Paste the chords of a song and see which key they belong to. Get ranked major and minor keys, roman numerals for every chord and the full set of diatonic chords.
Orange chords are outside the key (borrowed, secondary or chromatic).
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Knowing the key tells you which capo position or new key will suit your voice.
Pick the right scale to play over the changes instead of guessing.
Roman numerals reveal the patterns that songs share across keys.
Every major and minor key has a set of seven chords built from its scale. The finder checks each of your chords against all 24 keys: a chord whose root and quality both fit scores a full point, and a chord whose root is in the scale but whose quality differs scores a little. Dominant seventh chords on the fifth degree add extra weight, because they point strongly to a tonic.
Songs usually start or end on the home chord, so the first and last chords get a bonus when they match the key's tonic. This is what separates a major key from its relative minor, which share the same chords. When the two are close, the result tells you so.
C major and A minor share every chord. The tonic decides which is home.
Minor keys often use a major V chord, such as E in A minor, which is counted as in key.
Chords such as bVII in a major key are common in pop and rock and are flagged, not rejected.
Major, minor (m, min, -), 7, maj7, m7, dim, aug, sus2, sus4, add9, 6, 9, 11, 13, half-diminished (m7b5) and slash chords like G/B.
The major key and its relative minor use the same chords. If the progression does not clearly start or end on one tonic, both are plausible. Listen for which chord feels like home.
Enter each section separately. A modulation mixes two keys and lowers the confidence score.
It reports the closest major or minor key. A Dorian song usually shows as its relative major with the minor tonic as a close match.
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