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How to Build an App with ChatGPT

build an app with chatgpt

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Artificial intelligence has always shown its potential for bringing new innovations to the things we do in our daily lives. There are many AI-based techniques for developing software models that have fulfilled various purposes and helped accomplish meaningful work. Different kinds of AI models are slowly replacing almost all the possible tasks that were once exclusive to humans.

Humanity is on the cusp of a new technological revolution, and it is poised to harness the full potential of AI through the utilization of conversational AI that humanizes communication between people and machines. One of the most advanced tools in this area is ChatGPT, an AI-based chatbot that aims to evolve the relationship between humans and machines in a way that blurs the lines between the two.

As new models such as conversational AI and generative AI continue to be developed, ChatGPT has become a hot topic for technologists, industries, businesses, and societies at large. ChatGPT is a highly advanced tool that allows non-technical users to access powerful capabilities and reduces the time required to develop applications. Despite some concerns that it may replace human jobs, ChatGPT is going to enhance human cognition, giving us new opportunities to interact with the technology and making tedious tasks like app development easy. The full potential of the tool can be harnessed by developing an app, website, or chatbot. So, ChatGPT app development is soon going to be a new trend.

In this article, we will have a deep understanding of this emerging AI-based chatbot and how we can build an app with ChatGPT.

Introduction to ChatGPT

ChatGPT is a significant step in creating a seamless connection between humans and a chatbot. It goes beyond what one might expect from a conversational AI. The tool is capable of handling complex questions and performing advanced tasks. The model architecture of ChatGPT is based on the Generative Pre-training Transformer (GPT) and is trained on a massive amount of text data.

It has the potential to produce human-like text for various natural language processing tasks, such as language translation, question answering, and text summarization. The model is pre-trained on a vast amount of text data and then fine-tuned for specific tasks. This allows the model to understand the complexities of language and produce more natural and accurate text.

Moving into details, ChatGPT was launched by OpenAI in November 2022. OpenAI is a San Francisco-based AI and research company that has created many usable projects in the field of AI. This AI-based chatbot was developed to address some of the issues of traditional chatbots, such as limited understanding models and improvement capacity. ChatGPT auto-detects words and provides outputs based on the inputs given by users. The bot is easy-to-use and has already attracted over a million users.

It can be used for different purposes – all you have to do is ask!

ChatGPT is useful for a variety of purposes, including

  • Identifying keywords or topics for content.
  • Producing personalized communications, for example, email responses or product recommendations.
  • Creating marketing content such as blog posts and social media captions.
  • Translating texts from one language to another 
  • Summarizing long documents by providing a comprehensive overview of the full text
  • Automating customer service

How does ChatGPT work?

ChatGPT was fine-tuned using both Supervised Learning and Reinforcement Learning. The creators used Reinforcement Learning from Human Feedback (RLHF) technique to minimize harmful, untruthful, and biased outputs. The technique consists of three steps: supervised fine-tuning, the reward model and proximal policy optimization.

Let’s understand each step in detail.

Supervised fine-tuning 

In the first step, demonstration data is collected to train a supervised policy model or SFT model. This data is collected by having a group of human labelers. They provide expected output responses to a list of prompts. The resulting dataset is relatively small, but high quality and is used to fine-tune the pre-trained GPT-3.5 series model. However, due to the limited data, the SFT model may still generate text that is not user-friendly and misaligned. Thus, instead of creating a larger dataset through human labeling, reward models are created by ranking the outputs of the SFT model.

The reward model 

The purpose of the reward model is to give a score to the outputs of the SFT model, which indicates how desirable they are to humans. The process is based on the preferences and guidelines of the selected group of human labelers.

To achieve the reward model, a list of prompts is selected, with the SFT model generating multiple outputs for each prompt. The labelers then rank the outputs from best to worst to create a new labeled dataset. This dataset contains approximately 10 times more data than the curated dataset used by the SFT model. Once the new data is collected, it is used to train the reward model, which takes a few SFT model outputs as input and ranks them in order of preference.

Proximal policy optimization

In this step, Reinforcement learning is applied to fine-tune the SFT policy using Proximal Policy Optimization. The PPO model is initialized from the SFT model, while the reward model initializes the value function. The environment used in this is a bandit environment in which a random prompt is presented, and a response to the prompt is expected. Later on, it produces a reward based on the prompt and response.

Key components of ChatGPT

ChatGPT combines various components, including machine learning, natural language processing, and others. This is to understand and respond to users in a better, natural and human-like way. There are also several technologies involved to improve the interaction. Here we will learn about each component and technology of ChatGPT.

