How to Make an Android App Using AI (ChatGPT) on Mobile

Creating an Android app on your mobile phone without writing code is now possible using the power of AI like ChatGPT and a handy mobile app called HOP Web App Builder. In this guide, I’ll show you how to generate a fully functional Android app using nothing but prompts and free tools.

What You’ll Learn:

• How to generate app code with ChatGPT

• How to build a Fuel Log & Mileage Tracker App

• How to convert your code into an Android APK

• All steps done 100% on mobile

Step 1: Use ChatGPT to Generate the App Code

Open ChatGPT (you can use the mobile app or web version). Now give it a powerful and clear prompt like this one below. This prompt tells the AI to generate a complete offline mobile web app in a single HTML file — ready to be converted into an APK.

Prompt for ChatGPT:

Create a fully working mobile-friendly single-page web app in a single HTML file using only HTML, CSS, and JavaScript. The app should function as a Fuel Log & Mileage Tracker for car users. The layout must be optimized for mobile screens with modern responsive design (no external libraries). The app must work offline and store data using localStorage so that data is not lost when the app is closed. 

Required Features:

1. A clean and minimal mobile UI with a header: "Fuel Log & Mileage Tracker".
2. A form with input fields:
- Date (default to today)
- Odometer Reading (KM) – number input
- Fuel Added (Liters) – number input
- Total Fuel Cost (PKR) – number input
- A "Save Entry" button

3. Below the form, show real-time calculated stats:
- Total Distance Traveled (from first to last odometer reading)
- Total Fuel Used (sum of liters)
- Total Fuel Cost (sum of cost)
- Average Mileage (KM/L) based on KM difference and liters
- Cost Per KM

4. Display a table of all entries saved (date-wise), with option to delete individual entries.

5. Data must be saved using localStorage and retrieved automatically on page load.

6. Include a "Reset All Data" button that clears everything from localStorage after confirmation.

7. All JavaScript and CSS must be embedded within the same HTML file – no external links or libraries.

8. Use mobile-friendly fonts, input styles, and large tappable buttons.

9. The app should be ready to convert into APK using tools like Appsgeyser or WebView. Avoid file download, camera, or share APIs.

10. Do not use any features that require internet or permissions. Keep the app 100% offline and self-contained.

The final code must be fully functional, neat, and readable. Avoid unnecessary code or comments. Focus on a clean, professional look and working app logic.

What You’ll Get: A complete app in HTML format, designed for mobile screens. You can test it directly in your browser to make sure it works as expected!

Step 2: Install HOP Web App (No Code App Builder)

Now that you have your HTML code, it’s time to turn it into a real Android app (APK).

• Download HOP Web App from below given link. It’s a free, no-code tool that lets you wrap any HTML or web-based app into a working Android application.

HopWeb App Download Link

What is HOP Web App?

HOP Web App is an Android app that helps you:

• Create APK files using your HTML/CSS/JS code.

• Import local HTML files or URLs.

• Customize icons, splash screen, and package name.

• Export signed APK ready for installation.

Convert Your HTML App to APK

Here’s how to do it:

1. Open HOP Web App

2. Tap “Create New App”

3. Paste the HTML code you got from ChatGPT in index.html file

4. Add app name, and other settings

5. Click “Convert Android APK”

Done! You now have your AI-generated mobile app converted into an installable APK.

Final Words

You don’t need to learn Java or Kotlin for these mini apps. You don’t need Android Studio or a laptop. With ChatGPT + HOP Web App, you can now create and convert beautiful, offline-first small Android apps — completely on your mobile phone!

Use this technique to build:

• Fuel trackers

• To-do lists

• Budget planners

• Educational tools

• and more!