Ten languages. Daily practice. Sharpen your skills in Swift, Python, Rust, Go, and more with hands-on challenges from fundamentals to concurrency.
Codable turns programming practice into a habit. Solve focused challenges in ten languages — from your first data structure to lock-free concurrency — and build real fluency one problem at a time.
WRITE REAL CODE IN 10 LANGUAGES
C, C++, C#, Go, Java, JavaScript, Python, Rust, Swift, and TypeScript. Switch languages anytime — solve the same challenge in Python today and Rust tomorrow.
GO DEEPER THAN SYNTAX
Challenges span the topics that actually make you a better engineer:
• Fundamentals and string manipulation
• Data structures and algorithms
• Recursion and functional programming
• Object-oriented design and generics
• Error handling, concurrency, and memory management
BUILT FOR EVERY STAGE
New to programming? Start with fundamentals and level up steadily. Experienced? Jump straight into concurrency, memory management, and the problems that show up in technical interviews.
PRACTICE THAT STICKS
Short, focused challenges designed to fit into a daily routine — because fluency comes from reps, not marathons.
Download Codable and start mastering your chosen language!
This is a nice little on-device training app for programmers! I like that the UI is easy and straightforward, and that you get up to 3 free challenges a day, delivered in nice little bite-sized pieces.It even has a history section so you can go back and look at your previous attempts.I’ll be using this daily to brush up on my data structures, algos, concurrency usage, and more. Thank you dev!
Awesome Code Learning Tool!
VulcanCC
I use this to get better at Swift! What is nice is you can customize what kind of code challenge it will give you. I also like how you can copy the code challenge over into Xcode and come up with your solution. If your solution is wrong it will give you its solution. Not all solutions are the same. I use it on Mac along with Xcode. I highly recommend upgrading to Pro as you get unlimited tries per day! Check it out, you will love and best of all, you will LEARN!
This update contains bug fixes and performance improvements.
Version 2026.7
The developer, Intrepid Reality, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
