Open Source · macOS

Email, handled
before you get there

Exo is an AI-native desktop email client. Every email gets analyzed, prioritized, and drafted before you open it. Zero cognitive load — just review and send.

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Exo inbox with AI-powered priority triage
Features

AI that actually understands your email

Not a chatbot bolted onto your inbox. Exo treats AI as infrastructure — it runs in the background, learning how you work, so everything is ready when you need it.

Automatic Triage

Claude analyzes every incoming email and assigns priority — high, medium, low, or skip. Your inbox is pre-sorted by what actually matters.

Smart Drafts

AI-generated reply drafts that consider thread context, sender background, and your writing style. Ready before you open the thread.

Agent System

Cmd+J to ask Claude anything about the current email. Draft a reply, look something up, forward with context. Bring your own agents too.

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Sender Lookup

Automatic web search surfaces sender context — role, company, LinkedIn — in a sidebar panel so you never reply blind.

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Memory System

Learns from your priority overrides, draft edits, and explicit instructions. Memories persist across sessions and app updates.

Keyboard-Driven

j/k navigation, Gmail keybindings, Cmd+K command palette, batch selection with Shift+click. Built for people who live in their inbox.

AI-powered email in action

Watch how Exo triages your inbox, generates drafts, and lets you refine them with natural language feedback.

The agent system

Press Cmd+J to open the agent palette. Ask it to draft replies, search your email, forward with context, or delegate to external agents.

A complete email client

Exo isn't just AI features — it's a full-featured email client built for daily use.

Composition

  • Rich text editor with ProseMirror
  • @mention autocomplete for CC
  • Multiple signatures
  • Scheduled send & undo send
  • Inline images & attachments
  • Forward with thread preservation

Organization

  • Split inbox — Priority, Other, custom tabs
  • Snooze with natural language
  • Archive-ready detection & batch archive
  • Hybrid local + Gmail search
  • Calendar sidebar with multi-account
  • Multi-account with instant switching

Performance

  • Incremental background sync
  • Offline support with queued actions
  • Optimistic UI with undo for everything
  • LRU HTML cache for instant navigation
  • Image prefetching

Extensions

  • Bundled, private, and runtime-installable
  • Custom agent providers via Cmd+J
  • Sidebar panels scoped to emails
  • MCP server support for agent tools
  • Extension authentication & onboarding

Try Exo today

Open source, free, macOS. All you need is a Gmail account and an Anthropic API key.

Download for Mac View Source