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spacedesk vs Mirror Hall: catalog facts
spacedesk	Mirror Hall
Free Offered as free display extension software.	Free Free and open source under the GPL-3.0 or later.
Windows, macOS, Android, iOS, Web	Linux
Works over USB, Wi-Fi or LAN Viewers for Android, iOS, Windows and any HTML5 browser	Turns a spare Linux device into a second screen No extra hardware needed
Primary machine is mainly Windows Wireless performance depends on the local network	Both devices must run Linux Young project with little documentation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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