# Introduction
The OpenAI Codex is one of the most useful tools for building software with AI. Instead of just requesting code, you can use it to edit features, edit files, fix bugs, connect tools, and quickly turn ideas into working projects. If you are new to Codex, start with this tutorial first: OpenAI Codex Full Tutorial 2026 | Using Codex from Scratch. It shows how Codex works in a real project from start to finish. You'll see how to provide instructions, develop an app step-by-step, and use Codex as your coding partner. Once you know the basics, these five project studies they are a great way to see what you can build with the Codex.
# 1. Building Your First Plan in Minutes
This tutorial is the best one to start with. It shows how to build a simple application step by step using Codex. The focus is on finding something that worked quickly without much difficulty. You can use this video to understand the basic workflow: define what you want, let Codex generate or modify the code, review the output, test the application, and continue to improve it using trace commands.
# 2. Building a Mobile App with OpenAI Codex
This tutorial is useful if you want to see Codex used for application development rather than a basic web application. The video covers building a Swift iOS app with Codex, using tools like this one Xcode and the Codex desktop application. The project is very exciting because the app itself is designed around a conversational “vibe coding” experience, where users can generate and manage apps in natural language. For starters, the main takeaway is how Codex can support complex workflows involving mobile interfaces, app design, local tools, and iterative feature creation.
# 3. Building an AI Startup in Just One Week
This video is about taking Codex from a simple idea to a full product like a startup in 7 days. They start with a simple idea and use Codex to turn it into a working web application step by step. Along the way, they build core features, fix problems, and continue to improve the product. The focus is on how Codex can help speed up the entire process of building an app from idea to something usable.
# 4. Vibe Coding A Complete 2D Beat 'Em Up Game From The Beginning
This is the most played project on the list. The tutorial shows you how to build a complete 2D beat 'em up game from scratch using the Codex, Phaserand image production tools. It's a great example of how Codex can be used outside of standard productivity apps and dashboards. You see how AI can help with game mechanics, characters, movement, visuals, and the overall structure of a browser-based game. For beginners, this project is useful because it makes coding sound more creative. You can check out the content, change the game style, add new characters, and see how the Codex handles interactive features.
# 5. Building a Full Stake Airbnb Clone
This is one of the most complete project studies on the list. It includes building a full Airbnb-style stack using Codex, Expo, We share Mdabu, The stripeagain Supabase. The app serves as a simple vacation rental platform where users can browse properties, view details, and go through the basic booking flow. The main idea is to show how Codex can help build a full-stack application step by step, including mobile screens, backend data, authentication or database workflow, and payments.
# Wrapping up
These projects show how flexible the OpenAI Codex can be. You can use it to build a simple startup app, a mobile app, a prototype, a full-stack clone, or a 2D game. The best way to learn is to start small, test often, and treat the Codex as a coding partner who still needs clear instructions and human review.
Kanwal Mehreen is a machine learning engineer and technical writer with a deep passion for data science and the intersection of AI and medicine. He co-authored the ebook “Increasing Productivity with ChatGPT”. As a Google Generation Scholar 2022 for APAC, he strives for diversity and academic excellence. He has also been recognized as a Teradata Diversity in Tech Scholar, a Mitacs Globalink Research Scholar, and a Harvard WeCode Scholar. Kanwal is a passionate advocate for change, having founded FEMCodes to empower women in STEM fields.
