Tools
Small, fast utilities built on the same theory data as the reference pages. Everything runs in your browser.
Transposer
Shift any chord or whole chart by any number of semitones, with sharp or flat spellings.
Songwriting
Interval calculator
Pick two notes and get the interval's name, semitones, cents, and inversion.
Reference
Scale finder
Tap in the notes you're playing and see every documented scale that contains them.
Reference
Theme builder
Design your own site palette from four core colors, with a live contrast check.
ReferenceAbout these tools
Each tool is the reference data with the lookup step removed. The transposer applies the same note math the key pages use, so you can paste a whole chart and move it to a singer's key in seconds — with sharp or flat spellings, your choice. The interval calculator names the distance between any two notes, the skill the intervals section teaches; use the section to learn it and the calculator to check yourself. The scale finder works in reverse: give it the notes a melody or riff actually uses, and it returns every documented scale that contains them, each linked to its page in the scale catalog. And the theme builder restyles this site itself — pick four colors and it derives a full palette, with a live check that your combination stays readable.
Everything runs entirely in your browser: no accounts, no uploads, nothing sent anywhere. Because the tools and the reference pages are generated from one shared, tested data layer, an answer a tool gives you is always the same answer the pages document — so when a result surprises you, follow its link and read the why.