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9 AI Email Assistants That Draft Replies and Clear Your Inbox

Draft replies, sort mail and summarize threads in less time.

Jhanvi Shah Oct 31, 2026, 10:45 AM IST 4 min read

AI email assistants cover showing an inbox with an AI drafted reply

Key Takeaways

Free plans: Shortwave, Fyxer, Spark
Best for teams: Missive
Rupee pricing: Outlook
Cleans any inbox: SaneBox

The 9 best AI email assistants in 2026 help you sort your inbox, summarize long threads and draft replies, so you spend less time on email.

Top 9 AI email assistants at a glance

Tool	Best for	Free plan
1. Superhuman	Fast, polished inbox	No free plan listed
2. Shortwave	AI search and writing	Yes
3. Fyxer AI	Drafts in your tone	Yes
4. Spark Mail	Mail on every device	Yes
5. Gmail with Gemini	Gmail users	Gmail is free; Gemini needs an eligible plan
6. Outlook with Copilot	Outlook users	Yes, free Outlook account
7. SaneBox	Decluttering any inbox	No, 7-day free trial
8. Mailbutler	Tracking and follow-ups	No, 14-day free trial
9. Missive	Team shared inboxes	No, 30-day free trial

Jump toSuperhuman Shortwave Fyxer AI Spark Mail Gmail with Gemini Outlook with Copilot SaneBox Mailbutler Missive

The 9 best AI email assistants in 2026

1. Superhuman

Superhuman homepage, one of the best AI email assistants — Superhuman website, October 2026

Superhuman is a premium email app built around speed, with AI built in. The Business plan adds auto drafts and Ask AI, so it suits busy founders who live in email.

Best for: Fast, polished inbox
Free plan: No free plan listed
Price: Starter $25 and Business $33 per member a month, billed annually
Website: superhuman.com

2. Shortwave

Shortwave homepage showing an AI email agent, one of the best AI email assistants — Shortwave website, October 2026

Shortwave lets you organize, schedule, write and search email with a prompt. Paid plans add AI search, summaries and autocomplete, and every paid plan starts with a 14-day free trial.

Best for: AI search and writing
Free plan: Yes
Price: Pro $18 and Business $30 per seat a month; Premier $45 and Max $120 are higher tiers
Website: shortwave.com

3. Fyxer AI

Fyxer AI homepage, a free AI email assistant for Gmail and Outlook, one of the best AI email assistants — Fyxer AI website, October 2026

Fyxer sorts and labels your inbox and drafts replies in your tone. You can sign up with a Google or Microsoft account, and the Team plan comes with a 14-day free trial.

Best for: Drafts in your tone
Free plan: Yes
Price: Pro $37 a person a month billed annually ($49 billed monthly)
Website: fyxer.com

4. Spark Mail

Spark Mail homepage, one of the best AI email assistants — Spark Mail website, October 2026

Spark is a smart inbox app for Mac, iOS, Windows and Android. Its Spark +AI tools write, reply to and summarize email, and Plus and Pro include a seven-day free trial.

Best for: Mail on every device
Free plan: Yes
Price: Plus $10 and Pro $20 a month on monthly billing
Website: sparkmailapp.com

Gemini in Gmail is a side-panel assistant that can summarize long threads, draft and refine emails, search your mail and propose meeting times from Google Calendar. It needs an eligible Google Workspace or Google AI plan.

Best for: Gmail users
Free plan: Gmail is free; Gemini needs an eligible plan
Price: Listed on Google's Workspace and Google AI plan pages
Website: workspace.google.com/products/gmail

6. Outlook with Copilot

Outlook with Copilot page, an AI email assistant for Outlook, one of the best AI email assistants — Outlook with Copilot website, October 2026

Copilot in Outlook summarizes long email threads, drafts messages and coaches your writing. Microsoft lists rupee prices for its Microsoft 365 plans in India.

Best for: Outlook users
Free plan: Yes, free Outlook account
Price: Microsoft 365 Basic ₹1,499 a year; Personal ₹6,899 a year
Website: microsoft.com/outlook

7. SaneBox

SaneBox homepage, one of the best AI email assistants for decluttering — SaneBox website, October 2026

SaneBox cleans up your inbox and sorts what matters, and it works with every email client. The 7-day free trial needs no credit card.

