Compare software

Smart-SIP-PhoneZoiper
Freemium

Free standard version, with a paid Pro version and branding options for businesses.

 Freemium

Free softphone, with paid versions sold on the Zoiper site.

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux, Android, iOS, Browser extension
  • Works with any SIP PBX
  • Native packages for many Linux distributions plus Windows and macOS
  • Native apps on desktop and mobile
  • TLS, SRTP and ZRTP call encryption
  • Proprietary software
  • Needs a SIP account or PBX to be useful
  • Proprietary, with some features in paid editions
  • Encryption depends on server support
Downloadable app Downloadable app, Browser extension
Closed source Closed source
License: Proprietary License not stated
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

Checked October 1, 2026

Checked September 24, 2026

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