Codex: Master Programming

CodiBrain

Contains adsIn-app purchases

About this app

Codex is the fun, free way to master Python, Java, SQL, and HTML/CSS through bite-sized lessons. Whether you want to build cool projects or become a job-ready developer, our built-in Code Editor lets you write real code directly on your phone.

Designed by experts, Codex takes you from "Hello World" to building your own software. Join a growing community mastering coding, programming logic, and software development one logic puzzle at a time.

Why Codex?

- Bite-Sized Lessons: Quick, structured steps that make learning easy.

- Write Real Code: Use the mobile Code Editor to practice as you learn.

- Essential Languages: Master Python, Java, SQL, and HTML/CSS.

- Flexible Goals: Perfect for hobbyists, students, or future developers.

- Career Ready: Build the programming logic needed to land a developer job.

Ratings and reviews

For some reason in the free version it repeats the same lesson and lets you "pass" different lessons that are just the same one, then the next day will actually be the lesson you left off on. If you pass levels like I did to see if it would actually change, the next day will start on the last level marked as pass and repeat for all other levels until the next day.

Fine for free but wouldn't spend money on such a limited app. Seems ok but the app has no way to report an issue with specific lessons. The app needs more functionality and a way to report issues with lessons. I am stuck on a python lesson and cannot get past because the lesson expects me to put in 2 lines of code but there is no way to return to a new line.

I really wanted Codex to work well, but honestly, the experience has been pretty inconsistent. Sometimes it does exactly what you expect and even gives surprisingly good code. But a lot of the time, even when I give clear and correct logic, it still messes things up. Either the output is wrong, incomplete, or it introduces bugs that weren’t even there before. What frustrates me the most is that simple tasks get overcomplicated for no reason. And when you try to fix something, it doesn’t always..

What’s new

Some fixes