ChatAround - Offline Chat is described as 'ChatAround allows users to chat offline - no internet connection needed. It uses Bluetooth / WiFi to create a local connection. There is no account registration needed' and is an app in the Social & Communications category. There are three alternatives to ChatAround - Offline Chat for Android, iPhone, Linux and Windows. The best alternative is Briar, which is both free and Open Source. Other great apps like ChatAround - Offline Chat are Bridgefy (Free) and Cwtch (Free, Open Source).
An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required.
Cwtch (/k?t?/ - a Welsh word roughly translating to “a hug that creates a safe place”) is a decentralized, privacy-preserving, multi-party messaging protocol that can be used to build metadata resistant applications.