Step-by-step PDF
Concise instructions you can keep open and follow as you build.
Beginner-friendly guide
Build your first app from your phone
Follow a practical, step-by-step process to use Codex, create a working web app, test it from your phone, and publish a link you can share.
Instant access$2
Secure one-time payment with Stripe.
Your first web app
Idea → build → test → share A simple working web application you can open and share from your phone.Inside the guide
A clear path from blank screen to live link
Keep the PDF open on your phone while you work through each step. The guide focuses on the essential decisions and actions a first-time builder needs.
Mainstreet AI
Build Your First App From Your Phone
- Choose one small idea
- Build with Codex
- Test the result
- Publish and share
Companion walkthrough
Watch the complete process
The PDF is ready now. The companion video will be added here and to the buyer access page when it is ready.
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Companion video
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What you’ll get
A short, practical path from idea to link
Companion video
A concise walkthrough of the complete beginner-friendly process, added to the same access page.
A working web app
Finish with an app you can test, open, and share through a live link.
What you’ll build
A simple app that works on the web
You’ll create a small web application using Codex, test it from your phone, and publish it at a shareable URL.
This guide is a practical introduction, not a desktop IDE replacement or a native App Store app course.
Ready to build something you can share?
Get the practical PDF now, with the companion video added to the same guide.
Secure one-time payment with Stripe.