How to Build a Pomodoro Timer App with Rork — A Complete Beginner's Tutorial

Build Your Own Pomodoro Timer App with Rork

The Pomodoro Technique is one of the most popular productivity methods in the world — work for 25 minutes, take a 5-minute break, and repeat. It's simple, effective, and the perfect candidate for your next app project.

Below, you'll build a complete Pomodoro timer app from scratch using Rork. No coding experience required. Rork's AI handles the code generation, so all you need is a clear idea of what you want your app to do.

• Creating a project and working with Rork's AI
• Implementing countdown timer logic
• Automating session transitions (work, short break, long break)
• Building a circular progress bar for visual feedback
• Adding haptic and sound notifications

Prerequisites and Setup

What You'll Need

• A Rork account (the free plan works fine for this project)
• A modern browser (Chrome or Safari recommended)
• A smartphone for testing (iOS or Android)

Quick Rork Refresher

Rork is an AI-powered app development platform that generates cross-platform React Native apps from natural language descriptions. If you're brand new to Rork, check out the getting started guide first to familiarize yourself with the basics.

Step 1: Create Your Project

Open the Rork dashboard, click "New Project," and enter the following prompt:

Create a Pomodoro timer app.
 
Requirements:
- 25-minute work timer and 5-minute break timer
- Insert a 15-minute long break every 4 work sessions
- Start, pause, and reset buttons
- Circular progress bar showing remaining time
- Vibration notification when a session completes
- Display completed session count
- Clean, dark-mode UI

Rork's AI will interpret this prompt and generate the app's screen layout and code automatically. Preview the generated app to make sure the basics are working correctly.

Step 2: Understand the Timer Logic

The core timer logic that Rork generates uses React Native's useEffect and setInterval for the countdown. Let's walk through how it works so you can customize it later.

// Core timer logic (generated by Rork)
import { useState, useEffect, useRef } from 'react';
 
const useTimer = (initialMinutes: number) => {
  const [seconds, setSeconds] = useState(initialMinutes * 60);
  const [isRunning, setIsRunning] = useState(false);
  const intervalRef = useRef<NodeJS.Timeout | null>(null);
 
  useEffect(() => {
    if (isRunning && seconds > 0) {
      intervalRef.current = setInterval(() => {
        setSeconds((prev) => prev - 1);
      }, 1000);
    }
    return () => {
      if (intervalRef.current) clearInterval(intervalRef.current);
    };
  }, [isRunning, seconds]);
 
  // Format remaining time as mm:ss
  const formatTime = () => {
    const mins = Math.floor(seconds / 60);
    const secs = seconds % 60;
    return `${mins.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
  };
 
  return { seconds, isRunning, setIsRunning, setSeconds, formatTime };
};
 
// Expected output:
// formatTime() → "25:00" (at start)
// formatTime() → "24:59" (after 1 second)
// formatTime() → "00:00" (when finished)

This custom hook manages the timer state. While isRunning is true, it decrements seconds by one every second.

Step 3: Add Session Management

The Pomodoro Technique alternates between work sessions and breaks. Add the following instructions in Rork's chat to implement session management:

Improve the session management:
 
- Automatically switch to a break (5 min) after each work session (25 min)
- Switch to a long break (15 min) after every 4 work sessions
- Display the current session type (Work / Short Break / Long Break) at the top
- Show completed sessions as tomato icons like "🍅 × 3"

Here's the session management logic Rork will generate:

// Session management logic
type SessionType = 'work' | 'shortBreak' | 'longBreak';
 
interface PomodoroState {
  sessionType: SessionType;
  completedSessions: number;
  totalWorkMinutes: number;
}
 
const getNextSession = (state: PomodoroState): SessionType => {
  if (state.sessionType !== 'work') {
    return 'work'; // Always return to work after a break
  }
  // Long break every 4 sessions
  return (state.completedSessions + 1) % 4 === 0
    ? 'longBreak'
    : 'shortBreak';
};
 
const getSessionDuration = (type: SessionType): number => {
  switch (type) {
    case 'work': return 25;
    case 'shortBreak': return 5;
    case 'longBreak': return 15;
  }
};
 
