Intermittent Fasting Timer

⏱️

Build an "Intermittent Fasting Timer" in 15 Minutes

Most commercial health trackers are bloated with subscription walls, mandatory account logins, and clutter. Users don't want a complex social network—they just want to press a button and see when they can eat. Today, we'll build a lightweight, offline-first Android timer from scratch with no prior coding experience required.

🎮 Test & Configure the Working App

If you want to see teh code, copy the code for your own project it's at GitHub, click the View code buttons.

To download and use the app created using AI at Google AI Studio use the Google Play link for testing by clicking the Download to Android Button.  Note:  The interface may different and match your device's default styling.
 

Video Preview → Download to Android →

💡 The Opportunity: Why Build This?

• The Problem: Popular fasting apps push $40/year memberships, calorie logs, and aggressive push notifications just to track simple hours.
• High-Intent Search Traffic: Users frequently search terms like "fasting timer," "16 8 intermittent fast," "simple fasting clock," and "zero calorie tracker."
• Predictable User Retention: Intermittent fasting requires daily habits. A user will open this app twice a day—once to start the timer, and once to break their fast—giving you consistent daily engagement with zero complex content maintenance.

🎯 How the App Works

Simplicity is your competitive edge. Instead of confusing screens, the user interface follows a single, intuitive flow:

1. Fast Selection: A selector lets users pick standard fasting intervals (16:8, 18:6, or 20:4).
2. One-Tap Activation: Tapping a large "Start Fast" button records the exact start timestamp.
3. Dynamic Dashboard: The screen transitions to a clean circular progress ring showing elapsed time, hours remaining, and the exact target completion time (e.g., "Break fast at 1:30 PM").

🤖 The Magic Prompt (Copy & Paste)

Copy the prompt below and paste it directly into your AI coding tool (such as Google AI Studio or your chosen IDE assistant):

Write a native Android app in Kotlin using Jetpack Compose. Build a clean, minimalist intermittent fasting timer app. Core Requirements: 1. Provide a dropdown or segment toggle for common fast ratios: 16:8, 18:6, and 20:4. 2. Include a prominent 'Start Fast' button. 3. When active, transition the UI to display a circular countdown timer with elapsed hours and remaining time. 4. Calculate and clearly display the exact 'Target End Time' (e.g., "You can eat at 2:00 PM"). 5. Save the start timestamp in local storage (DataStore or SharedPreferences) so the timer resumes accurately even if the device restarts or the app is killed. 6. Trigger a local push notification when the fasting window is completed. Keep all logic entirely offline with no mandatory account creation.

🚀 Beginner 4-Step Launch Checklist

Step 1: Test Local Persistence 🔍

Start a fast inside the preview emulator, close the app completely, and reopen it. If the timer resets back to zero instead of reading your active fast, tell the AI: "The timer reset when closed. Ensure the app checks local storage on startup and computes the difference between current time and the saved start timestamp."

Step 2: Export the Build Bundle 📦

Export your project as an Android App Bundle (.aab). This format optimizes asset delivery for different screen sizes on Google Play.

Step 3: Craft Your Store Listing ✍️

Emphasize your core advantages in the title and description: "No Account Required," "Offline-Friendly," and "100% Free." These keywords directly target users frustrated by complex, subscription-heavy alternatives.

Step 4: Upload and Publish 🎉

Upload your .aab file to your developer console, complete the simple privacy questionnaire (highlighting no data collection), and send your app to review