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Mosaic vs Rectangle: catalog facts
Mosaic	Rectangle
Paid From £14.99, with a free 7-day trial.	Freemium Rectangle is free and open source under the MIT licence. Rectangle Pro is a separate paid…
macOS	macOS
Drag-and-drop layout panel Custom layouts with gutters and groups	Keyboard shortcuts and drag-to-edge snap areas, both configurable Thirds and two-thirds layouts, not just halves
Paid after a 7-day trial macOS only	macOS 10.15 or newer Needs accessibility permissions, which people are rightly cautious about
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is 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 21, 2026

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