Best for: Decluttering any inbox
Free plan: No, 7-day free trial
Price: Snack from $4.54 a month billed every 2 years; Lunch $7.46; Dinner $22.04
Website: sanebox.com

8. Mailbutler

Mailbutler homepage, one of the best AI email assistants — Mailbutler website, October 2026

Mailbutler adds email tracking, templates, tasks and AI Smart Assistant tools such as Smart Compose, Smart Replies and Smart Summarize. The 14-day free trial includes all features and needs no credit card.

Best for: Tracking and follow-ups
Free plan: No, 14-day free trial
Price: Starter $4, Professional $7, Smart $11, Business $24 per user a month with yearly billing
Website: mailbutler.io

9. Missive

Missive homepage showing a team inbox, one of the best AI email assistants — Missive website, October 2026

Missive is a shared inbox for teams that run on email, with assignments, internal threads and AI editing. You can try it free for 30 days without a credit card.

Best for: Team shared inboxes
Free plan: No, 30-day free trial
Price: Starter $14, Productive $24, Business $36 per user a month billed yearly
Website: missiveapp.com

Free AI email assistants

Shortwave, Fyxer AI and Spark Mail each list a free plan, and Outlook has a free account. SaneBox, Mailbutler and Missive offer free trials instead.

Final verdict

Pick Gmail with Gemini or Outlook with Copilot if you already live in one of them. Choose Fyxer AI, Shortwave or Spark Mail for a free start, and Missive if your team shares an inbox. Try two for a week and keep the one that saves you time.

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Frequently Asked Questions

What is the best free AI email assistant?

Shortwave, Fyxer AI and Spark Mail each list a free plan on their pricing pages. Outlook also has a free account. Start with one of these, then upgrade only if you need the paid AI features.

Which is the best AI email assistant for Gmail?

Gmail with Gemini works inside Gmail. Fyxer AI lets you sign up with a Google account. Shortwave and Spark Mail are separate email apps, so check their sites for the accounts they connect.

Which is the best AI email assistant for Outlook?

Outlook with Copilot works inside Outlook. Fyxer AI also lets you sign up with a Microsoft account. Check each other tool's site for Outlook support before you subscribe.

Which AI email assistants charge in rupees?

Outlook with Copilot lists rupee prices, with Microsoft 365 Basic at ₹1,499 a year on Microsoft's India page. The other tools in this guide show prices in dollars on their pricing pages.

Which AI email assistants support Hindi?

None of the official pages used for this guide list Hindi support, so check each tool's language list before paying. Google publishes a supported languages page for Gemini in Workspace apps such as Gmail.

What is the cheapest AI email assistant?

Mailbutler Starter at $4 a user a month with yearly billing and SaneBox Snack at $4.54 a month billed every 2 years are the lowest dollar prices listed here. Spark Mail Plus is $10 a month.

Which AI email assistants have a free trial?

Shortwave offers a 14-day trial on paid plans, Fyxer AI a 14-day trial on its Team plan, Spark Mail 7 days, SaneBox 7 days, Mailbutler 14 days and Missive 30 days.

Which AI email assistants are best for teams?

Missive is built for teams with shared inboxes and assignments. Fyxer AI has a Team plan with shared spaces, and Shortwave sells per-seat Business plans.

How to use AI to write email replies faster?

Pick a tool that drafts replies, such as Fyxer AI, Superhuman or Spark Mail. Connect your inbox, review each draft, edit the tone if needed and send. Always read the draft before sending.

How to clear a cluttered inbox with AI?

Try SaneBox, which sorts email and works with every email client. Start the 7-day free trial, connect your account and let it separate important mail from the rest.

How to summarize long email threads with AI?

Use Gemini in Gmail or Copilot in Outlook, which both list thread summaries. Open the thread, ask the assistant for a summary and check the key points against the original messages.

How to start with an AI email assistant for free?

Sign up for the free plan of Shortwave, Fyxer AI or Spark Mail. Connect one inbox, test drafting and sorting for a week, then decide whether a paid plan is worth it.