Hears your real guitar or bass through the microphone: no cables or MIDI.
Guitar and bass practice app for iPhone and iPad
Fretwalk
Scale practice that listens, for guitar and bass on iPhone and iPad.
Overview
What Fretwalk is and why it exists.
Fretwalk turns scale practice into something you can measure. Pick a scale, play it on your real guitar or bass, and Fretwalk hears every note through the iPhone or iPad microphone. Each note turns green when you hit it and flashes red where you most likely played instead, right on the fretboard. Guided sets take you from your first pentatonic box to modes and bass groundwork, and every run is tracked so you can see your accuracy improve. A built-in tuner, 17 scales in any key and 14 tunings round it out. No cables, no account, no ads.
Highlights
Why people love Fretwalk.
Every note turns green when right and flashes red where you went wrong.
Guided sets: pentatonic boxes, blues, major 3NPS, modes, minor colors, warm-ups and bass groundwork.
17 scales in any key, by box position, whole neck or single string.
Progress tracking: accuracy, streaks, notes per minute, trouble notes and a 12-week calendar.
A tuner with auto string detection, chromatic mode and A4 from 430 to 450 Hz.
Guitar and bass, 14 tunings including 7-string and 5 or 6-string bass, left-handed.
Audio is analyzed on device and never recorded. No account, no ads, no tracking.
The story
From problem to product.
The problem
Practising scales alone gives no feedback: it's hard to know which notes you missed, or whether you're actually getting better.
The approach
Listen to the real instrument, check every note against the scale as you play it, and keep a record of accuracy, streaks and trouble notes over time.
Under the hood
How it came together.
Scope
What the product covers, end to end.
- Guided practice sessions with a metronome, resume and custom sets.
- Scale explorer with free play, note and interval labels and a full-screen fretboard.
- Progress history with streaks, trends and per-set and per-scale results.
- Tuner and instrument, tuning and sensitivity settings.
Technology
How it is built and kept running.
- Flutter for iPhone and iPad with a small native audio bridge in Swift (AVAudioEngine).
- YIN pitch detection computed with an FFT, accurate to 3 cents from low B on bass to high D.
- A note tracker with pick-attack detection, so repeated notes count.
- On-device storage only.
Role & delivery
What NashSaint designed, built and shipped.
- Product design and engineering.
- Practice curriculum and audio signal processing.
Outcomes
The difference it makes.
- 01 Know exactly which notes you missed, while you play.
- 02 See scale accuracy improve week by week.
Need a hand?
Questions about Fretwalk?
Send a support request and you will hear back by email. Privacy and terms are always one click away.