Even out your hands and lock your tempo. A clear click with subdivisions helps scales, arpeggios and pieces sit perfectly in time.
Steady time is the skill every other skill sits on. Practising piano with a metronome trains your internal clock, exposes the spots where you rush or drag, and makes everything you play feel tighter. Drumolo's metronome is free, runs in your browser, and shows your timing visually so you can actually see your progress.
Yes — Drumolo is a free online metronome that works perfectly for piano. Open it in your browser, set the tempo and start.
Start slow enough to play it cleanly, then raise the tempo a few BPM at a time. Clean and slow beats fast and sloppy every time.