About fr3t.app
fr3t.app is a free, interactive fretboard trainer for guitar, bass and ukulele, built for musicians who want to understand the instrument — not just memorize shapes. Whether you play 6- or 7-string guitar, 4- or 5-string bass, or ukulele, the tool adapts to your setup and helps you see how scales and chords connect across the entire neck.
What You Can Do
The app includes 32 scale patterns (major, minor, pentatonic, blues, all seven modes, harmonic minor, melodic minor, whole-tone, diminished), 41 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 lets you hear scales and chords as you explore them. 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 configurable note-finding exercises and interval training challenges. 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.
On ukulele, pick high-G, low-G, baritone (DGBE), D tuning or open C. Choose any chord to see several playable shapes with finger numbers, a difficulty label and the lowest sounding note, then hear the shape or add it to a progression. See the ukulele fretboard and baritone ukulele chords.
What It Doesn't Do
fr3t.app does not listen through your microphone, so it is not a tuner and it cannot score your playing: practice answers are tapped on the fretboard. It does not identify chords from notes you enter or convert tabs between instruments, and the CAGED system is a guitar view. Sounds come from built-in synthesized and sampled voices rather than instrument-specific recordings.
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 guitar, bass and ukulele players internalize the fretboard so they can play with confidence in any key, any position, and any style.
Built and Maintained
fr3t.app is maintained as a private project. The public app is free to use, and development is guided by practical practice workflows for guitarists, bassists, ukulele players, and teachers.
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.