Free Music Tools
Small, fast, free tools for everyday guitar problems — transposing, tempo, intervals, tuning. No account needed, and every one links into the full interactive fretboard when you want to go deeper.
Paste a song's chords, shift them to any key, and get the capo shortcut so you can keep your shapes.
Stuck on F or any barre chord? Get honest easier versions — small grips, the capo trick, the two-finger cheat.
Ten essential scales × twelve keys: notes, formulas, famous songs — every one free on the interactive fretboard.
Intervals, scale & chord formulas, every key's chords, progressions and the circle of fifths — printable.
Tap along with any song to find its tempo — with the classical tempo name to match.
Pick two notes, get the interval name and semitone count — and actually hear it.
Every note's frequency in Hz across nine octaves, with an adjustable A4 reference.
Put a live, playable chord diagram on your own website with one line of HTML. Free.
Type in a song's chords and get its key instantly, with the reasoning explained.
Tune by microphone with a precision needle, or by ear with reference tones.
Tempo, time signatures, per-beat accents and a visual pendulum.
Any chord with real fingerings on guitar, ukulele, bass and piano.
Any scale across the whole neck, colored by interval, with audio.
Why these are free
ThunderFret is an interactive fretboard that teaches guitar theory by lighting it up on a real neck — and with Pro it even hears you play through the mic. These small tools solve the everyday problems around that: what key, what tempo, what interval, how do I transpose. Use them freely; if one helps, the full tool is one click away.
This is one small slice of ThunderFret — the full interactive fretboard does chords, scales and ear training for free, and with Pro it even hears you play through the mic.
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