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Simlar vs Linphone: catalog facts
Simlar	Linphone
Free Free and open source under the GPL.	Free The app and the basic SIP service are free.
Android, iOS	Windows, macOS, Linux, Android, iOS
Encrypts calls with ZRTP Verifies contacts with a short code on the first call	Works with any standard SIP account Desktop and mobile builds from one project
Both callers need to be online Call quality depends on the internet connection	Needs a SIP account or PBX to be useful Website is primarily in French
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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