I Built an Entire App with OpenAI's Codex and 8 AI Agent Employees

Greg Isenberg
52 min
1 views

📋 Video Summary

🎯 Overview

This video demonstrates how to build a complete app from scratch using OpenAI's Codex, along with AI agents for various tasks. The creator walks through the process of generating an idea, developing a product requirements document (PRD), coding the app, and creating a marketing plan, all with the help of AI tools.

📌 Main Topic

Building an app from idea to launch using AI tools and AI agent employees.

🔑 Key Points

  • 1. Finding an Idea with Idea Browser [0:21]
- The video starts by using Idea Browser to find a business idea based on market trends and insights from social media.

- Key is finding a growing market with low competition and personal interest.

  • 2. Using ChatGPT to Generate App Ideas [0:58]
- A prompt in ChatGPT is used to generate app ideas based on the trend found in Idea Browser.

- The prompt generates multiple app ideas, each with a name, concept summary, core features, and market analysis.

  • 3. Refining the Idea and Creating a PRD [8:19]
- The creator combines and refines the generated ideas in ChatGPT to create a more specific app concept.

- The refined idea is then turned into a Product Requirements Document (PRD) using ChatGPT.

  • 4. Building the MVP with Codeex [16:00]
- The PRD is used to instruct Codeex, a Visual Studio Code plugin, to build the Minimum Viable Product (MVP) of the app using Next.js and Superbase.

- Codeex allows for local and cloud-based AI agent work, enabling asynchronous task handling.

  • 5. Leveraging Cloud Agents for Marketing and More [23:41]
- While the local agent builds the app, cloud agents are used to create a marketing plan, roadmap, and other tasks simultaneously.

- This highlights the power of using multiple AI agents for productivity.

  • 6. Testing and Debugging [27:30]
- The creator runs and tests the MVP, debugging and fixing any errors.

- Demonstrates a straightforward debugging approach: copy, paste, and let the AI fix it.

  • 7. Generating Additional Features and Researching with Idea Browser [36:39]
- The creator adds a new feature (AI chat interface) and utilizes the Idea Browser's research capabilities to improve the app.

- Emphasizes the importance of continuous improvement and iteration.

  • 8. Marketing and User Acquisition [46:13]
- The creator shares strategies for getting users, primarily through organic marketing on platforms like X (formerly Twitter).

- Emphasizes building an audience and beta testing as key steps.

💡 Important Insights

  • Focus on Problems and Solutions: The best products solve problems that the builder personally understands. [4:24]
  • Iterate and Build: The key to success is to build something and learn from it, pivoting as needed. [12:18]
  • Leverage AI Agents: Treat AI as employees to handle various tasks, increasing overall productivity. [24:24]
  • Prioritize Organic Marketing: Utilize platforms like Twitter to build a user base and gather feedback. [46:22]

📖 Notable Examples & Stories

  • Twitter's Origin: The story of Twitter's evolution from a different initial concept. [13:04]
  • Instagram's Origin: The story of Instagram's evolution from a different initial concept. [13:30]
  • Creator Buddy Launch: The creator built a social media app based on his own needs and used a simple tweet to kickstart the beta process, gathering 200,000 impressions. [47:09]

🎓 Key Takeaways

  • 1. Use AI tools to accelerate the app development process from idea generation to launch.
  • 2. Embrace an "AI employee" mindset, utilizing multiple agents for simultaneous tasks.
  • 3. Focus on building and iterating, using organic marketing to acquire users and gather feedback.

✅ Action Items (if applicable)

□ Explore Idea Browser and ChatGPT for generating app ideas. □ Experiment with Codeex to build a simple app. □ Create a marketing plan for your idea using AI tools. □ Start building your audience on social media.

🔍 Conclusion

This video provides a comprehensive guide to building an app using AI, emphasizing the power of combining tools like Idea Browser, ChatGPT, and Codeex. The creator shares a practical workflow and valuable insights, encouraging viewers to take action and build their own projects.

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Created Jan 10, 2026

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