Free tools / iPhone

BPM Detector by Spectralite

Hold your iPhone up to the speakers and it sends the tempo and beat over OSC and MIDI clock.

Get it for Mac instead

BPM Detector locked on 128 BPM, listening through the iPhone microphone

What it sends

OSC. Drive Resolume, TouchDesigner and lighting desks.
MIDI clock. Keep drum machines and hardware in time with the room.
Ableton Link. Put other Link apps on the same tempo and beat. Coming soon

On the Lock Screen. BPM Detector keeps listening in the background. The tempo, lock state, confidence and input stay on the Lock Screen, and you can read them without opening the app.

An iPhone Lock Screen showing the BPM Detector Live Activity: locked on 128 BPM from the iPhone microphone, with the confidence meter full — On the Lock Screen. BPM Detector keeps listening in the background. The tempo, lock state, confidence and input stay on the Lock Screen, and you can read them without opening the app.

BPM Detector in the compact Dynamic Island, showing 128.1 BPM — In the Dynamic Island. The compact island shows the tempo beside the app's icon. Expanded, it adds the lock state, the input and the confidence.

BPM Detector in the expanded Dynamic Island, showing the locked state, the iPhone microphone input, 128 BPM and the confidence meter — In the Dynamic Island. The compact island shows the tempo beside the app's icon. Expanded, it adds the lock state, the input and the confidence.

Who it is for

DJs use it to check the tempo of a song before they mix it in, and musicians use it as a BPM counter to find the speed of a track they want to play along to. Point the phone at the speakers and it shows the tempo in beats per minute within seconds.

VJs and lighting operators send that tempo to Resolume, TouchDesigner or a lighting desk, so visuals and lights stay on the beat of a set they do not control.

Also included

Pick your input. Listen through the phone's microphone or any input connected to it.
Action Button. Start and stop listening from the Action Button, with the app out of sight.
Set it up your way. Choose where each output goes and trim its timing in the settings.
Fix a wrong tempo. Double or halve it with ×2 and ÷2, or tap on the downbeat to line the beat up with the room.

Try the same beat tracker in the online BPM detector.

Open the online BPM detector

Requirements

System: iPhone with iOS 16 or later.
Access: Microphone access.

Get it for Mac instead

Technical details in the docs · About the beat tracker