// Expected output:
// getNextSession({ sessionType: 'work', completedSessions: 2, ... })
//   → 'shortBreak'
// getNextSession({ sessionType: 'work', completedSessions: 3, ... })
//   → 'longBreak'
// getNextSession({ sessionType: 'shortBreak', completedSessions: 3, ... })
//   → 'work'

Step 4: Build the Circular Progress Bar

The progress bar is the visual centerpiece of any timer app. Tell Rork to add one with these instructions:

Replace the timer display with a circular progress bar:
 
- Draw a circular progress ring using SVG
- The ring depletes as time runs out
- Use red (#FF6B6B) for work sessions, green (#51CF66) for breaks
- Show remaining time in large text at the center of the ring
- Smooth animation (fluid transition every second)

The circular progress bar works by animating the SVG strokeDashoffset property. Rork generates the entire component for you, so you don't need to know SVG. If you want to push your app's animations further, the Rork animations guide has some great tips.

Step 5: Add Notifications and Feedback

Alerting users when a session ends is essential for a Pomodoro app. Add this to your Rork chat:

Add session completion notifications:
 
- Vibrate (haptics) when a session completes
- Play a short sound effect on completion
- Use different vibration patterns for each session type:
  - Work complete: strong success pattern
  - Break complete: light tap pattern

Rork uses Expo's expo-haptics module to handle vibration feedback:

import * as Haptics from 'expo-haptics';
 
// Session completion feedback
const onSessionComplete = async (sessionType: SessionType) => {
  if (sessionType === 'work') {
    // Work complete: success pattern
    await Haptics.notificationAsync(
      Haptics.NotificationFeedbackType.Success
    );
  } else {
    // Break complete: light tap
    await Haptics.impactAsync(
      Haptics.ImpactFeedbackStyle.Light
    );
  }
};
 
// Expected behavior:
// Work session ends → strong vibration
// Break session ends → light vibration

Step 6: Polish the UI

Time to make your app look great. Give Rork these final instructions:

Polish the UI:
 
- Dark mode (background: #1A1A2E, text: #EAEAEA)
- Fade animation on session transitions
- Show stats at the bottom (total work time today, completed sessions)
- Large, bold system font for the timer display
- Round start button, smaller pause and reset buttons

That's it — your Pomodoro timer app is feature-complete. Use Rork's preview to run the timer through a full cycle and verify everything works as expected.

Common Issues and Fixes

Timer Stops in the Background

React Native's setInterval pauses when the app moves to the background. This is expected behavior. Tell Rork to "make the timer accurate even when the app is in the background" and it will switch to a Date.now()-based elapsed time calculation instead.

Progress Bar Animations Are Choppy

If the animation feels sluggish, ask Rork to "enable useNativeDriver: true for all animations." The native animation driver runs on a separate thread from JavaScript, resulting in much smoother visuals.

Session Count Resets When the App Closes

State is lost when the app is closed by default. Tell Rork to "persist the session count using AsyncStorage" and your progress will survive app restarts.

Taking It Further

Once your basic Pomodoro timer is working, consider adding these features to make your app stand out:

• Task integration: Link tasks to work sessions so you can track what you focused on. The to-do app tutorial covers the fundamentals of task management.
• Stats dashboard: Visualize daily and weekly work time with charts
• Custom durations: Let users adjust work and break lengths to their preference
• Ambient sounds: Add white noise or lo-fi music playback during work sessions

Wrapping Up

In this tutorial, you built a fully functional Pomodoro timer app using Rork — complete with countdown logic, automatic session cycling, a circular progress bar, and haptic notifications.

With Rork's AI-powered development, you accomplished all of this through natural language instructions alone. Start with this tutorial as your foundation, then customize it to make it your own. Build the productivity tool you've always wanted, and sharpen your Rork skills along the way.