Rectangle is described as «Move and resize windows on macOS with keyboard shortcuts. Rectangle is a window management app based on Spectacle, written in Apple Swift» and is a Window Manager in the os & utilities category. There are more than 50 alternatives to Rectangle for Mac, Windows, PortableApps.com and MacPaw Setapp. The best alternative is Microsoft PowerToys, which is both free and Open Source. Other great apps like Rectangle are DisplayFusion, AquaSnap, WindowGrid and BetterTouchTool.Rectangle alternatives are mainly Window Managers but may also be File Search Utilities. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Rectangle.