I occasionally pick up a guitar, and often want some help visualizing where various positions are in a given key; for example, I might want to see where the 3rd and the 7th are, while working through a progression.

Click a note on the fretboard to change the key. The arrows at the top shift the fretboard left or right. Click the numbers below the fretboard to toggle which steps in the scale are highlighted.

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Highlight steps: