Fretz

Fretz is a native iPhone and iPad songbook for guitar and ukulele players. It keeps chord sheets and tablature together in a searchable library designed for practice and performance.

Features

• Read chord-over-lyrics sheets and guitar tablature
• Browse a built-in collection of songs
• Import ChordPro (.chordpro, .chopro, .cho, .crd) and MusicXML (.musicxml, .mxl) files
• Paste ChordPro text or import a chord sheet from a URL
• Transpose songs by semitone or find the simplest playable key
• View guitar and ukulele chord diagrams
• Auto-scroll at an adjustable speed and resume where you stopped
• Create and edit songs, then search and filter your library
• Customize the app's appearance, tint, and default instrument

Built With

• Swift and SwiftUI
• SwiftData for local song storage
• AVFoundation for chord playback

Requirements

• iOS or iPadOS 26.0+
• Xcode 26 with the iOS 26 SDK

Run Locally

Clone the repository:

git clone https://github.com/nlevin/fretz.git
cd fretz

Open the project in Bitrig, or generate an Xcode project from Project.json with XcodeGen:

xcodegen generate --spec Project.json
open Fretz.xcodeproj

Select an iPhone or iPad simulator and run the Fretz target.

Project Structure

• App/Models — songs, measures, notes, tunings, and app preferences
• App/Views — the library, readers, chord browser, editor, and settings
• App/Import — ChordPro, MusicXML, compressed MusicXML, and web importers
• App/Chords — chord generation and instrument-specific fingering data
• App/Resources/DefaultSongs — the bundled starter library
• appStoreConnect — App Store listing metadata