Bluetooth Chat will help you to send short messages and images using Bluetooth technology. You can chat with your friends if you are in the Bluetooth range and don't have access to the Internet.
It will be helpful for students if there is no Wi-Fi in your school, for travelers to chat between tents in mountains, and in many others cases.
Your friends don't have an Internet connection to install this app? You can easily share an .apk file of the app via Bluetooth!
Bluetooth Chat is fully open-source: https://github.com/glodanif/BluetoothChat
You can help to localize Bluetooth Chat to your language: https://crowdin.com/project/bluetoothchat