Just flip on Bluetooth and Jott magically sends your messages to nearby users with a new mesh technology called AirChat. Try it at school, concerts, on a bus, or on a plane'* and is a Social Network in the social & communications category. There are four alternatives to Jott Messenger for a variety of platforms, including Android, Online / Web-based, F-Droid, Facebook and Facebook Messenger. The best alternative is Briar, which is both free and Open Source. Other great apps like Jott Messenger are Facechat, Bridgefy and WorldChat.
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.