An Android app written in Kotlin for tuning instruments. The app currently supports multiple tunings for:

• Guitar
• Bass
• Tres
• Ukulele

As well as tunings for:

• Violin
• Viola
• Cello
• Chromatic

The tuner allows you to adjust the middle A frequency, allowing you to tune to A = 432 Hz and other tunings. The app also has a feature that allows you to create custom tunings. Download the beta version on Google Play.

• Kotlin - Kotlin programing language
• TarsosDsp - A Real-Time Audio Processing Framework in Java
• Kodein - Painless Kotlin Dependency Injection
• Android Architecture Components - For managing Android UI lifecycle and data persistence.
• RxJava - Reactive Extensions for the JVM
• RxKotlin - Kotlin Extensions for RxJava

• How to calculate the frequencies of musical notes - This article was very helpful for deciding how to model musical notes and the chromatic scale.
• React Native Blueprints - This book has a guitar tuner project that served as the original inspiration for this project.