12 Best AI Email Assistants in 2026

Fyxer works inside the inbox you already use. You sign in with a Google or Microsoft account, and it starts labeling incoming mail by what it needs from you, then writes reply drafts in your tone that wait in the thread for you to edit and send.

Meetings are the other half of the product. Fyxer can record calls, write notes, and keep a running follow-up list, so the email you’d normally write after a meeting is often drafted before you get back to your desk. On the Team plan, Flows automate repeated steps, and shared spaces let a team keep client notes together.

The free plan includes 400 credits a month. Pro is $37 per user a month on annual billing, and the company raised a $30M Series B in September 2025, which counts for something when you’re giving a startup access to your inbox.

On security, Fyxer lists SOC 2 Type II, ISO 27001, and GDPR compliance, with HIPAA on Enterprise.

Our take: The best all-round pick if you live in Gmail or Outlook and also spend half the day in meetings. It’s pricier than writing-only tools, so if you only want help with replies, MailMaestro or Ellie cost less.

Standout features:

• Automatic labels that sort mail by priority and type
• Reply drafts in your tone, saved in the thread
• Meeting recording, notes, and follow-up drafts
• Flows and shared spaces on the Team plan

Superhuman is now the name of the company behind Grammarly. It renamed itself in October 2025, and in November, 2026, it launched Email Assistant, which runs inside your existing Gmail or Outlook account. You don’t need to move to the Superhuman Mail app to use it.

Email Assistant does four jobs.

1. Auto Labels sorts incoming mail.
2. Auto Drafts writes replies in your voice using your calendar and web research.
3. Auto Reminders nudges you about threads waiting on a reply.
4. Auto Archive clears low-value mail and sends you a daily recap of what it removed.

Email Assistant is part of the Superhuman Pro plan, which also includes Grammarly’s paid writing features and Superhuman Go, an assistant that works in other apps and browser tabs. The Superhuman Mail client, known for its keyboard shortcuts and split inbox, is in the Business plan.

Superhuman is SOC 2 Type 2 certified and GDPR compliant, and that your email is never used to train external AI models.

Our take: The closest rival to Fyxer at about a third of the price, and the obvious choice if your team already pays for Grammarly.

Standout features:

• Auto Labels, Auto Drafts, Auto Reminders, and Auto Archive
• Daily recap of archived mail
• Grammarly writing tools and Superhuman Go in the same plan
• Superhuman Mail client on the Business plan

If you use Gmail, you already have an AI email assistant. Maybe you didn’t use it, yet?

Google gives every Gmail user thread summaries, Help Me Write for drafting and rewriting, and Suggested Replies that adapt to how you write. That covers much of what people actually need.

Paid plans add more. A Google AI Pro subscription, $19.99 a month for personal accounts helps with your whole inbox and Proofread. On paid Google Workspace plans, AI Inbox started rolling out in October 2026 for US users. It shows suggested to-dos and topic summaries at the top of your inbox.

What Gemini doesn’t do is work unprompted. It won’t draft every reply in advance or label mail by priority on its own the way Fyxer or Superhuman do. It also only works in Gmail.

Our take: Try the free features before paying. Many people will find that Help Me Write and summaries are enough, and a dedicated assistant only makes sense if you want drafts and sorting to happen automatically.

Standout features:

• Thread summaries and Help Me Write for every Gmail user
• Suggested Replies personalized to your writing
• Inbox questions and Proofread with Google AI Pro
• AI Inbox with to-dos on paid Workspace plans (US English)

Sparkian isn’t connected to your inbox, and that’s worth knowing up front. It is an AI workspace that puts more than 100 models from OpenAI, Anthropic, Google, and others behind one subscription. For email, you paste in a thread or a rough draft and ask for a reply, a shorter version, or a different tone.

The reason it’s on this list is model choice.

Sparkian can send one prompt to GPT, Claude, Grok, and Gemini side by side, so you can compare multiple versions of a delicate email and keep the one that reads best. You can also switch models in the middle of a conversation without losing the context, which helps when one model writes the facts well and another gets the tone right.

A knowledge base lets you upload documents such as pricing sheets, policies, or product notes, and the answers cite them. That’s useful for sales and support replies that need the right numbers. Web search, image generation, and a prompt library with ready-made writing prompts are included in the same workspace.

Our take: A good fit if you already pay for ChatGPT, Claude, or Gemini mainly for writing and want all of them in one place. It won’t sort your inbox or draft in the background.

Standout features:

• Side-by-side answers from GPT, Claude, Gemini, and other models
• Model switching that keeps the conversation and files
• Knowledge base with cited answers
• Prompt library, web search, and image generation

Some of the email that takes the most time isn’t in your inbox. If you send a regular newsletter, HeyNews drafts each issue for you. It studies your past issues to learn your tone, vocabulary, section structure, and favorite phrases, then writes the next issue from the stories you care about.

You add the sources you already read, such as RSS feeds, websites, subreddits, and social profiles. New stories arrive with a relevance score, and a Chrome extension lets you save anything else you come across. When it’s time to write, you pick the stories or let HeyNews choose, and it drafts the issue along with a subject line and preview text.

beehiiv and Kit connect directly, and HeyNews uses their click data to improve later drafts. HeyNews doesn’t publish on its own, so every issue goes out from your newsletter platform after you review it.

Our take: Worth a look for creators, companies, and agencies that spend hours a week assembling a newsletter. It’s priced by issues per month, so it suits a steady publishing schedule better than an occasional email.

