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