Best AI Email Assistants in 2026: Fyxer, Jace, Superhuman & WhatsApp-First Options

You received over 200 emails this week and properly read maybe a third. The rest got skimmed, snoozed or missed, including at least one that mattered.

The AI email assistant category has split into three groups that solve genuinely different problems, and picking well means knowing which problem you have.

• Autonomous inbox managers (Fyxer, Jace) triage, label and draft across your whole inbox with minimal input.
• AI drafting copilots (Superhuman) make you faster at working inside the inbox.
• Messaging-first assistants (Coliflo) skip the inbox interface entirely and route what matters into a chat app you already check.

Quick verdict: Fyxer if you want hands-off inbox organisation across Gmail and Outlook, and meeting notes bundled in. Jace if you want an agent with smart rules and Slack integration on a credits model. Superhuman if raw speed inside the inbox matters more than automation. Coliflo if you are rarely at a desk and want important Gmail messages filtered into WhatsApp with a reply already drafted.

Fyxer: Best for Fully Autonomous Inbox Management

Fyxer runs on top of Gmail and Outlook, auto-categorising incoming mail into buckets such as To Respond, FYI and Marketing, drafting tone-matched replies, and sending an AI notetaker into video meetings. Once connected it works in the background rather than waiting for you to open a thread.

Fyxer AI Limited is a UK company founded in October 2023. It reports roughly 180,000 users and around $17M in run-rate ARR, and has raised about $40M across a Series A in March 2025 and a Series B in September 2025.

Pricing (September 2026): Starter $30/user/month, or $22.50 billed annually. Professional $50/user/month, or $37.50 annually, adding multiple inboxes, Fyxer Chat and a HubSpot integration. Enterprise is custom with a 50-seat minimum. There is a 7-day trial and no permanent free tier.

Best for: people who want to barely touch their inbox, and who also pay for a meeting-notes tool. Bundling both under one subscription is the strongest part of the pitch.

Limitations: it is built for desktop and browser inbox use, not a messaging workflow. Labels and notes are not especially tunable. And Fyxer stores email content in order to learn your style and categorise your mail.

Jace: Best for Task-Oriented, Credits-Based Automation

Jace is built by Zeta Labs, founded in 2023 by two former Meta engineers. It drafts replies before you open a thread, applies AI labels by type and priority, runs smart rules that auto-CC people or apply templates, and answers questions against your mail history. It integrates with Slack and can turn a message into a ticket elsewhere.

Worth knowing: Jace started as AWA-1, an autonomous web-browsing agent that drove a browser to book trips and fill forms. In 2026 it has narrowed to an inbox-focused assistant, so older descriptions of it as a computer-use agent are out of date.

Pricing (September 2026): roughly $20/month for individuals and $40/month for teams, billed per account rather than per seat. Plus includes 10,000 monthly credits and Pro 20,000, resetting each period, with the tier capping how many inboxes you connect.

Best for: people who work across email and Slack and want workflow automation rather than just better drafts.

Limitations: credits consumption is harder to forecast than a flat fee, and heavy use pushes you up a tier. Jace is Gmail-first. Its privacy policy permits some data retention for model improvement.

Superhuman: Best for Speed-Focused Email Power Users

Superhuman is a premium email client built around keyboard shortcuts, with AI drafting, summarisation and triage suggestions layered on. You are still making most of the decisions; the tool makes each one faster.

Grammarly acquired Superhuman in July 2025 and now bundles it into the Superhuman Suite alongside Grammarly and Coda. The standalone client continues under the same name.

Pricing (September 2026): Starter $30/month billed monthly or $25 annually. Business $40/month or $33 annually. No free plan.

Best for: power users who enjoy being in their inbox and want to move through it as fast as possible.

Limitations: it makes you faster at email; it does not make you do less email. You still read every message and write every reply.

WhatsApp-First: Best for Professionals Who Skip the Inbox

This is a different bottleneck from the three above. Fyxer, Jace and Superhuman all assume you will open your mailbox and compete on how pleasant that will be. A messaging-first assistant assumes you will not.

Coliflo connects Gmail to your personal WhatsApp. It filters incoming mail and forwards around 30% of it, leaving the rest unread in Gmail. Each forwarded email arrives as a WhatsApp message with a summary and a reply already drafted, matched to the language and register of the sender. You adjust the draft by texting back, then send, and the reply leaves from your own Gmail address with your signature. Coliflo users reply in a median of 3.5 minutes.