Standout features:

• Voice Profile trained on your past issues
• Relevance-scored stories from feeds, sites, subreddits, and social profiles
• Drafts with subject lines and preview text
• Open and click data from beehiiv and Kit to improve drafts

Copilot is Microsoft’s answer to Gemini, and it’s already in Outlook for most business users. Copilot Chat, included with Microsoft 365 business subscriptions, can summarize threads, draft replies, and answer questions about your mail, calendar, and meetings. Email coaching reviews a draft for tone and clarity before you send it.

You can ask Copilot to pin, flag, archive, or mark messages as read in your language, and you can create inbox rules by describing them. A more agentic version that triages your inbox and manages your calendar for you was released recently.

Microsoft says Copilot doesn’t use your data to train its foundation models, and it runs inside your Microsoft 365 tenant with the same permissions and compliance settings as the rest of your mail. Feature availability differs between business plans and Microsoft 365 Personal or Family.

Our take: The default choice for companies on Microsoft 365, since IT teams can manage it like the rest of Office. People on Gmail, or individuals who want drafts written automatically, are better off to other tools on this list.

Standout features:

• Thread summaries, reply drafts, and email coaching
• Inbox triage and rules in plain language
• Answers grounded in your mail, calendar, and meetings
• Inbox and calendar agent in Frontier early access

Shortwave replaces the Gmail interface with its own app for web, Mac, Windows, iOS, and Android. You can search years of mail by asking a question, set up AI filters that sort mail by rules you write in English, and get summaries and autocomplete as you type.

The assistant runs on Anthropic’s Claude models, and higher plans get more capable ones and larger usage limits. Personalized writing learns how you write, and AI search can read up to 100 threads per question on Premier.

The big limit is that Shortwave needs a Gmail or Google Workspace account to sign in. Microsoft 365 and Exchange aren’t supported, and Outlook.com only works by forwarding mail to a Gmail address.

Our take: One of the strongest AI email clients for Gmail users who want search and filtering to feel modern.

Standout features:

• Ask-anything AI search across your mailbox
• AI filters written in plain English
• Personalized writing, autocomplete, and summaries
• Tasklet automations for drafts and 3,000+ apps

Spark from Readdle is one of the few AI email apps that works with almost any provider, including Gmail, Outlook, iCloud, and IMAP accounts. It runs on Mac, Windows, iOS, and Android, and its Smart Inbox groups newsletters and notifications away from mail from people.

Spark +AI drafts and rewrites messages and summarizes threads, with a monthly quota on Plus. Pro adds Autopilot and Auto-Drafts, which prepare replies on their own, plus unlimited meeting notes and a command-line tool. +AI is off by default, so nothing is sent to an AI model until you turn it on.

Our take: The best value if you manage several accounts across providers and want one app for all of them. The free plan only gives a preview of the AI assistant.

Standout features:

• Unified inbox for Gmail, Outlook, iCloud, and IMAP
• Smart Inbox that separates people from newsletters
• Spark +AI for drafting, rewriting, and summaries
• Autopilot and Auto-Drafts on Pro

Inbox Zero is an open-source AI email assistant with more than 13,000 stars on GitHub. It sorts and labels mail, drafts replies in your voice, blocks cold emails, prepares briefs before meetings, and bulk-unsubscribes you from newsletters you never read.

Because it is open source, you can run it on your own server and keep mail data under your control. The hosted version is simpler, with a free email client and AI features on paid plans after a 7-day trial.

Our take: The pick for developers and privacy-minded teams who want to see and control how their email AI works. The hosted plans cost about the same as Superhuman.

Standout features:

• Automatic sorting and labels
• Reply drafts in your voice
• Cold email blocker and bulk unsubscribe
• Meeting briefs and a self-hosting option

Jace connects to Gmail or Outlook, labels incoming mail, and prepares reply drafts for you to review. It doesn’t send anything by default. Flows go further, automating multi-step jobs that involve tools like Slack, Notion, and HubSpot, and MCP integrations let it pull context from other apps when it writes.

Jace says it doesn’t train on user data. The 7-day trial needs a card.

Our take: A solid middle option between a writing add-on and a full assistant like Fyxer, especially for people whose email work depends on other tools.

Standout features:

• AI labels and reply drafts for review
• Flows with Slack, Notion, and HubSpot
• Follow-up reminders
• MCP integrations for outside context

MailMaestro is an add-on for Outlook and Gmail that helps you write. You can compose a message from a bullet points, reply to a thread, or improve a draft by changing its tone, length, or clarity.

It also summarizes long threads and takes meeting notes, and its AI agents can label mail, draft replies, and follow up.

Our take: A good choice if you mainly want help rewriting emails professionally and work in Outlook, where it installs as a native add-in. The free plan is only three requests a week.

Standout features:

• Compose, reply, and improve from inside the email
• Thread summaries and meeting notes
• AI agents that label, draft, and follow up
• Native add-in for Outlook and Gmail

Ellie writes email replies in your voice, either on demand through a browser extension and Outlook add-in or automatically on its Business plan. It replies in any language and uses a knowledge base you train with your own documents.

Roles let you set up different personas, for example one for support replies and one for sales. Ellie has also grown beyond email, with Ellie Docs for writing help center articles from your product’s code and Ellie Desk for answering customer support requests.

Our take: A good fit for small teams that answer similar questions every day and want those answers grounded in their own documents. Solo users on the $19 plan get the extension only, so automatic drafts start at $39.

Standout features:

• Reply drafts in your tone, in any language
• Knowledge base training with your documents
• Roles for different types of replies
• Browser extension and Outlook desktop add-in