Free online chord ear trainer

Being able to tell chord types apart by ear is what lets you follow a song, improvise over it, or work out its harmony without sheet music. It is a step up from hearing single intervals, because a chord is several notes at once and you are learning its overall colour rather than one distance. This trainer plays a chord and asks you to name its quality, building that skill rep by rep. Below is what you are listening for and how to train it efficiently.

How it works

Press play to hear a chord, then pick its type from the buttons — major, minor, diminished, augmented, or one of the sevenths. You get instant feedback, the next chord plays, and your score tracks progress. Replay as often as you like; sitting with a chord and letting its character register is exactly the point.

What chord quality means

A chord’s quality is the particular stack of intervals built on its root, and it is what gives the chord its character regardless of which note it starts on. That is what makes it learnable by ear: a major chord has the same bright quality whether it is built on C or on F, so you are recognising a colour, not a specific set of notes. If you want to see how each quality is put together before training it, the chord finder lights up the notes of any chord and names it.

Listen for the colour first

The fastest way in is to judge the overall feeling before trying to name the chord exactly. Major sounds bright and settled; minor sounds darker and more serious; diminished sounds tense and unstable, as if it needs to move; augmented sounds strange and unresolved, almost dreamlike. Sorting a chord into one of those broad feelings first, then narrowing down, is more reliable than trying to name it cold.

Major versus minor: the key distinction

The most useful thing to master is telling major from minor, because it covers most of the chords in popular music. The only note that differs between them is the middle one — the third — which sits a half step lower in a minor chord and is the entire reason it sounds darker. Train that pair until it is instant, and you already understand most of what you hear. Because the difference is a single interval, spending time on the interval ear trainer first makes the major-versus-minor distinction click faster.

Sevenths and the richer chords

Once triads are secure, the sevenths add another layer. A dominant seventh sounds bluesy and restless, wanting to resolve; a major seventh sounds warm and lush; a minor seventh sounds mellow and smooth. These are everywhere in jazz, soul, and pop, and they are easier to hear once the plain major and minor triads underneath them are familiar, since a seventh chord is a triad with one more note added on top.

Block chords and arpeggios

A chord can be played with all its notes at once, called a block chord, or one note at a time, called an arpeggio. Hearing a chord broken into an arpeggio makes its individual notes — and therefore its quality — easier to pick out, which is a useful way to check yourself when a block chord is hard to read. The notes are the same either way; only the presentation differs, much as a single interval can be played together or in turn.

Inversions: the same chord, different bass

A chord keeps its quality no matter which of its notes is on the bottom, so a major chord still sounds major whether its root, third, or fifth is lowest. That reordering is called an inversion, and while it changes the chord’s colour slightly, the underlying quality you are naming stays the same. Early on, chords are easiest to identify in root position, with the root at the bottom; as your ear sharpens, you learn to hear through an inversion to the quality underneath, which is what real music constantly asks of you.

Hearing chords in a progression

In practice, chords rarely appear alone — they move in progressions, and part of the skill is hearing how one chord pulls toward the next. A chord that feels like a resting point is likely the home chord of the key; one that feels tense and eager to move is often the dominant that leads back to it. Naming isolated chords here is the groundwork; from there, listening for how chords function in a sequence is how you learn to follow and predict the harmony of a whole song.

Beyond triads: extended and suspended chords

Once the four triad qualities and the sevenths are familiar, richer chords become approachable by ear. A suspended chord sounds open and unresolved, waiting for a note to fall into place; added-note and extended chords like ninths sound lush and full. You do not need to name every one precisely to make use of your ear — hearing that a chord is “some kind of major with extra colour” is already enough to play along, and the exact label can come later.

Common confusions

A few pairs trip people up at first, and knowing them helps. Minor and diminished can sound alike because both are dark, but the diminished is tenser and more unstable — it sounds like it cannot sit still. Augmented and major both have a bright top, yet the augmented sounds stretched and unresolved where the major sounds at rest. And a dominant seventh is easy to hear as “a major chord with something restless added”. When two options feel close, lean on that difference in tension rather than trying to hear every note.

From naming chords to playing along

The reason to train this is practical: it is how you play along with music you have not seen written down. Once you can hear that a song has moved to a minor chord, or that a bright chord has turned restless and wants to resolve, you can follow the changes and join in — comping, improvising, or working out the harmony by ear. Naming isolated chords here is the drill; hearing them roll past in a real song, and keeping up, is the skill it is building toward.

How to train it

Start with just major and minor, add diminished and augmented once that pair is automatic, and only then bring in the sevenths. Judge the broad colour before naming the exact type, and keep sessions short and frequent, since ear skills build through regular reps rather than occasional long stretches. Playing each chord on the virtual piano after you name it, and checking its make-up in the chord finder, ties the sound to a shape you can see and speeds the whole process up.

Ways to practise with it

• Master major versus minor first — it is the most common and most useful distinction.
• Sort each chord by its overall colour — bright, dark, tense, strange — before naming it exactly.
• Add diminished, augmented, and the sevenths only once the basic triads are automatic.
• Keep sessions short and frequent, and play chords you identify on the virtual piano to reinforce them.