Use the free Chord Ear Trainer below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
Hear a chord and know what it is
Recognising single notes by ear is useful. Recognising whole chords by ear is what lets you follow a song in real time, because songs are built from chords, not from isolated notes. This chord ear trainer plays one hidden chord and asks you to name its quality: major, minor, major 7, minor 7, dominant 7, diminished, or augmented. The root note is revealed after you answer, so the question stays focused on the quality, which is the part most ears find hardest. If you can tell a major chord from a minor chord without looking, you can follow most songs. If you can also tell the seventh chords apart, you can follow almost all of them.
The differences between chord qualities are smaller than beginners expect, and that is why training helps. A major and a minor chord differ in exactly one note, the middle one, moved by a semitone. A major 7 and a dominant 7 chord differ in exactly one note as well, the top one. Your ear has to notice a single changed note inside a stack of three or four, and at first it will not. That is normal. The training works by giving you many examples with instant answers, so your ear gradually learns to listen for the note that decides the quality instead of hearing the chord as one blurry sound.
How to practise effectively
Start by learning the two big families: major and minor. Play several questions and focus only on whether the chord sounds bright or dark. Bright usually means major, dark usually means minor, and that rough rule will carry you through most early questions. Once that distinction feels solid, start listening for the seventh chords. Major 7 chords sound dreamy and settled, like a chord that could float forever. Dominant 7 chords sound restless, like they want to move somewhere. Minor 7 chords sound mellow and soft, the sound of a lot of soul and jazz ballads. Giving each quality a feeling-word like these makes it easier to remember than a technical definition.
Diminished and augmented chords are rarer, and they sound stranger on purpose. A diminished chord sounds tense and tight, because its notes are stacked in small, even steps. An augmented chord sounds dreamlike and unstable, because its notes are stacked in large, even steps. You will meet both less often than major and minor chords, but when they appear in a song they are usually the most interesting moment, so recognising them pays off out of proportion to their frequency. If you keep confusing two qualities, practise them as a pair: generate questions until both appear, and listen to them back to back after answering.
From guessing to knowing
Every ear trainer user goes through the same stages. First, everything sounds the same and the score stays low. Then, one quality clicks, usually major versus minor, and the score jumps. Then progress slows again as the seventh chords blur together. Then those click too, one at a time. The plateau in the middle is not failure; it is the stage where your ear is reorganising what it hears, and it passes with continued short sessions. The streak counter in the tool is designed for this stage: it rewards a run of correct answers, which is exactly what a reorganising ear produces in bursts before it becomes consistent.
A useful extra exercise is to play a chord on your own instrument after answering, using the revealed root and quality. Hearing the same chord from a real instrument, after hearing it from the tool, connects the two sounds in your memory. Another is to listen to a song you like and try to name the chord quality at the start of each bar, even if you cannot name the root yet. Quality alone is enough to follow a song’s emotional shape, and it is a satisfying way to use the skill outside the practice page.
Who benefits most
Guitarists who play from chord charts benefit because they can check whether the chart matches what the recording actually plays. Keyboard players benefit because chord qualities decide which voicings sound right. Singers benefit because harmony singing requires hearing the chord you are singing over, not just your own note. Songwriters benefit most of all, because choosing a chord quality is a compositional decision, and you cannot choose well what you cannot hear. You need no instrument and no theory background to start: the tool plays the chord, you guess, and the answer teaches you. Nothing is uploaded, and your scores exist only while the page is open.