A lightweight macOS menubar app that adds black rounded corners and menubar to your screen, matching macOS Tahoe's window aesthetic.

Apple gave Tahoe big, friendly, rounded window corners. Lovely! But they forgot about the screen edges, which stay stubbornly sharp. So now your wallpaper photobombs every corner—little slivers of beach sunset peeking out from behind your dark Terminal like "hey, remember me?"

It's... not a great look.

Tekitou paints the corners black so your wallpaper knows its place. Match the corner radius to your window style (16px, 21px, or 26px—Tahoe can't pick just one), and suddenly everything lines up like it should have from the start.

Tekitou is a complete rewrite of Gaffer, taking a fundamentally different approach:

Why overlay is better:

• No image processing = instant response
• No cache management = simpler code
• No wallpaper modification = cleaner approach
• Works with any wallpaper automatically

• Corner styles: Match different Tahoe window types
  • Square Corners (0px) - menubar only
  • Titlebar (16px) - Terminal-style windows
  • Compact Toolbar (21px) - compact toolbar windows
  • Toolbar (26px) - Finder/Safari-style windows
• Continuous curvature: Uses Apple's squircle math, not simple arcs
• Multi-display: Each screen gets its own overlay
• All Spaces: Works across all virtual desktops
• Login Item: Optional start at login

brew tap jaamesd/tap
brew install --cask tekitou

1. Download Tekitou.zip from Releases
2. Unzip and move Tekitou.app to /Applications
3. Launch from Applications folder

./build-app.sh
open Tekitou.app

• macOS 13.0 (Ventura) or later

Tekitou creates transparent, click-through overlay windows positioned just above the desktop but below your app windows. Each overlay draws:

1. A black menubar strip at the top
2. Black corner shapes using Apple's continuous curvature bezier curves

The overlays use NSWindow.Level positioning to stay above the wallpaper but below normal windows, so your apps appear naturally on top.

MIT