A lightweight, high-performance macOS utility focused on fast window management and keyboard-driven workflows.
MCSC is a small background app built as a learning project to explore low-level macOS APIs, event systems, accessibility automation, and performance-focused desktop tooling.
It is heavily inspired by the original Mission Control Plus app.
“Wouldn’t be possible without the original Mission Control Plus.”
Most macOS utilities in this category are either:
- Electron-heavy
- Resource intensive
- Over-engineered
- Closed ecosystems
MCSC was built with a different goal:
- native macOS APIs
- minimal memory usage
- near-zero idle CPU usage
- instant keyboard response
- small and understandable codebase
This project intentionally avoids unnecessary abstraction layers where possible and uses direct AppKit/Core Foundation integration instead of large UI frameworks.
System-wide shortcuts powered by low-level CGEventTap.
Supported actions:
| Shortcut | Action |
|---|---|
Cmd + W |
Close active window |
Cmd + Q |
Quit active application |
Cmd + M |
Minimize active window |
Cmd + H |
Hide active application |
Cmd + Space |
Trigger Mission Control UI fix |
Uses AXUIElement directly to:
- inspect windows
- manipulate application state
- interact with windows from other apps
- manage focus and visibility
Includes dedicated handling for:
- Mission Control
- Exposé
- stuck UI states
- failed transitions
MCSC can automatically attempt recovery sequences when macOS gets stuck during Mission Control interactions.
Integrated using SMAppService.
The app can automatically start with macOS and remain quietly available in the background.
MCSC is designed to stay lightweight at all times.
Typical runtime characteristics:
- ~0% idle CPU usage
- ~14MB memory usage
- negligible battery impact
- event-driven architecture
- no unnecessary polling loops
MCSC uses a service-oriented architecture inspired by MVVM principles.
-
EventTapService- global keyboard interception
- low-level event processing
-
AccessibilityService- window inspection and manipulation
- AX API communication
-
MissionControlService- Mission Control state monitoring
- recovery handling
-
LaunchAtLoginService- startup integration using
SMAppService
- startup integration using
- Swift
- AppKit
- Core Foundation
- Accessibility APIs
- CGEventTap
- SMAppService
The project also experiments with:
- explicit Core Foundation memory management
Unmanaged<T>- manual teardown strategies
- low-level macOS event handling
git clone https://github.com/yourusername/MCSC.git
cd MCSCopen MCSC.xcodeprojBuild using the MCSC scheme inside Xcode.
When launching for the first time, macOS will ask for:
Required for:
- controlling windows
- listening to global shortcuts
- interacting with other applications
Grant access from:
System Settings
→ Privacy & Security
→ Accessibility
If you use Sentinel for signing:
sentinel sign --app MCSC.app --identity "Developer ID Application: Your Name (TeamID)"Verify signature:
codesign -dv --verbose=4 MCSC.appObserved during runtime testing on macOS:
| Metric | Typical Usage |
|---|---|
| CPU | ~0% idle |
| Memory | ~14MB RSS |
| Battery Impact | Negligible |
The app is intentionally event-driven to avoid unnecessary background activity.
This project exists primarily as an educational exercise.
It was built to better understand:
- macOS internals
- accessibility APIs
- event taps
- Mission Control behavior
- low-level Swift patterns
- background utilities
Codex / AI agentic coding tools were used during development.
This project is not presented as fully handcrafted from scratch.
“It is an educational project for me.
Except bugs — if you want something better, pay for the original app.”
Support the original developers if you want a polished production-grade experience.
Inspired by:
- Mission Control Plus
Massive respect to the original creators whose work inspired this project.
MIT License