Bluetooth Apps and Examples

There are a lot of great apps and examples that allow the micro:bit to talk to a smartphone over BLE

Overview

Bluetooth applications can run on a variety of devices, including but not limited to smart phones and tablets. You can also run Bluetooth enabled applications on devices such as a Raspberry Pi.

Below is a curated list of some Bluetooth applications you might like to read about and try for yourself on your micro:bit. Please contribute to this list if you know of any more. Many listed here are taken from the micro:bit Awesome list

Applications, tools and examples

Android App facilitates pairing and flashing programs to the micro:bit. The app was originally developed by Samsung and is now maintained by the Micro:bit Educational Foundation. The micro:bit android app source code can be found on GitHub.
iOS App faciliates pairing and flashing programs to the micro:bit
Swift Playgrounds contains a Playground Book available in the Swift app and a micro:bit Swift API to develop further resources
Scratch facilitates a connection to the micro:bit and uses display, buttons and motion sensor services.
Bitty Software Apps
micro:bit Blue App for Android
Kitronik Move - Android app that presents a D-Pad interface to control a micro:bit over Bluetooth LE.
microBit.js - JavaScript library to interact with BBC micro:bit using web bluetooth API.
microbit-web-bluetooth - Web Bluetooth library implementing the micro:bit Bluetooth Profile.
microbit-web-components - Web Components for all the micro:bit features exposed via BLE.
Gobot - Framework for the Go programming language to program devices in the real world. It can access the micro:bit via Bluetooth LE.
micro:bit Slither - Multi-player snake game on Android, controlled with micro:bits via Bluetooth.
Serial Bluetooth Terminal- Android app capable to send and receive micro:bit Bluetooth UART data.
Bluetooth Low Energy Remote Control for Spotify - This project allows you to configure your micro:bit to work as a Bluetooth Low Energy remote control for Spotify on macOS.
Musical Instrument Controller - A micro:bit instrument that communities with an iPad via Bluetooth into MIDI controller app that can play music via GarageBand.