MusicToolLab

Free Online Tools for Musicians

MusicToolLab provides fast, simple, and free tools for musicians and songwriters. Transpose guitar and piano chords, find song tempo with our Tap BPM tool, calculate guitar capo positions, convert progressions into Roman numerals or Nashville numbers, and explore the interactive circle of fifths.

Tap BPM Tool
Tap along with your song to instantly calculate tempo (BPM) for your DAW or metronome.
BPM Finder
Upload audio and detect tempo (BPM) in your browser.
Chord Finder
Select notes and instantly identify the chord (major, minor, 7th, sus, dim, aug, and more).
Chord Transposer
Transpose guitar and piano chords to any key instantly. Perfect for singers and capo users.
Chord Progression Generator
Generate chord progressions in any key with Roman numerals + Nashville numbers. Great for songwriting.
Capo Finder
Find the correct capo fret and chord shapes to play in any key on guitar.
Circle of Fifths
Interactive circle of fifths chart with major scales and diatonic chords.
Roman Numeral Converter
Convert chord progressions into Roman numerals (I, IV, V, vi) in any key.
Key Finder
Upload an audio file and estimate its key (major/minor) with confidence — runs locally in your browser.
Scale Finder
Generate scales and diatonic chords instantly (major, minor, modes, pentatonic, blues).
Song Idea Generator
Generate creative, edgy song prompts + key, BPM, chords, hook ideas, and structure.
Free AI Lyrics Generator
Generate verses, choruses, and bridges instantly for country, pop, rock, hip-hop and more.

Learn & Improve Your Songwriting

Looking to improve your craft? Explore our in-depth Songwriting Guides and discover our full collection of AI Songwriting Tools designed specifically for musicians.