Ring (SFLphone) is an open-source SIP-compatible softphone and instant messenger for Linux, Microsoft Windows, OS X and Android. Developed by Savoir-faire Linux
License: Open Source
FaceTime is a dedicated video calling app with strong privacy features and integration within the Apple ecosystem, ideal for personal communication. In contrast, Ring serves as a smart home security device with video calling capabilities, making it more suitable for home monitoring and security rather than casual communication.