Build the rhythm before you need it.
Bystanders default to ~80 BPM. The AHA wants 100-120. Tap any hard surface in time with the click; the phone listens and tells you whether you're hitting the rhythm. Never replaces a real CPR class. This is the rhythm muscle, not the depth or hand placement.
Drill mode · target 110 BPM
Tap the table or your knee in time with the click. The phone listens through your mic and scores you. No audio is ever recorded.
Your tempo
—BPM
Accuracy
—
Tap Start drill, then tap a hard surface in time with the click.
Mic stays on this device. No recording, no upload. Stops the moment you tap Stop.
What to actually practice
- 30 seconds of taps. Stop. Notice if you slowed.
- Try with the phone face-down on a hard surface so the mic catches the tap, not your voice.
- Aim for the in-the-zone band (100-120). Bystanders almost always need to push faster, not slower.
If this is real, not practice:open emergency mode and dial your local emergency number first.