1. Machine learning: Machine learning is a branch of artificial intelligence that uses algorithms, features, and data sets that improve over time. With ML as an integral component, ChatGPT recognizes input patterns efficiently and responds to queries more accurately.

2. Natural language processing: NLP is a significant part of ChatGPT that focuses on converting unstructured data, such as text or speech, into a computer-readable format. NLP involves several steps, including input generation, analysis, dialog management, and reinforcement learning. These steps work together to understand human language and generate appropriate responses.

3. Data mining: Data mining is another important component that involves analyzing data using unsupervised learning. While machine learning focuses on making predictions based on current data, data mining is used to discover unknown attributes.

4. Intent analysis: Natural Language Understanding (NLU) is a set of techniques that allows ChatGPT to determine the correct intent (or topic) of a request and extract additional information that can be used to trigger additional actions, such as context, account preferences, and entity extraction.

5. Response generation: ChatGPT is the model for NLG that generates text using a convolutional neural network (CNN). Natural Language Generation (NLG), another element of NLP, allows the creation of text in a way that it resembles the appearance, emotion, and tone of natural speech.

Features of ChatGPT

ChatGPT is a highly popular AI chatbot with several key features that set it apart from other chatbots.

1. Text generation: ChatGPT can easily generate text responding to prompts, queries, or other input. It also generates text similar in style and content to the input it receives, making it an ideal choice for text-generation tasks.

2. Natural language processing: ChatGPT is trained on a large dataset of human-generated content, which allows it to understand and respond to natural language input. This makes it useful for answering questions and providing accurate information.

3. Contextual understanding: ChatGPT can understand the context of a conversation and generate appropriate responses. Users seeking answers to their questions are at a great advantage with this unique feature of ChatGPT.

4. Customization: ChatGPT can be customized to generate text in a specific style or tone by training it on a specific dataset. This makes it versatile and attracts more and more users.

5. Versatility: ChatGPT can be used for various applications, such as automated customer services, chatbots, language translation, etc.

6. Cost saving and multiple language support: ChatGPT helps reduce expenses and costly resources by efficiently handling a high volume of inquiries. Additionally, it can support multiple languages, making it valuable for businesses with a global audience.

How to build an app with ChatGPT

Let’s understand the process of creating an app using ChatGPT with an example.

Consider that we want to build a to-do list application using React Native. Now with the help of ChatGPT, we will start the development process.

Before you begin, register and log in to your ChatGPT account. Start the development process and input a query in ChatGPT, asking how to build a to-do list application using React Native. Based on the result, move step by step and ask the tool to write codes.

Here’s how we did it.

Input query: How to build a to-do list application using React Native?

Result we got: 

To build a to-do list application using React Native, you will first need to set up your development environment by installing the required tools such as Node.js, React Native CLI, and an Android or iOS emulator.

  1. Install Node.js:
  2. Install React Native CLI: npm install -g react-native-cli
  3. Create a new project: react-native init ToDoList
  4. Navigate to the project directory: cd ToDoList
  5. Start the emulator:
    • for Android: react-native run-android
    • for iOS: react-native run-ios
  6. Create a new component for the to-do list: touch src/components/ToDoList.js
  7. Open the newly created file and add the code for the to-do list component
  8. Import the ToDoList component in the App.js file and render it
  9. Run the application:
    • for Android: react-native run-android
    • for iOS: react-native run-ios

Input query: How to install Node.js for the application?

Result we got: 

To install Node.js on your machine, you can use the following command:

curl -sL | sudo -E bash -
sudo apt-get install -y nodejs

This command installs the latest version (14.x) of Node.js and its package manager, npm, on a Debian-based Linux distribution.
Alternatively, you can also download the installation package from the official website and run it:

If you’re using Windows or macOS, you can download the appropriate installer package from the website and run it to install Node.js.

Note that you may need to open terminal as administrator or use sudo in the command depending on your system setup

Input query: How to install React Native CLI

Result we got: 
To install the React Native CLI, you can use the following command:

npm install -g react-native-cli

This command installs the React Native CLI globally on your machine, allowing you to use the react-native command in the terminal to create and manage React Native projects.

Alternatively, you can also install it as a development dependency in your project:

npm install --save-dev react-native-cli

This will install the React Native CLI in the node_modules directory of your project, and you can use it by referencing the local installation path.

