Note Pierce is installed
Hi. I build Note Pierce and everything else at Crescendo Companion on my own, because I wanted ear training that lives next to the tabs I already have open. Ten questions is a round. That is the whole idea.
New extensions start hidden behind the extensions menu, and a hidden icon is easy to forget. Click the puzzle-piece icon to the right of the address bar, find Note Pierce, and press the pin (on Firefox, the gear, then "Pin to Toolbar"). It stays next to the address bar for good.
Click the ear icon. Pick Intervals, tap the first level, and a round starts. Each question plays, you pick a chip, and the piano shows the notes that played. Replay is free; only the answer counts. Keys 1–9 answer, R replays, Enter moves on.

Get 8 of your last 10 right and the next level opens. Six modules, 160 levels: intervals, chords, scales, progressions, inversions and rhythm. The first three levels of every module are free.

Every wrong answer is remembered as a sound, not a level. Weak Spots shows what needs work, and Review brings each one back when it is due. You practice the thing you got wrong, not a whole lesson again.

Two intervals you keep confusing? One rhythm that never lands? Custom drill lets you pick the material, root, direction, octave range and tempo, and save it with a name.

A full walkthrough of every screen, longer than you need for a first round.
Stuck, or something looks wrong?
Email crescendocompanion@gmail.com or read the support page.
Reading this without the extension?
It is free to install. Ten questions, one minute.