About fr3t.app

fr3t.app is a free, interactive guitar and bass fretboard trainer built for musicians who want to understand the instrument — not just memorize shapes. Whether you play 6-string guitar, 7-string, 8-string, or 4/5/6-string bass, the tool adapts to your setup and helps you see how scales, chords, and the CAGED system connect across the entire neck.

What You Can Do

The app includes over 25 scale patterns (major, minor, pentatonic, blues, all seven modes, harmonic minor, melodic minor, whole-tone, diminished), 30+ chord types (triads, 7ths, 9ths, 11ths, 13ths, altered, suspended, power chords), and a color-coded CAGED position system so you can see how one pattern connects to the next across the fretboard.

Audio playback uses the Web Audio API so you can hear every scale, chord, and arpeggio as you explore it. The built-in chord sequencer lets you arrange progressions from scratch or load common templates like ii–V–I, 12-bar blues, or pop progressions, then practice soloing over them at any tempo with the metronome.

Practice modes include note-finding exercises and ear training challenges that adapt to your skill level. Every feature works in your browser - no download or sign-up required. You can install fr3t.app as a Progressive Web App for quick access from your home screen.

Why It Exists

Most fretboard tools show you a diagram. fr3t.app goes further by giving you an interactive, audible, and connected view of how music theory actually works on a fretboard. The goal is simple: help guitarists and bass players internalize the fretboard so they can play with confidence in any key, any position, and any style.

Open Source

fr3t.app is open source on GitHub. If you find a bug, have a feature idea, or want to contribute, you are welcome to open an issue or pull request.

Support the Project

fr3t.app is free to use and will stay that way. If the tool helps your playing, you can buy the creator a coffee to help cover hosting costs and support future development.