Keep your laptop open to use keyboard/TouchID while turning off your internal screen completely. Sync brightness/volume via native keys, schedule blue light filter, and boost productivity with Pomodoro and Zen modes.
More than just basic brightness control. Open Clamshell packs advanced display features tailored for MacBook setups.
Blackout your MacBook's internal display completely without closing the lid. Keep using your built-in keyboard, trackpad, and speakers smoothly.
Sync external monitor's hardware (DDC) brightness automatically using native MacBook brightness keys or ambient light sensors, and finely adjust volume with a dedicated slider or custom shortcuts.
Control Night Shift warmth levels directly from the control panel without digging into System Settings. Integrates directly with macOS native APIs to protect your eyes without breaking custom ICC calibration profiles.
Stay focused with a full-screen Zen overlay and customizable Pomodoro cycles providing gentle visual feedback for work and breaks.
Bypass battery charging and run directly on AC power (80% hold) via SMC control. Schedule safe calibration runs every 4-8 weeks, or trigger one instantly ("Run Now"), to reset sensor drift and prevent swelling.
When turning display off/on, native fullscreen spaces are safely evacuated and restored. Plus, use the global hotkey HUD to effortlessly send active windows to another monitor instantly.
Prevent your mouse cursor from escaping or getting trapped behind a dimmed/blacked-out monitor boundary. Smartly traps the cursor inside active displays.
Realtime input power wattage (W) measurements and USB-C adapter transmission negotiation specs fetched directly from SMC to verify charger safety and health.
Officially notarized by Apple to pass all macOS Gatekeeper security checks without warning dialogs. Features integrated Sparkle 2 updater for single-click updates.
Click through each category tab below to preview Open Clamshell's clean controls and native UI.
Seamlessly adjust resolution scaling, hardware DDC/CI brightness, and volume sliders for both Mac display and external monitors in a compact card UI.
Essential monitor controls are always free, and advanced features can be unlocked forever with a single lifetime license.
No credit card required
One-time payment, lifetime access
Everything you need to know about the license and compatibility.
Yes, each license key allows you to activate the app on up to 3 personal Macs simultaneously. You can easily deactivate a machine to transfer the license to a new one.
Yes, Open Clamshell is built as a Universal Binary, natively supporting both Apple Silicon (M1, M2, M3 series) and Intel architectures. Tested and optimized for macOS 14+ Sonoma.
Yes. Checkout is securely handled by Lemon Squeezy, a globally trusted reseller operating in partnership with Stripe. Your credit card details are encrypted and processed safely under full compliance standards.
Absolutely not. We do not use a subscription model. When your 30-day trial expires, advanced features are paused, but core monitor controls remain active. No automatic charges will ever occur.
Download the free trial now and enjoy complete control over your screens for 30 days.
Download Trial (.dmg)