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Set the tempo with the slider, the number box or by tapping, choose a time signature and subdivision, then press Start (or hit the space bar). The first beat of each bar is accented so you always know where the one is. Tap tempo averages your last few taps, so you can find the BPM of a song by tapping along with it.
Tap the button or press T along with the beat. The tool averages the time between your last eight taps and converts it to beats per minute. If you stop for more than two seconds, it starts a new measurement.
Each click is scheduled ahead of time on the Web Audio clock rather than played by a JavaScript timer, so a busy page or a slow device doesn’t push the clicks late. A short timer only looks a fraction of a second ahead and queues the next clicks.
The BPM counts the bottom number of the time signature. In 4/4 it counts quarter notes and in 6/8 it counts eighth notes, so 6/8 at 180 BPM plays six eighth-note clicks per bar at 180 per minute.
Subdivisions add quieter clicks between the main beats: two for eighth notes, three for triplets or four for sixteenths. They help you lock in fast passages and keep steady between beats at slow tempos.
Practicing with a click builds steady timing, and recording to a click makes editing and adding parts later much easier. Many players start slower than the target tempo and speed up a few BPM at a time once a part feels solid.