Inbox, reimagined.
A calmer, faster, more modern way to work with email. Skybox unifies every mailbox, calendar, contact and account into one workspace — even when your inbox isn't.
One client for every inbox you already own — nothing to migrate, nothing to forward.
Accounts grouped into profiles, not stacked into a pile.
Work, Personal, Side project — each profile is its own workspace with its own accounts, sidebar and unified inbox. Most clients stack mailboxes on top of each other; Skybox keeps the contexts apart and the messages together.
Switch contexts, not apps.
One keystroke swaps the whole workspace — sidebar, accounts and settings — without signing anything in or out.
Every inbox in one stream.
Search across accounts, triage in batches, move messages without thinking about which server they came from.
Calendar and contacts,
right beside the mail.
Skybox syncs calendars and address books over CalDAV and CardDAV — Google, Microsoft, Fastmail, or any server you point it at. Month, week and day views, recurring events, and contacts that autocomplete in the composer across every account in the profile.
When an invitation lands in your inbox, answer it there: Accept, Maybe or Decline sends the RSVP and files the event into the calendar you pick — cancellations, updates and proposed new times included.
Built for the way email actually works.
One identity across every device, keyboard-first triage, and a platform layer that stays open for what comes next.
One identity, every device.
Accounts, profiles, layouts and settings sync wherever you sign in. Open Skybox in a new window and find the workspace exactly the way you left it.
Keyboard at the speed of thought.
Every action has a shortcut, and a command bar catches everything else. Triage a hundred messages without lifting your hands off the home row.
Designed to be extended.
A platform layer for plugins, automations and integrations — so the email workflow you've always wanted can actually be built.
An MCP server, in every inbox.
Skybox exposes your connected accounts through MCP. Claude — or any agent you trust — can search, read, draft and act across all of them, with scopes you set.
- UnifiedOne search across every profile and account.
- ScopedPer-tool auth — agents see what you allow.
- LocalTokens never leave your machine.
Sent Michael the receipt.
Done — Michael has the receipt.
Be first in line.
Skybox is in private beta. Leave your email and you'll get one message when your invite is ready — nothing else.