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Tandem App for Mac and Windows.

Your workspaces in their own window, with desktop notifications, an unread count on the Dock or taskbar, and an icon in the menu bar or tray. Version 1.0.0.

Mac

macOS 11 Big Sur or newer.

Download for Apple silicon (M1 and later) Download for Intel Macs

Not sure? Apple menu → About This Mac: "Chip: Apple M…" means Apple silicon.

Windows

Windows 10 or 11. Installs for you only; no administrator needed.

Download for Windows Download for Windows on ARM

Updates install themselves.

!Opening it the first time

This early version isn't yet signed by Apple or Microsoft, so your computer asks you to confirm before opening it the first time. That happens once.

Mac: open the downloaded file and drag Tandem App to Applications. The first time, right-click (or Control-click) Tandem App in Applications and choose Open, then Open again. If macOS still refuses, go to System Settings → Privacy & Security and click Open Anyway.
Windows: if you see "Windows protected your PC", click More info, then Run anyway.

?Prefer not to install anything?

Tandem App works in any modern browser. In Chrome or Edge you can also install it from the address bar (the install icon on the right) for its own window without downloading this app.