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