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Element Call vs Duetto: catalog facts
Element Call	Duetto
Free Free and open source under the AGPL-3.0, with a commercial licence also offered.	Free Free and open source under the GPL 3.0 or later.
Web, Self-hosted	Android, Self-hosted
End-to-end encrypted group calls Built on the open Matrix protocol	End-to-end encrypted audio and video Always-on channel with no calling step
Self-hosting requires a Matrix setup alongside it Focused on calls, with no text chat of its own	Limited to two people by design Very new project with little track record
Web application, Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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