Music Speed Changer is a mobile application that allows users to adjust the speed and pitch of audio files on their device in real-time. The app offers three main features: time-stretching, pitch-shifting, and rate adjustment. Users can slow down or speed up audio files from 15% to 500% of the original speed, change the pitch up or down 24 semi-tones, or adjust both speed and pitch together with a single control. The app also includes a music looper, allowing users to loop sections of the music for easy practice.

In addition to its core features, Music Speed Changer offers a range of other tools and effects. Users can apply audio effects such as echo, flanger, and reverb, or reduce the vocal levels in the music for a karaoke effect. The app also includes an 8-band graphic equalizer, preamp, and balance control. Users can analyze the audio to display the BPM and musical key of each track, and bookmark positions in their audio with markers.

Music Speed Changer is a versatile app that can be used for a variety of purposes. Musicians can use it to slow down the tempo or practice in a different tuning, while audiobook listeners can speed up their listening experience. The app is also great for making Nightcore or Fast Music creations, and users can export their adjustments to a new audio file or save an altered version of the whole track or only the captured loop section.

Overall, Music Speed Changer is a powerful and easy-to-use app that offers a range of features for adjusting the speed and pitch of audio files. Its modern material design UI and simple-to-use interface make it a great choice for anyone looking to manipulate their audio files on the go.