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Rectangle vs Mosaic: catalog facts
Rectangle	Mosaic
Freemium Rectangle is free and open source under the MIT licence. Rectangle Pro is a separate paid…	Paid From £14.99, with a free 7-day trial.
macOS	macOS
Keyboard shortcuts and drag-to-edge snap areas, both configurable Thirds and two-thirds layouts, not just halves	Drag-and-drop layout panel Custom layouts with gutters and groups
macOS 10.15 or newer Needs accessibility permissions, which people are rightly cautious about	Paid after a 7-day trial macOS only
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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