IntervalRadio

Peak music for peak watts.

IntervalRadio is a free web app that plays the right music for your indoor cycling workout. It analyzes each song — energy, BPM, and where the drops are — and aligns the music with your training plan: calm tracks through the recoveries, high energy in the intervals, and the drops of your favorite songs landing exactly when the hardest efforts begin.

Load any Zwift workout, .zwo or .fit file (Garmin, TrainerRoad, TrainingPeaks exports), or pick from the built-in workout library. Stream royalty-free music or use your own MP3s — analysis runs in your browser and your files never leave your device. With a smart trainer, ERG mode holds the target power for every interval while the music follows.

Nothing to install, nothing to pay — it runs in your browser.

Curious how the drop lands exactly on the interval? Read how the alignment algorithm works, or see the frequently asked questions.