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Calls vs Smart-SIP-Phone: catalog facts
Calls	Smart-SIP-Phone
Free Free and open source under the GPL-3.0-or-later.	Freemium Free standard version, with a paid Pro version and branding options for businesses.
Linux	Windows, macOS, Linux, Android, iOS
Handles both cellular and SIP calls Integrates with the GNOME desktop	Works with any SIP PBX Native packages for many Linux distributions plus Windows and macOS
Linux only SIP calling needs an account with a VoIP provider	Proprietary software Needs a SIP account or PBX to be useful
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License: Proprietary
Not stated if an account is 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.