It used to be this great app for practice. Now the app that aims to teach coding is ironically full of bugs both on the app and the web version. "Oops, something went wrong" pops up all the time on the app, while the web version requires you to subscribe to the premium version for the simple feature of a code editor. Seems like a dirty trick to lure some to try premium version by a made-up bug instead of being honest with the users. Anyway, I'm not taking back my review, unless they fix it.