Pricing (September 2026): €24.90/month, everything unlimited. 7-day free trial, no card required.

Best for: professionals who spend their day away from a laptop. Tradespeople, real estate agents, consultants, sales reps, small business owners.

Limitations: Gmail only, Outlook is not supported. It requires a WhatsApp account. One subscription covers one inbox. And it does not do deep inbox reorganisation, labelling systems or calendar work.

Side-by-Side Comparison

Pricing verified September 2026 against each vendor's published pricing page.

The Question Nobody Asks: Where Does Your Email Go?

Every tool here reads your mail. What differs is what happens next.

Fyxer holds SOC 2 Type II, ISO/IEC 27001 and GDPR compliance, with HIPAA available for enterprise. It also stores email content, because style learning requires it. Jace states it has completed a SOC 2 Type 1 examination and holds CASA Tier 3 compliance, and its privacy policy permits some data retention for model improvement.

Both are defensible positions. Storing content is what makes a model sound like you.

Coliflo takes the other side of that trade: content is processed and not retained, it is not used to train models, attachments are never opened or sent to the AI, and the infrastructure runs in Switzerland with AES-256-GCM encryption and Google CASA certification for restricted OAuth scopes. The cost of that choice is that Coliflo learns your style less deeply than a tool that keeps your archive.

What this means: if you work under client confidentiality — legal, medical, financial, or simply a business where client correspondence should not sit in a vendor's training set — read each provider's retention policy before comparing features. It is the shortest section of every privacy page and the one that actually differs.

Which One Should You Actually Choose?

You live inside Gmail or Outlook and want the system to pre-sort everything. Fyxer. If you already pay separately for meeting notes, the bundle makes it cheaper than it looks.

You work across email and Slack and want rules and integrations. Jace, provided you are comfortable watching credit consumption.

You enjoy being in your inbox and want to move faster. Superhuman.

You are rarely at a desk and Gmail piles up unread until evening. Coliflo. This is a different problem: distance from the inbox rather than slowness inside it, and none of the other three solve it.

Client correspondence must not be retained by a vendor. Coliflo is the only option here that commits to no retention and no training, though check every policy yourself rather than taking any comparison's word for it.

FAQ

Which AI email assistant is best?

It depends on the bottleneck. Fyxer and Jace lead for autonomous, hands-off inbox management inside Gmail and Outlook. Superhuman leads for speed inside the inbox. Coliflo leads for professionals who want Gmail handled from WhatsApp without opening an inbox at all.

How much do AI email assistants cost in 2026?

Fyxer is $30/user/month for Starter and $50 for Professional. Jace runs roughly $20/month for individuals and $40 for teams on a credits model. Superhuman is $30/month for Starter and $40 for Business. Coliflo is €24.90/month with everything unlimited. None has a permanent free tier, though most offer a trial.

Is there a free AI email assistant?

No mainstream tool in this category has a permanent free tier in 2026. Fyxer, Superhuman and Coliflo all offer trials instead. Coliflo's is 7 days with no card required, Fyxer's is 7 days. Google Workspace subscribers already have Gemini drafting features included at no extra cost, which covers basic drafting without a separate tool.

Which AI email assistants store my email content?

Fyxer stores email content in order to learn your writing style and categorise mail. Jace's privacy policy permits some retention for model improvement. Coliflo processes messages without retaining them and does not use customer content to train models. Policies change, so verify on each provider's current privacy page.

Which AI email assistant works with Outlook?

Fyxer and Superhuman both support Gmail and Outlook. Jace is Gmail-first. Coliflo is Gmail-only and does not currently support Outlook.

Can an AI email assistant reply for me without opening my inbox?

Only a messaging-first tool does this. Fyxer and Jace draft replies but leave them in the inbox for you to open and send. Coliflo sends the draft to WhatsApp, where you approve or edit it and send, so the reply goes out from your Gmail address without the inbox being opened.

Pricing and compliance details verified September 2026 against each vendor's published pages. Coliflo figures are internal, measured across the Coliflo user base.

Rarely at your desk and tired of Gmail piling up? Try Coliflo free for 7 days and answer your next client email from WhatsApp.