JUST ZEN
A calm workspace for Mac and Windows

All your apps.
One window.
No switching.

Gmail, Slack, Teams, Notion, anything on the web, side by side in one window. Type two letters and the app you want appears where you want it. Messages come to you. Claude reads what's open. Free, open source, and nothing leaves your machine.

Download for Mac Download for Windows See every feature Free · open source (ISC) · macOS 13+ on Apple silicon, signed and notarized · Windows 10+ 64-bit
Stays on your computer, nothing syncedLogins encrypted in the Keychain or DPAPINo account, no telemetryOpen source
Search, don't switch

Two letters. Enter. It's there.

Every pane has a search button in its corner. Type sl, press Enter, and Slack fills that pane. Nothing to hunt through, no dock, no tab bar, no window juggling.

Messages come to you

One bell. Every chat. The message itself.

Slack, Google Chat, Teams and WhatsApp keep running in the background, every workspace of them. The bell shows who said what. Click it and that conversation opens in the pane you're in, not somewhere else.

Claude reads what's open

Pick a pane. Ask.

Claude Code sits beside your apps. Choose any open pane, document or note from the About dropdown and ask: summarise this thread, draft a reply, turn it into tasks. It runs inside a sandbox and only sees what you point it at.

Explore the window

Every part of it, in one screenshot.

Just Zen: two panes side by side, the justzen.co page on the left with text selected and a right-click menu offering Send Selection to Claude and Send Selection to Tasks, Proton Mail sign-in on the right, a search button in the corner of each pane, and the Claude and Tasks rails on the right

Why not just browser tabs?

Because tabs are where attention goes to die.

Each app keeps its own login

Two Gmail accounts, three Slack workspaces, a client's Notion: all signed in at once, none of them seeing each other.

Side by side, not one at a time

As many panes as you need, resized by dragging. The brief next to the inbox, the doc next to the chat.

One notification stream

Every chat tool in one bell, with the message text, muted when you say so.

Nothing leaves your machine

No account, no sync, no telemetry. Logins in the Keychain. Claude in a sandbox. Open source, so you can check.

Less mental load. Less app-switching chaos.

Windows is new: the installer isn't code-signed yet (SmartScreen will ask you to confirm), and Claude is Mac-only for now because it runs inside a macOS sandbox. Everything else is the same.