Note that you may need to open the terminal as administrator or use sudo in the command depending on your system setup

input Query: How to create a new React Native project using the React Native CLI

Result we got: 

To create a new React Native project using the React Native CLI, you can use the following command:

react-native init MyProject

This command creates a new directory called MyProject and sets up a basic React Native project structure within it. The directory will contain the necessary files and directories for a React Native application, including the index.js file that serves as the entry point for your application.

You can replace MyProject with the desired name for your project.

This command also sets up the basic structure for an application with the name MyProject. The structure will have index.js as the entry point for the application.

Alternatively, you can use the following command to create a new project by specifying the template.

npx react-native init MyProject --template react-native-template-typescript

This command will create a new project with the specified template, in this case it is react-native-template-typescript.

Please note that you may need to navigate to the directory where you want to create the project before running this command, and that you may need to open terminal as administrator or use sudo in the command depending on your system setup.

Input query: How to navigate to the project directory

Result we got: 

To navigate to the project directory, you can use the cd command in the terminal.

For example, if you have created a project called MyProject, you can navigate to the project directory by using the following command:

cd MyProject

This command will take you to the MyProject directory, where you can access the files and directories for your React Native project.

You can also use relative path to navigate to the project directory. For example, if you created the project in a directory called ReactNativeProjects:

cd ReactNativeProjects/MyProject

You can also use the absolute path to navigate to the project directory:

cd /path/to/MyProject

It’s important to make sure you are in the correct directory before running any commands related to the project, such as react-native run-android or react-native run-ios.

Input Query: How to start the emulator on android and IoS

Result we got: 

To start an emulator for your React Native project, you will need to have an Android or iOS emulator installed and configured on your machine.

  • For Android:
react-native run-android

This command will start the emulator and run the application on it. If the emulator is not running, it will start the emulator first before running the application.

  • For iOS:

Input Query: How to create new components for the to-do list

Result we got: 

To create a new component for the to-do list in your React Native project, you can use the following command:

touch src/components/ToDoList.js

This command creates a new file called ToDoList.js in the src/components directory of your project.

Alternatively, you can also create the file manually by using your file explorer, or by using the mkdir command to create the src/components directory and the touch command to create the ToDoList.js file.

mkdir -p src/components

touch src/components/ToDoList.js

Once the file is created, you can open it and start adding the code for your to-do list component. This component can be a class-based or functional component, it depends on your preference.

In this file you will define the structure and functionality of the to-do list component. This can include JSX for the layout, state for managing the list items, and event handlers for adding and removing items from the list.

Please note that the above command assumes that you have already navigate to the root of your project directory where the package.json file is located and that you may need to open terminal as administrator or use sudo in the command depending on your system setup.

Input Query: How to open a newly created file and add the code for the to-do list component

Result we got: 

You can open the newly created file ToDoList.js with any text editor and add the code for the to-do list component.

You can use the following command to open the file in the terminal using the nano editor:

nano src/components/ToDoList.js

You can also open the file using any text editor of your choice, such as Sublime Text, Visual Studio Code, or Atom.

Here is an example of how you can add code for a to-do list component in the ToDoList.js file:

import React, { useState } from 'react';
import { View, Text, Button, TextInput } from 'react-native';
const ToDoList = () => {
    const [tasks, setTasks] = useState([]); // state to hold the list of tasks
    const [newTask, setNewTask] = useState(''); // state to hold the value of new task input
    const addTask = () => {
        setTasks([...tasks, newTask]); // add new task to the list
        setNewTask(''); // clear the input field
    const removeTask = (index) => {
        setTasks(tasks.filter((task, i) => i !== index)); // remove task from the list
    return (
                New Task:




                {, index) => (


                        < button title="Remove"> removeTask(index)}  />

                    < /button>



export default ToDoList;

This code defines a functional component called ToDoList that renders a view with two children views. The first view is for inputting new task and adding it to the list and the second view is for displaying the list of tasks and removing them. The component uses TextInput from react-native, which is a built-in component for inputting text.

Please note that this is just an example and you may need to customize this code to fit your specific requirements. Also, you may need to import some react-native components that are not imported in the above code snippet.

Please also note that, you have to save the file before exiting the nano editor by pressing ctrl + o and then ctrl + x to exit the editor.

