Synchronize macOS Spaces across monitors.
Switch Spaces on one display and the others follow — the way Spaces should have worked all along, restored as a small Mac utility you install and forget.
Both monitors switch together. No tiling, no SIP off, no shell scripts.
Free public beta now · $9.99 at 1.0 launch (perpetual license, 3 Macs)
What it does
- Real Spaces, synchronized. SpacesSync works with native macOS Spaces. It doesn't replace them, doesn't tile, doesn't require SIP off.
- Configurable sync groups. Pair the displays you want synchronized; leave the others independent.
- Install and forget. Set it up once, run in the menu bar. No daily interaction, no shortcuts to learn.
- Updates via Sparkle. macOS-major-version compatibility is real ongoing work; updates ship through the standard Sparkle auto-update mechanism.
- No telemetry, no accounts. No data collection. No newsletter signup. Email is only collected at purchase, for license delivery.
Who it's for
Mac users running two or more monitors who have noticed Spaces is broken and want it fixed:
- Indie and dev power users already paying $9–$30 for Mac utilities (Bartender, Rectangle Pro, Moom, BetterTouchTool).
- Designers and creative pros running tool-palette + canvas configurations across displays.
- Engineers and ops running per-display task contexts — debugger on one screen, runtime on another.
- Anyone who remembers when switching Space on one monitor switched all of them, and wants that back.
If you've tried yabai or AeroSpace and bounced off the SIP-disable requirement, or you don't want to replace Spaces with a tiling window manager — this is the smaller, narrower fix.
Status & availability
SpacesSync is in free public beta as of June 2026. The 1.0 release is paid: $9.99 USD, perpetual license, three Mac activations per license, 14-day full-featured trial with no card and no email required.
Beta builds are direct-download by request. The beta will reach end-of-life roughly six weeks after 1.0 ships, so beta users have a clean window to convert.
Distribution at 1.0:
- Direct purchase via Lemon Squeezy — perpetual license, 3-Mac activation, 14-day refund window.
- Setapp — subscription customers will be able to install SpacesSync as part of their Setapp bundle (pending Setapp approval).
- Not on the Mac App Store. The work SpacesSync does requires private WindowServer APIs that the App Store review won't pass.
Why this exists
Multi-monitor Spaces on the Mac broke about thirteen years ago when Apple split Spaces per-display. Since then, every Space switch reminds you that what used to be one workspace is now several. Apple has not shipped a fix; the public threads asking for one are still open.
The alternatives — yabai, AeroSpace, dotfiles workarounds — require disabling System Integrity Protection or replacing native Spaces with a tiling window manager. SpacesSync is the small, focused, paid utility that fixes the regression without changing how you work.