbox, read each vendor’s data policy, including whether email content is used to train models and where it is stored. Enterprise plans usually offer stronger guarantees.
Frequently Asked Questions
What is the best AI email assistant?
Superhuman is best for speed, Shortwave for Gmail users and Gemini or Copilot for teams already on Google or Microsoft.
Can AI write emails in my style?
Yes. Superhuman and Fyxer learn from sent mail to draft replies that sound like you.
Is there a free option?
Some tools have free tiers, and many Workspace and Microsoft 365 plans include AI features.
Conclusion
Pick Superhuman for speed, Shortwave for Gmail power users and Gemini or Copilot to stay in your current inbox. Choose based on whether volume, triage or writing costs you the most time.
