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Mirror Hall vs OpenDisplay: catalog facts
Mirror Hall	OpenDisplay
Free Free and open source under the GPL-3.0 or later.	Free Free and open source under GPL-3.0, with optional donations.
Linux	macOS, iOS
Turns a spare Linux device into a second screen No extra hardware needed	True extended display, not just mirroring Works over USB or Wi-Fi with touch and scroll input
Both devices must run Linux Young project with little documentation	Only extends Macs; Windows and Linux hosts are not supported Maintained by a single developer
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account needed	No account 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.