Fullscreen that doesn't eat 34 inches
Fullscreen a video, a Zoom call, or a game into one half. The other half keeps working.
With a window manager, fullscreen always swallows the whole panel.
ScreenBoundary turns one ultrawide into two or three genuine macOS displays — each with its own menu bar, Spaces, and native fullscreen. Not window tiling. Real displays macOS recognizes in System Settings.
Rectangle, Magnet and Stage Manager arrange windows inside one screen. ScreenBoundary tells macOS your ultrawide is actually two monitors — so the system itself treats each half as the real thing.
Fullscreen a video, a Zoom call, or a game into one half. The other half keeps working.
With a window manager, fullscreen always swallows the whole panel.
Swipe between Spaces on the left while the right stays put. Two independent Mission Controls on one piece of glass.
With a window manager: swiping Spaces moves everything — the entire panel scrolls.
Each zone gets its own menu bar. Apps remember which display they live on. On a Zoom/Meet call you share just one zone — not your entire ultrawide.
With a window manager: apps see one display. Zoom shares the whole panel.
Drag rectangles over your ultrawide. Two halves, three columns, whatever fits your work. ~30 seconds, no resolution math.
ScreenBoundary spins up a real virtual display for each zone and lays them edge to edge. macOS asks to extend once, then remembers.
Menu bar, Dock, Spaces and fullscreen per zone. A built-in countdown reverts everything if anything looks off.
BetterDisplay is a powerful, general-purpose display tool. Window managers arrange windows inside one screen. ScreenBoundary does one thing: turn your ultrawide into real, independent macOS displays in about 30 seconds.
| ScreenBoundary | BetterDisplay | Window managers | |
|---|---|---|---|
| Visual zone calibration (~30 sec) | Pro, manual | ||
| Auto-revert failsafe built in | |||
| Multiple zones from one panel | Pro, manual | n/a | |
| Zones are real displays (own menu bar & Spaces) | Pro, manual | ||
| Purpose-built for splitting a panel | general-purpose | ||
| One-time purchase from $12.99 | free / Pro paid | varies |
Not on the Mac App Store — uses a private macOS display API. Signed with Developer ID and notarized, so Gatekeeper opens it without warnings.
A second 27″ monitor costs $300+ and eats your desk. You already own the pixels in your ultrawide — ScreenBoundary unlocks them as real displays for $12.99.
Get ScreenBoundary — From $12.99No. Window managers arrange windows inside one display. ScreenBoundary creates additional real displays that macOS recognizes in System Settings.
Yes — native fullscreen targets that zone's display, not the whole panel.
Both. macOS 13 Ventura and later. On Apple Silicon the per-zone capture is hardware-accelerated, up to 60fps.
Personal covers 1 Mac, Home covers up to 3. If you move to a new Mac, use Deactivate this Mac in Settings — it frees the seat instantly so you can activate on the new machine. No support email, no forms.
Yes. The app activates online once, then works offline for up to 14 days between silent license revalidations. The check happens in the background — you won't notice it.
Each zone is captured and composited at up to 60fps. On Apple Silicon it's hardware-accelerated and negligible; on Intel it's light enough for all-day use.
It uses a private macOS display API the App Store doesn't allow. It's signed with a registered Developer ID and notarized, so it opens cleanly on first launch.
You share a single zone's display in Zoom or Meet — usually exactly what you want. The rest of your screen stays private.
No account, no analytics. The only network call is license activation/validation with Lemon Squeezy.
Price goes back up after launch — no subscription, ever.
Instant delivery by email: download + license key.
Doesn't work on your setup? Email us and you'll get a full refund.