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Sipdroid vs Zoiper: catalog facts
Sipdroid	Zoiper
Free Free and open source under GPL-3.0-only.	Freemium Free softphone, with paid versions sold on the Zoiper site.
Android	Windows, macOS, Linux, Android, iOS, Browser extension
Connects to SIP services for VoIP calls Supports video calling	Native apps on desktop and mobile TLS, SRTP and ZRTP call encryption
Requires a SIP service.	Proprietary, with some features in paid editions Encryption depends on server support
Downloadable app	Downloadable app, Browser extension
Open source	Closed source
License: GPL-3.0-only	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
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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