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Linphone vs Simlar: catalog facts
Linphone	Simlar
Free The app and the basic SIP service are free.	Free Free and open source under the GPL.
Windows, macOS, Linux, Android, iOS	Android, iOS
Works with any standard SIP account Desktop and mobile builds from one project	Encrypts calls with ZRTP Verifies contacts with a short code on the first call
Needs a SIP account or PBX to be useful Website is primarily in French	Both callers need to be online Call quality depends on the internet connection
Downloadable app	Downloadable app
Open 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	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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