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Zoiper vs Smart-SIP-Phone: catalog facts
Zoiper	Smart-SIP-Phone
Freemium Free softphone, with paid versions sold on the Zoiper site.	Freemium Free standard version, with a paid Pro version and branding options for businesses.
Windows, macOS, Linux, Android, iOS, Browser extension	Windows, macOS, Linux, Android, iOS
Native apps on desktop and mobile TLS, SRTP and ZRTP call encryption	Works with any SIP PBX Native packages for many Linux distributions plus Windows and macOS
Proprietary, with some features in paid editions Encryption depends on server support	Proprietary software Needs a SIP account or PBX to be useful
Downloadable app, Browser extension	Downloadable app
Closed source	Closed source
License not stated	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 September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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