Codinguru is an Android app that allows you to test your knowledge of various programming languages. The app contains over 1000 questions from more than 10 different languages, including Python, Android, C++, C#, Kotlin, JavaScript, PHP, Java, Ruby, HTML, and Swift.

In addition to testing your knowledge, you can check the popularity of programming languages in the Codinguru programming index. If you find an error, you can easily submit it with a simple form. The app is completely free and does not require any specific permissions. However, if you want additional functionality, you can upgrade to the Pro version.

Overall, Codinguru is a useful tool for anyone looking to improve their programming skills and test their knowledge. Don't forget to leave a review and share your experience with others.