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Zoiper vs GOnnect: catalog facts
Zoiper	GOnnect
Freemium Free softphone, with paid versions sold on the Zoiper site.	Free Free and open source under the GPL-2.0.
Windows, macOS, Linux, Android, iOS, Browser extension	Linux
Native apps on desktop and mobile TLS, SRTP and ZRTP call encryption	Phone calls and video conferences in one client Built to integrate with the Linux desktop
Proprietary, with some features in paid editions Encryption depends on server support	Needs a VoIP telephone service to call through Linux only according to the research
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
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.