Tools built because I needed them.
Three kinds of thing live here. Trainers that teach you the guitar fretboard. Education apps that teach a kid fractions and times tables. And a calculator that works out Colorado vehicle sales tax without a spreadsheet. They have nothing in common except that I got tired of doing all three by hand.
Guitar fretboard trainers
Find the capo fret for any key change, free. Learn the three notes inside every chord, move one shape through all five CAGED positions, and see every scale across the whole neck.
Capo Trainer free · all seven for $15.99 a year
Math apps for kids
Two education apps built at the kitchen table: a fraction wheel you turn with your finger, and times tables practice that keeps going until the answers come without counting.
Free — open in your browser
Colorado dealer sales tax
Scan the buyer's license, get state, county, city and special district tax from their address, and print the DR 0024 without reaching for a rate table.
By subscription
Who makes these
Dye Industries Inc. is a Colorado corporation. I run a used car dealership, use these apps myself when I pick up the guitar, and write small programs to fix things that annoy me. Everything here is built and supported by one person, which is why the tools are narrow and the prices are low.
Questions before you buy are welcome: dyeman72@gmail.com.