fullscreen
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.
34–49″ ultrawide · macOS utility
Your 34″ ultrawide. Two real displays.
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.
01
One wide panel. Too big to use like two monitors.
Display 1 · 1920×1080
Display 2 · 1920×1080
Fullscreen without losing the restone half only
Own Spaces per zoneswipe independently
No extra hardwareno adapter, no dock
~30-second setupdrag zones · click Enable
01 — The difference
Arrangement vs. creation
Window managers move windows. ScreenBoundary makes displays.
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.
A Space of its own on each side
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.
macOS treats them as real monitors
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.
02 — 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
Draw your zones
Drag rectangles over your ultrawide. Two halves, three columns, whatever fits your work. ~30 seconds, no resolution math.
1
2
+1 appeared
Ultrawide (Zone 1)1920 × 1080
Ultrawide (Zone 2)1920 × 1080
Enable ScreenBoundary
STEP 02
Enable
ScreenBoundary spins up a real virtual display for each zone and lays them edge to edge. macOS asks to extend once, then remembers.
STEP 03
Work like it's two monitors
Menu bar, Dock, Spaces and fullscreen per zone. A built-in countdown reverts everything if anything looks off.
03 — Compare
How it compares
Built to split a panel — not to tile windows.
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.
The math
$12.99 once. A second monitor is $300+.
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 $12.99A second monitor
$300+
Extra desk space · more cables · another power brick
or
ScreenBoundary
$12.99
Pixels you already own · 30-sec setup · 30-day refund
04 — Questions
Questions
Everything you'd ask before buying.
Is this a window manager?
No. Window managers arrange windows inside one display. ScreenBoundary creates additional real displays that macOS recognizes in System Settings.
Will fullscreen really stay in one zone?
Yes — native fullscreen targets that zone's display, not the whole panel.
Does it work on Apple Silicon and Intel?
Both. macOS 13 Ventura and later. On Apple Silicon the per-zone capture is hardware-accelerated, up to 60fps.
How many Macs per license?
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.
Any performance hit?
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.
Why isn't it on the App Store?
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.
Screen sharing?
You share a single zone's display in Zoom or Meet — usually exactly what you want. The rest of your screen stays private.
Privacy?
No account, no analytics. The only network call is license activation/validation with Lemon Squeezy.
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.