Compare software

Duet Display vs Android Virtual Pen: catalog facts
Duet Display	Android Virtual Pen
Paid Paid app with plans listed on the pricing page.	Free Free and open source under the GPL 3.0.
Windows, macOS, Android, iOS	Linux, Android
Uses tablets and phones as extra monitors Drawing tablet mode for illustration	Built for low-latency pen input Adjustable pressure threshold and sensitivity
Paid, with features split across plans Requires an account	Host side supports Linux only Needs a pen-capable Android device
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-only
Account needed	Not stated if an account is needed
Not stated if it 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.