Introducing CornerForm, a new take on adding rounded corners to Mac displays

Introducing CornerForm, a new take on adding rounded corners to Mac displays

Nov 13, 2026

Nov 13, 2026

Today, Sun Apps is introducing CornerForm, a simple but powerful utility app that adds highly customizable rounded corners to your Mac display. While this is not a new idea, CornerForm introduces multiple new features and offers the most complete and customizable experience available.

“CornerForm was inspired by the latest MacBook displays, particularly the new PROLED XDR Display with Dynamic Island. I wanted a way to have full-screen apps have rounded corners at the top to match the new bottom corners, but without rounding anything on the desktop. No app offered this, so I created CornerForm.” – Dylan McDonald, owner of Sun Apps.

CornerForm offers full customization of the rounded corners:

  • Choose any value for the curve radius

  • Enable or disable specific corners

  • Place the corners over or below the Menu Bar

  • Continuous or circular corner formulas

A key feature of CornerForm is separate configurations for desktop and full-screen apps. When using an app in full screen on MacBook Pro or MacBook Air, the area around the notch or Dynamic Island is blacked out, unlike on the Desktop. So, CornerForm lets you create separate configurations for desktop and full screen. For example, you can choose to decrease the corner radius and put the corners below the Menu Bar only in full screen. Or, you can disable the corners in full screen altogether.

You can also create separate custom configurations for every display. On a MacBook, CornerForm supports setting default configurations for the built-in display and external displays. And on any Mac, you can add specific monitors and displays that will retain their own individual configuration between connections. This is great for having a larger corner radius on the built-in display of a MacBook, but only a slight radius on external displays.

CornerForm also includes a Menu Bar extra for quick access, including an option to immediately disable all active rounded corners. The software rounded corners also do not appear when taking screenshots.

To make setup easy, CornerForm has built-in presets for MacBook Displays and app window radii. You can choose your MacBook display type for quickly creating harmonious corners, or you can match the radius to what app windows use, depending on your macOS version.


CornerForm is available now on the Mac App Store and is completely free with no In-App Purchases, subscriptions, or ads. You can learn more or download it now at our website.

Sun Apps, LLC

Copyright © 2026 Dylan McDonald