HIIT Timer – Interval Workout App

A simple and effective HIIT (High-Intensity Interval Training) timer application built with React Native and Expo. This app allows you to create, manage, and run your own custom HIIT workouts.

Features

• Create and save custom workouts (warm-up, work, rest, rounds, cool-down)
• Clean, dark, distraction-free UI
• Voice cues and sound/haptic alerts on phase changes
• Quick Start session without saving a workout
• Background persistence: resume an in-progress workout
• Keep-awake during active sessions (optional)
• Android-focused (EAS build profiles configured)

Tech Stack

• React Native 0.81, React 19
• Expo SDK 54 (expo-router, expo-keep-awake, expo-splash-screen)
• TypeScript
• Zustand
• react-native-reanimated, react-native-gesture-handler
• expo-audio (preferred), expo-speech
• AsyncStorage persistence

Getting Started

To get a local copy up and running, follow these simple steps.

Prerequisites

• Node.js (LTS)
• bun
• Expo CLI and EAS CLI
• Android Studio (emulator) or Android device

Installation

1. Clone the repo

   git clone <repository-url>

2. Install packages

   bun install

Available Scripts

In the project directory, you can run:

• bun start — Start Expo dev server (Metro)
• bun run android — Run on Android emulator/device
• bun run web — Run in a web browser
• bun run lint — Lint with ESLint
• bun run eas:build:android:dev — EAS dev client build (APK)
• bun run eas:build:android:preview — EAS internal test build (APK)
• bun run eas:build:android:prod — EAS production build (AAB)
• bun run eas:submit:android:prod — Submit production build to Google Play