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.

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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

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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

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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.

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Requirements

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

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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.

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License

MIT Ⓒ 2025 Mehmet T. AKALIN