How it works
A triplet metronome splits each quarter-note beat into three even clicks, the first one louder: eighth-note triplets. The number counts the beats, so triplets at 80 click as fast as a plain metronome at 240.
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Start
Tap the pad, or press Space. One large dot and two small ones make each beat. No bar is marked, so the beats fit 3/4 as readily as 4/4. Tap again to stop.
Change the tempo
Tap the number under the pad and type the tempo of the beat, 81 or 112 say, or use minus and plus. Any whole tempo from 1 to 333 plays.
Questions and answers
What is a triplet beat on a metronome?
A beat cut in three where a simple meter such as 4/4 cuts it in two. Open Music Theory says the division is sometimes seen as borrowed from compound meter, and writes a 3 over the notes. This triplet beat metronome sounds all three evenly.
How are triplets counted with a metronome?
Usually one la li, two la li: the count Open Music Theory's chapter Other Rhythmic Essentials gives for triplets. Say the number on the louder click and la and li on the two ticks.
How fast are triplets at 150 BPM?
450 clicks a minute, three for each of the 150 beats. Past 400 clicks a minute the dots stay lit and no longer take turns, so above 133 beats a minute the louder click is the guide.
Can it click quarter-note triplets?
Yes, at half the number. Wikipedia's Tuplet article has three triplet quarter notes lasting as long as one half note, so for a piece at 80 type 40: each louder click is then a half note. The quarter-note beats in between are not clicked.
Why can't I hear the metronome?
Three things to check on a phone: the ring switch, the volume, and whether Bluetooth headphones have taken the sound. The six dots, a large one and two small for each beat, show the triplets in silence.