GitHub - makalin/CornerFix: CornerFix is a lightweight macOS menu bar app that restores sharp display edges by overlaying customizable “caps” on the screen corners. Safe, SIP-friendly, and easy to use, it lets you toggle, resize, and recolor caps to reclaim the squared look Apple removed in macOS 26. Multi-monitor support included.

CornerFix (macOS)

Visually square the rounded display corners in macOS 26 (Tahoe) and newer by drawing unobtrusive, click‑through overlay caps.

Note: This does not change the rounded corners of individual app windows. It only restores the straight silhouette at the edges of your display.

Why CornerFix?

Apple made corners more aggressively rounded in macOS 26, and many users find the effect distracting. There’s no system setting to disable it. CornerFix provides a safe, non-invasive way to visually bring back sharp edges without hacking system files.

Read the full story on Medium: Reclaiming the Screen: A Developer’s Fix for macOS 26’s Corners

Features

• Always‑on‑top, click‑through overlay windows per display
• Adjustable cap size (pixels)
• Auto color mode (matches dark/light appearance)
• Custom color selection for tricky wallpapers
• Multi‑monitor support, Spaces/fullscreen friendly
• Menu‑bar interface, no entitlements, SIP‑safe

Quick Start (Xcode)

1. File → New → Project… → App (macOS)

   • Interface: SwiftUI, Language: Swift

2. Save as CornerFix.

3. Add the Swift files from /Sources into your target.

4. Build & run. A menu bar item named CornerFix appears.

Requirements

• macOS 13+ (tested on macOS 14–26)
• Xcode 15+

Notes

• For patterned wallpapers, try custom color mode to match the background edges.
• Overlay uses .screenSaver window level. If another app draws above that, you may see overlap.

License

MIT Ⓒ 2025 Mehmet T. AKALIN