How to Use AI Coding Tools to Build a Basic App in 24 Hours

Building an app in 24 hours sounds like a challenge straight out of a hackathon, right? But with the rise of AI coding tools, what once required extensive coding knowledge can now be tackled by anyone willing to dive in. In 2026, these tools have become more sophisticated and accessible, making it possible for indie hackers and solo founders to create functional applications in a day. Here’s how we did it and what you need to know to replicate our success.

Prerequisites: What You Need to Get Started

Before diving in, you’ll need a few essentials:

1. Basic Understanding of App Development: While AI tools can do much of the heavy lifting, it helps to know the basics.
2. A Code Editor: We recommend Visual Studio Code. It’s free and has great extensions.
3. AI Coding Tools: You’ll need access to a few AI tools that assist with coding. We’ll break these down below.
4. A Clear Idea: Decide on a simple app idea that you can realistically build in 24 hours.

Time Estimate: 24 Hours to App Launch

You can finish this entire process in about 24 hours, but be prepared for some late-night coding sessions. Here’s a rough breakdown of how to allocate your time:

• Hour 1-2: Planning your app and setting up your environment.
• Hour 3-12: Using AI tools to generate code and build features.
• Hour 13-20: Testing and iterating on your app.
• Hour 21-24: Final touches and deployment.

Essential AI Coding Tools for Your App

Here’s a list of AI coding tools that we found invaluable in our 24-hour app-building journey:

| Tool Name | Pricing | Best For | Limitations | Our Take | |--------------------|--------------------------|--------------------------------|-----------------------------------------|--------------------------------------| | GitHub Copilot | $10/mo | Code completion and suggestions | Limited context understanding | We use it for getting quick code snippets. | | Replit | Free tier + $20/mo pro | Collaborative coding | Performance issues with heavy apps | We love the collaborative features. | | OpenAI Codex | $0-100/mo (based on usage)| Code generation | Can produce incorrect code | Use it for generating boilerplate code. | | Tabnine | Free tier + $12/mo pro | Code autocompletion | Limited language support | It helps speed up our coding significantly. | | Ponic | $29/mo, no free tier | Full-stack app generation | Less customizable than expected | We found it useful for setting up the backend quickly. | | Codeium | Free | Code suggestions | Not as robust as others | Great for beginners; we use it for learning purposes. | | CodeGeeX | Free tier + $15/mo pro | Learning and prototyping | Slower response times | Good for brainstorming solutions. | | AI Dungeon | Free | Idea generation | Not suitable for serious projects | Fun for brainstorming app ideas. | | AIDE | $25/mo | Android app development | Limited to Android | We didn't use it but it's worth mentioning. | | FlutterFlow | Free tier + $30/mo pro | No-code app building | Limited customization | We use it for quick prototypes. |

What We Actually Use

In our stack, we primarily rely on GitHub Copilot and Replit. They strike a balance between power and usability, which is critical when you're racing against the clock.

Step-by-Step Guide to Building Your App

Step 1: Define Your App's Purpose

Spend the first hour defining what your app will do. Keep it simple—maybe a to-do list or a weather app. Write down the key features you want to implement.

Step 2: Set Up Your Development Environment

Install Visual Studio Code and set up the necessary extensions. Make sure you have access to your chosen AI tools.

Step 3: Generate Initial Code

Using GitHub Copilot, start generating the boilerplate code for your app. For example, if you’re building a to-do list app, ask it to create the basic HTML structure.

Step 4: Build Features with AI Assistance

As you start coding, use tools like OpenAI Codex to generate specific functions (like adding or deleting tasks) or to troubleshoot issues.

Step 5: Test Your App

Allocate time to test each feature as you build it. Use Replit’s collaborative features to share your code with a friend for feedback.

Step 6: Deploy Your App

Once you’ve tested everything, deploy your app using a service like Vercel or Netlify. This can often be done in less than an hour.

Troubleshooting: What Could Go Wrong

1. Code Errors: AI-generated code can sometimes be incorrect. Always double-check and test thoroughly.
2. Deployment Issues: Ensure your environment variables are set correctly; otherwise, your app might not work as expected.
3. Feature Overload: Stick to your original plan; adding too many features can cause delays.

Conclusion: Start Here

Building an app in 24 hours is totally possible with the right tools and mindset. Start with a simple idea, leverage AI coding tools to do the heavy lifting, and don’t forget to test as you go. Our recommendation? Start with GitHub Copilot and Replit for a solid foundation.