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GridSnap – an open-source Divvy-style window snapper for macOS

github.com45 points24 comments
Screenshot of GridSnap – an open-source Divvy-style window snapper for macOS

GridSnap is an open-source Divvy-style window snapper for macOS that shows a configurable grid when a global shortcut is pressed, lets you drag across cells to position a window with a live preview, and supports saving regions as one-keystroke presets. It includes presets with global shortcuts (a Full screen preset on ⌃⌥F is built in), undo/redo for the last snap, configurable columns/rows and gutter gaps with wider gutters marking halves/thirds/quarters, the choice to target the focused window or the one under the cursor, multi-display support, and a menu-bar-only app that launches at login without a Dock icon, network access, analytics, or accounts.

Requirements and install options are macOS 14+ (tested on macOS 26) on Apple Silicon or Intel; build requires Xcode Command Line Tools with the macOS 26 SDK. Install via Homebrew cask or download a release zip; the app requires Accessibility permission to move other apps’ windows. Settings let you change shortcuts (default show grid ⌃⌥D, undo ⌃⌥Z), grid size, gap, target rules and manage presets. Development uses a simple build.sh, Swift source files under Sources/, and notes that macOS ties Accessibility to code signatures - creating a self-signed "GridSnap Dev" certificate avoids re-granting after rebuilds. Known limits: full-screen windows are ignored and some apps enforce minimum sizes. Licensed MIT.

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