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SizeUp vs Loop: catalog facts
SizeUp	Loop
Paid $12.99 licence with an unlimited free trial.	Free Free and open source, with optional donations.
macOS	macOS
Half and quarter screen actions from the keyboard Moves windows between multiple displays	Radial menu for picking window positions quickly Keyboard shortcuts as well as mouse-driven selection
Stated compatibility ends at macOS 14 Sonoma Mac only	Requires macOS 13 or later macOS only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.