Phil is a tiny macOS menu-bar app that keeps your app windows filled to the screen, and leaves the ones you've deliberately snapped alone.
Download Phil v1.0.3New windows fill the screen on launch, and stay filled as you work, pixel-perfect.
Snap a window to half, a quarter, or a third and Phil leaves it, however you snapped it.
Lives in the menu bar, sips no CPU, runs at login. Pause or exclude any app anytime.
Each window fills the screen it's actually on. Drift a maximized window and it snaps back.
Maximize by default, except what you've clearly arranged. When you drag, keyboard-snap, or use the green-button menu to put a window at a tiling zone, Phil recognizes the geometry and stays hands-off. Bring it back toward full and Phil takes over again. Grant Accessibility once on first launch. That's all it needs.