Bluetooth Low Energy (BLE) is highlighted as a transformative technology for local-first applications, enabling real-time performance and peer-to-peer communication without internet connectivity. In a presentation at the /dev/world conference in Australia, Tom Karpiniec discussed how BLE can enhance mobile and cross-platform apps by allowing devices to communicate directly, which is particularly beneficial in environments with limited internet access, such as airplanes, warehouses, and outdoor venues. BLE operates through central and peripheral roles and can avoid single points of failure, unlike traditional Wi-Fi networks. Successful implementation of BLE involves understanding its core concepts, such as advertisement content, device tracking, and security, and requires careful attention to connection policies and cross-platform compatibility. By leveraging these strategies, developers can create robust applications that offer seamless user experiences even when offline, as demonstrated by Ditto's SDK.