Online metronome

Start at a tempo where the passage comes out clean, even much slower than the real one, and only go up a few BPM once you play it without mistakes. Subdivisions (eighths, triplets, 16ths) let you hear where the fast notes land; accents, which you change by tapping the beats, keep count of the bar for you. If you play loud or have no headphones, turn on the screen flash.

It's “Speed trainer” under Training: choose how many BPM to add, every how many bars and up to what tempo, and the metronome speeds up on its own until it reaches the target; if the target is lower than the starting tempo, it slows down. There's also “Muted bars”: some bars play and some stay silent, so you hear whether you're keeping time or the click is. Both start when you press Start.

Play the song and tap Tap in time for a few beats: the metronome takes the tempo of your taps. Then fine-tune it with − and +, by dragging the number or with the scroll wheel, from 20 to 300 BPM. Save your songs' tempos in the Setlist: one tap and the metronome starts from there.

It works in the browser, on iPhone, Android and computer, with no account and no app to install. While it plays the screen stays on, where the browser allows it; on a computer the space bar starts and stops it. Your settings and setlist stay saved in this browser.