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Meshenger vs Duetto: catalog facts
Meshenger	Duetto
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL 3.0 or later.
Android	Android, Self-hosted
No accounts, servers or internet connection needed Voice and video calls directly between devices	End-to-end encrypted audio and video Always-on channel with no calling step
Android only Only reaches devices on the same network	Limited to two people by design Very new project with little track record
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.