Listen.

Three of the things you'd otherwise open an app for, all running in this browser tab with nothing to install and no account.

The tuner listens through your device's microphone and reads back the note you're playing, how many cents sharp or flat it is, and a needle — and the panel glows green once you're inside two cents, so you can watch it out of the corner of your eye while you play rather than staring at a number. A can be set to 440 or 442.

The metronome takes a real time signature instead of a beats-per-bar count, which means compound meters are counted the way musicians count them: 6/8 is two dotted-quarter beats, not six eighths. It has tap tempo, an accented downbeat, and subdivisions drawn as actual beamed notes where the single note you're hearing lights up. There's also a latency slider for a Bluetooth speaker or a classroom projector — it delays the picture, never the click, so the beat itself stays exact.

The drones hold any of twelve pitches for tuning and long tones, at 440 or 442 as well.

All of it shares one audio engine with the rest of the site, which is what lets the metronome lock to the backing-track maker's first downbeat and stay there instead of slowly drifting against it.