I can’t count how many hours I’ve spent staring at a keyboard or piano roll trying to figure out which chords actually work together.
So I built KeyLens. Pick a key and scale, and it hands you every chord that belongs there. Experiment with extensions, inversions and borrowed chords to build your progression, Pull up a chord chart with piano diagrams so you can actually sit down and play what you wrote.
Most people making music aren’t classically trained, me included. I can’t count how many hours I’ve spent staring at a MIDI keyboard or piano roll trying to figure out which chords actually work together.
So I built KeyLens. Pick a key and scale, and it hands you every chord that belongs there. Experiment with extensions, inversions and borrowed chords to build your progression, Pull up a chord chart with piano diagrams so you can actually sit down and play what you wrote.
This app is still in development, I intend to add sounds and fretboard diagrams for guitar and ukulele in subsequent updates.
KeyLens is built with React Native and Expo 55. The audio engine uses react-native-audio-api by Software Mansion.
Links
iOS App Store: https://apps.apple.com/us/app/keylens/id6761850903
Web: keylensapp.com
Android: I need 12 internal testers to get this on the Play Store. If you're interested in trying it out, DM me your Gmail and I'll add you.