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Fossify Phone vs Calls: catalog facts
Fossify Phone	Calls
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0-or-later.
Android	Linux
No ads or tracking libraries Number blocking and multi-SIM support	Handles both cellular and SIP calls Integrates with the GNOME desktop
Android only A dialer only; contacts and messages are separate Fossify apps	Linux only SIP calling needs an account with a VoIP provider
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
No 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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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