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The Adafruit Feather nRF52 Bluefruit is another easy-to-use all-in-one Bluetooth Low Energy board, with a native-Bluetooth chip, the nRF52832. It's an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging. It allows you to run code directly on the nRF52832, straight from the Arduino IDE as you would with any other MCU or Arduino compatible device. Adafruit pre-programed the chip with an auto-resetting bootloader so you can upload quickly in the Arduino IDE with no button-pressing.
You can use the free iOS App or Android App from Adafruit, or write your own to communicate with the UART service.
More information ia available on the website of Adafruit.