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Zoiper vs MicroSIP: catalog facts
Zoiper	MicroSIP
Freemium Free softphone, with paid versions sold on the Zoiper site.	Free Free and open source under the GPL v2.
Windows, macOS, Linux, Android, iOS, Browser extension	Windows
Native apps on desktop and mobile TLS, SRTP and ZRTP call encryption	Small and light on system resources Works with standard SIP providers and PBX systems
Proprietary, with some features in paid editions Encryption depends on server support	Windows only; other desktops need Wine No mobile apps
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
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 September 23, 2026

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