If you want a guitar tuner that is easy to open on a phone or smartwatch, a small local web app can be more practical than a native installation. The hard part is not drawing six buttons. It is keeping the local setup reproducible while making the browser experience usable on a small screen.

This tutorial walks through the current main branch of Guitar Tune Trainer , an MIT-licensed open-source project owned by Fernando Paladini . You will install the project, start its PostgreSQL service, run the checks and production build, and understand what the repository currently does and does not provide.

TL;DR

The project is a React and Vite front end served by an Express application.…