9 Best AI Email Assistants of 2026

Shortwave rebuilds the inbox around an AI assistant rather than adding a sidebar to an old client. The Business plan at $30 per seat per month gives you an assistant that can load up to 50 threads into one search, AI-powered search across five years of mail, three AI filters that act on new email from a plain-language prompt, instant summaries on every message and autocomplete that learns your writing style from what you send. Premier at $45 doubles AI usage, removes the search history limit and raises AI filters to ten. The assistant can also browse the web, read attachments, check your calendar and draft scheduling emails. Organization tools include splits, bundles for newsletters and promotions, delivery schedules and todos, and teams get shared threads, comments and assignees. The tradeoffs are price and metering: there is no cheap paid tier, and daily AI usage is capped by a quota that varies with request complexity. Shortwave is built for Gmail and Google Workspace accounts.

Spark Mail is the low-cost route to AI in a full email client. The free plan already sorts mail with Smart Inbox and connects unlimited accounts, so you can try the workflow before paying. Plus costs $8.25 per user per month billed annually ($99 per year) and turns on Spark +AI: a writing assistant that drafts, translates, summarizes and proofreads, quick AI replies, email summaries and an AI Assistant that can find and summarize emails, attachments, meeting notes and events across a year of history. Plus also includes 40 AI meeting notes a month. Pro at $16.58 billed annually adds the features busy inboxes want most: Auto-Drafts written in your voice, Autopilot rules that organize and forward mail, unlimited meeting notes and read statuses. AI features draw on a monthly quota, and Spark +AI must be switched on in settings. One subscription works across iOS, Android, Mac and Windows.

Canary Mail is the budget and privacy pick. Its Growth plan costs $3 per month billed yearly at $36 and adds AI Copilot to an email client that runs on Mac, Windows, iOS and Android. Copilot covers the three jobs busy people want: prioritized inbox tabs, drafting and replying, and summaries of what you are reading, plus natural-language search. Canary says triage and prioritization run on your device and keep working offline for downloaded mail, while drafts and summaries use hosted models with a commitment that your email is never used to train generalized AI models. Growth also adds read receipts, send later, calendar scheduling and an inbox cleaner. Pro+ at $100 per year adds PGP encryption, HIPAA-oriented SecureSend and phishing and impersonation detection. The limits are that there is no monthly plan, licenses are for one user, and the free plan does not include the AI features. A 7-day trial needs no credit card.

Fyxer AI suits people who do not want to change email apps. It connects to Gmail or Outlook, sorts incoming mail into labels such as To respond, FYI and Marketing, and writes draft replies in your tone that wait in your drafts for review. Pro costs $37 per person per month billed annually ($49 monthly) and adds video meeting recording, a drafted follow-up email after each meeting and a follow-up list that keeps itself current. Team at $64 per person billed annually adds shared spaces, assigned follow-ups and team reporting. Usage runs on credits: after a launch offer of unlimited credits for three months, Pro includes 3,000 credits a month per paid member, and sorting costs one credit per five emails. The free plan keeps a daily briefing and audio meeting notes but does not draft replies or label mail, so the core inbox features need a paid seat. Every sign-up starts with a 14-day Team trial.

Gemini in Gmail is the default choice for organizations already paying for Google Workspace, because the AI sits inside the inbox people use every day. Google documents three core jobs: summarizing long threads, with buttons for detailed summaries, next steps and action items; Help me write, which drafts a full email from a short prompt and can pull details from a Google Drive file; and contextual Smart Reply suggestions. Gemini can also rewrite and polish drafts and answer questions about a topic or a specific sender. It is available on desktop and mobile for business and personal accounts. What it does not offer is the automation of dedicated assistants: there are no prompt-based filters, automatic labels or replies drafted in the background. We could not confirm US dollar Workspace pricing from our location, so check Google's pricing page for the current per-user cost before you buy.

Superhuman Mail is built for people who live in email and measure their day in replies. On the Business tier of the Superhuman suite, Mail adds a full set of AI automation: Auto Drafts, Auto Labels, Auto Archive, Auto Reminders and Auto Summarize, plus Write with AI that matches your voice and tone and one-click Instant Reply. Split Inbox separates team, VIP and tool notifications so urgent mail does not bury important mail, and follow-up reminders fire if nobody replies. Teams get shared conversations, comments, shared drafts and read statuses, and sales users can view HubSpot, Salesforce and Pipedrive records inside the inbox. For people who want to stay in Gmail or Outlook, Superhuman also sells Email Assistant, which sorts mail and drafts replies inside those apps. The catch is cost: Mail is bundled into the higher paid suite tier, and we could not confirm a US dollar price from our location, so check the plans page.

For companies that already run on Microsoft 365, Copilot in Outlook is the path of least resistance. Microsoft describes it as a way to catch up on email, draft responses and manage your calendar, and the same Copilot Business license also works in Word, Excel, PowerPoint and Teams, with AI chat grounded in your work data and pre-built research and analysis agents. The add-on was listed at $18 per user per month paid yearly when we checked, down from $21, and $25.20 on monthly billing. Microsoft also sells bundles: Business Standard with Copilot at $23.50 and Business Premium with Copilot at $32 per user per month paid yearly. The tradeoff is that Copilot is a general work assistant, not an email specialist: Microsoft does not document prompt-based inbox filters or replies drafted automatically in the background the way Shortwave or Fyxer AI do. Business plans also top out at 300 users.

SaneBox is a sorting tool, not a writing tool, and that is its appeal. It connects to your email account on the server side, so it works with any email client, and filters messages by importance, moving low-priority mail into SaneLater and learning where to file things as you correct it. Email Deep Clean purges thousands of old messages in minutes, SaneBlackHole stops a sender for good, SaneNoReplies tracks unanswered threads and a Daily Digest shows what was filtered. The Snack plan costs $4.54 per month billed every two years and covers one account with two power features; Lunch at $7.46 covers two accounts and six features; Dinner at $22.04 covers four accounts and every feature. The gap for busy professionals is drafting: SaneBox does not write replies or summarize threads with generative AI, so it pairs best with Gemini, Copilot or a writing tool if you want both.

Ellie does one thing: write replies. Connect a Gmail or Outlook mailbox on the Business or Professional plan and it drafts responses into your Drafts folder in the background, or trigger it on demand from the browser extension or the Outlook desktop add-in. It replies in any language and copies your tone, and knowledge base training lets you upload PDFs and documents or point it at a website, which helps support and sales inboxes that answer the same questions daily. Roles let one person keep separate tones and knowledge for support, sales or founder email. Casual costs $19 per month for 25 extension-powered replies a day; Business at $39 adds auto-draft, auto-categorise and 3 seats; Professional at $79 removes the daily reply cap and connects up to 3 accounts per user. Ellie does not summarize threads or offer a full email client, and it will not write cold outreach.