These are free web apps that help you learn music theory and support composing and arranging.
Every tool here is something the developer found genuinely useful over more than 20 years of making music.
Developer: Yoshito Kimura (KHUFRUDAMO NOTES)
Do you need music theory and technical knowledge to make music?
——— Yes. You do.
Does mastering music theory and technical knowledge take tremendous effort?
——— No. It does not.
Just use "O-TO, the music theory web apps".
Stop spending your mind and your time on things that have nothing to do with the essence of creation.
Every tool (web app) is completely free to use.
202 types can be searched by their information on any root note. It also shows the main related scales and substitute chords based on Negative Harmony theory.
Look up the details of 77 types in every key. It also shows the main related chords.
Search the chord and scale names that match the notes you select.
The MIDI-keyboard version is here.
A collection of 100+ chord progressions (effectively 1,000+ with all 12 keys supported).
They can also be displayed as degree (Roman numeral) names.
A list of diatonic chords. Switch between all 12 keys and check the tensions and modal scales for each chord.
A tool for exploring the relationships between keys. You can choose from 77 types as well as modes.
Calculates the values of 18 note types based on a given BPM. Each can be displayed in seconds, milliseconds, or microseconds.
Easily calculate the BPM at which two different notes share the same duration.
Transpose chord progression text into all 12 keys. It can also convert to degree (Roman numeral) names.
See the fretboard positions of chords and scales on a guitar. It also supports bass, multi-string instruments, and a left-handed display.
Reverse-search the chord and scale names that match the notes you select on the fretboard.
Identify chords and scales from the notes you play on a MIDI keyboard.
A metronome that can play a wide variety of meters. Since you enter meters as text, everything from 4/4 to complex odd meters is easy to set up and check!
A metronome that supports polyrhythms. Understand polyrhythms through both sound and visuals. You can set values from 1 to 32.
Read and play rhythms for your right hand, left hand, right foot, and left foot. Change one part at a time to practice coordination on the drums.
Check piano scales and finger numbers in a fingering chart for your scale practice.