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