Music Speed Changer
Change speed and pitch of audio files in real time, loop sections, detect BPM/key, and apply effects.
Music Speed Changer is an iPhone and iPad app that lets you change the speed of audio files in real time without affecting pitch (time stretch), change pitch without changing speed (pitch shift), or adjust both together with one control. The player includes looping (A/B repeat), beat-synced loop/marker snapping, key and BPM detection, bookmarking markers, and a waveform editor for practice. The integrated audio editor and player support playlists, a playing queue, preamp, balance, an 8-band graphic equalizer, reverb and delay effects, reverse playback, and export of modifications to a new M4A file (lossless or AAC). The app supports songs from your purchased library and importing audio files from device storage or cloud drives. Pro features include automatic formant shift for natural voice tone correction, independent formant controls, on-device AI stem isolation (vocals, drums, bass, piano, guitar — guitar stem noted as a Pro feature), and state-of-the-art A4 tuning, key, and BPM detection.