fullscreen
Fullscreen that doesn't eat 34"
Video, Zoom, or a game fullscreens into its zone only. The rest of the panel keeps working.
With Rectangle or Stage Manager: fullscreen always takes the whole panel.
34–49″ ultrawide · macOS utility
Your 34″ ultrawide. Two real displays.
ScreenBoundary splits your ultrawide into real macOS displays — each with its own menu bar, Spaces, and fullscreen. Fullscreen a video in one zone. Work in the other. No adapters, no window managers.
01
One wide panel. Too big to use like two monitors.
Display 1 · 1920×1080
Display 2 · 1920×1080
Fullscreen in one zonethe other keeps working
Own Spaces per zoneswipe independently
No extra hardwareno adapter, no dock
~30 sec setupdrag zones · click Enable
01 — Why it's different
What window managers can't do
Three things that only work with real displays.
Rectangle, Magnet, and Stage Manager arrange windows. ScreenBoundary creates displays. That's why these three things are impossible with a window manager — and native with ScreenBoundary.
Independent Spaces per zone
Swipe between Spaces in one zone. The other zone doesn't move. Each zone has its own Mission Control.
With a window manager: swiping Spaces moves everything — the entire panel scrolls.
macOS sees real monitors
Apps remember "their" display. Share just one zone in Zoom — not the whole panel. System Settings shows both displays independently.
With a window manager: apps see one display. Zoom shares the whole panel.
01 — Setup
How it works
Three steps. Then your Mac just treats it as two displays.
1920 × 1080
Zones
Zone 1
Zone 2
+ Add zone
STEP 01
Calibrate
Open ScreenBoundary and drag two rectangles across your ultrawide — one for each zone you want. Takes about 30 seconds.
1
2
+1 appeared
Ultrawide (Zone 1)1920 × 1080
Ultrawide (Zone 2)1920 × 1080
Enable ScreenBoundary
STEP 02
Enable
Hit Enable ScreenBoundary. Your virtual displays appear in System Settings instantly. No restart, no extra hardware.
STEP 03
Use normally
Drag windows between zones, go fullscreen, switch Spaces. Each zone is a real macOS display. Your apps can't tell the difference.
02 — Compare
ScreenBoundary vs window managers
Arrangement vs. creation.
Rectangle, Magnet, and Stage Manager move windows around one display. ScreenBoundary makes macOS see two displays. That difference is why fullscreen, Spaces, and screen sharing work the way you'd want.
| ScreenBoundary | Rectangle / Magnet | Stage Manager | |
|---|---|---|---|
| Fullscreen stays in its zone | |||
| Independent Spaces per zone | |||
| Apps remember "their" display | |||
| Share one zone in Zoom / Meet | |||
| One-time · from $12.99 | free | free |
Window managers are great for what they do — arrange windows. ScreenBoundary is for when you want macOS itself to see two separate monitors.
05 — Pricing
Launch price
One-time. Yours forever.
Price goes back up after launch — no subscription, ever.
Instant delivery by email: download + license key.
Both include
- Unlimited zones & virtual displays
- Its own menu bar, Spaces & fullscreen per zone
- Up to 60fps capture, hardware-accelerated on Apple Silicon
- Silent over-the-air updates (Sparkle)
- No account, no iCloud, no data collected
30-day money-back guarantee
Doesn't work on your setup? Email us and you'll get a full refund.
04 — Questions
Questions
Everything you'd ask before buying.
Can I use it on a working screen to split an ultrawide?
Yes. Draw zones across an ultrawide and each becomes its own display in macOS, with separate Spaces, menu bar, and fullscreen. Mirroring tools can't do that.
Does it work on Apple Silicon and Intel?
Yes. macOS 13 Ventura and up, Intel and Apple Silicon. On Apple Silicon the capture is hardware-accelerated, up to 60fps. You won't notice it running.
Can I share just one zone in a Zoom or Meet call?
Yes. Because ScreenBoundary creates real macOS displays, Zoom and Meet let you pick a specific display to share. Pick the zone you want; the rest of your screen stays private.
What if something looks wrong when I enable it?
Every activation shows an auto-revert countdown — the same pattern macOS uses when you change resolution. If anything looks wrong, do nothing and it reverts in 15 seconds. Click Revert to undo immediately. You cannot get your Mac stuck.
Can I use it on multiple Macs?
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.
Does it work offline?
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.
Is it on the App Store?
No. ScreenBoundary uses a private macOS API to create virtual displays, that Apple doesn't allow on the App Store. It ships as a notarized app with a registered Developer ID. macOS accepts it on first launch, no warnings.
What if it doesn't work on my specific setup?
Email us within 30 days. We'll refund you, no questions asked.