muted.io

muted.io is a free collection of interactive music theory tools and visual references for learning music online. It covers notes, keys, chords, scales, time signatures, BPM, clefs, drum patterns and instrument chord charts, alongside an explanatory guide to concepts such as pitch, timbre, notes, scales, keys, intervals, chords, harmony, melody, rhythm and form.

The site includes tools such as 4/4 and 6/8 time signature references, a BPM counter, key signature and note identification tools, a chord finder, common chord progressions, diatonic scale references, ukulele and basic guitar chord charts, a guitar tuning chart, treble and bass clef references, drum patterns and a paradiddle tool. Scale references include major, harmonic major, double harmonic major, minor, harmonic minor, melodic minor, modes of the major scale, pentatonic and blues scales. A desktop app is also available.

The site is aimed at people learning music theory and music production, at various stages of learning. It is free to use, with an optional donation option to support the site's creator.