Mapty is a workout-tracking app that integrates geolocation and interactive maps to let users log running and cycling workouts. Built entirely in modern JavaScript using OOP principles, the app leverages the Geolocation API, Leaflet.js, and localStorage to create a fully functional, persistent single-page application. This project showcases my ability to build clean, object-oriented architectures in JavaScript while working with real-world browser APIs and third-party libraries.