Input Query: How to import the todolist component in the App.js file and render it

Result we got: 

To import the ToDoList component in the App.js file and render it, you will need to add the following code:

import React from 'react';
import { View } from 'react-native';
import ToDoList from './src/components/ToDoList'; // import the ToDoList component
const App = () => {
    return (
        < View>
             // render the ToDoList component
        < /View>

export default App;
In this example, the App component is importing the ToDoList component and render it as a child of the View component.
Please note that the above code assumes that the App.js file is located in the root of your project directory and that the ToDoList.js file is located in the src/components directory. If the component is located in another directory, you should adjust the path accordingly.
Also, you may need to import other components or modules that are used in the ToDoList component but not imported in the above code snippet in App.js file.

Input Query: How to run the application

Result we got: 

To run the application in your React Native project, you can use the following commands:

For Android:

react-native run-android

This command will start the emulator and run the application on it. If the emulator is not running, it will start the emulator first before running the application.

For iOS:
react-native run-ios

This command will start the iOS simulator and run the application on it. If the simulator is not running, it will start the simulator first before running the application.

You should run this command from the root of your project directory, where the package.json file is located.

Please note that, you have to open the emulator or simulator and have the development server running in another terminal window before running this command. Also, you may need to open terminal as administrator or use sudo in the command depending on your system setup.

After running this command, the application will be built and deployed to the emulator or simulator. If everything is set up correctly, you should see the to-do list application running on the emulator or simulator.

In the same way, if you want to add more functionalities to your react-native application, style the view container, or change its background color, input a query in the ChatGPT asking for the code and steps.

You can build a fully functional react-native application by following all the commands, steps, and code the tool generates. If there is an error or bug in the code, the tool also helps fix the issues by providing example codes and suggesting ways to debug codes. Thus, many other usable applications can be built with the help of ChatGPT – all we have to do is ask questions.

Benefits of using ChatGPT for app development

In modern app development, artificial intelligence and AI-based development tools have become one of the key driving forces. These are becoming virtually endless, helping businesses achieve micro or macro goals efficiently and effectively – regardless of the industry type. ChatGPT for app development can greatly streamline the process while enhancing the in-app user experience. In light of this, let’s take a closer look at how this AI-based chatbot is changing app development.

Here’s what you need to know.

Writing codes 

App development often requires writing intricate and time-consuming code. However, with the help of ChatGPT, both professionals and beginners in app development can streamline their coding process.  Additionally, if developers encounter any issues with their code, they can use the tool to modify or fix them quickly. Furthermore, ChatGPT can be utilized to write code in any programming language.

Improved efficiency 

ChatGPT can provide significant benefits for app development companies by streamlining various tasks and processes, providing quick solutions, and allowing developers to focus on more critical responsibilities. This can lead to an increase in efficiency and productivity, resulting in businesses saving time and being able to focus on growth opportunities. This tool can be a powerful asset for companies looking to optimize their operations and drive success.

Debugging codes

As a programmer, you can leverage ChatGPT’s capabilities to your advantage by utilizing it to identify and troubleshoot errors in your code. By requesting ChatGPT to review a piece of code for mistakes, it will not only point out the issues but also provide suggestions on how to fix them, including specific examples.

ChatGPT’s code generation capabilities ensure that the resulting code is:

  • Error-free and bug-free
  • Clearly and thoroughly documented
  • Simple to comprehend and maintain
  • Tailored to meet specific business requirements
  • Built to perform well in the production environment


By following the steps outlined, ChatGPT can be utilized to develop a fully functional and robust app. Its advanced and intelligent capabilities are poised to significantly impact various industries, including the business world and daily life. Its potential to enhance search engines, improve user service, and generate written content more sophisticatedly is expected to drive innovation and automation of routine tasks and non-creative functions.

The use of ChatGPT in various industries is expected to bring significant benefits, as businesses will be able to optimize different business processes through it. AI-based systems, such as ChatGPT, are expected to revolutionize human and machine interactions. Businesses can continue to grow by staying informed and utilizing these artificial intelligence-based systems.

If you want to integrate ChatGPT model-powered solutions into your business, contact LeewayHertz’s ChatGPT developers.

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Author’s Bio


Akash Takyar

Akash Takyar
CEO LeewayHertz
Akash Takyar is the founder and CEO at LeewayHertz. The experience of building over 100+ platforms for startups and enterprises allows Akash to rapidly architect and design solutions that are scalable and beautiful.
Akash's ability to build enterprise-grade technology solutions has attracted over 30 Fortune 500 companies, including Siemens, 3M, P&G and Hershey’s.
Akash is an early adopter of new technology, a passionate technology enthusiast, and an investor in AI and IoT startups.

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