Differences in mobile app and browser.
I was switching back and forth between the browser and mobile app version and noticed that the Notes on each lesson do not show up on the browser version. Also on the mobile app, it doesn't give you the Key (fast-track) option. Am I missing something? I prefer working on the browser, but the notes are super useful.
Yeah, Duolingo in Windows Store (I'm using WIndows 10) has a different version and even when I get my daily exp, the desktop version ask me to complete another daily exp hahahaha
Key option exists in the mobile version, indeed. But there are major differences between the browser and the mobile app versions. For instance, there is no "clubs" section in browser version and no "discussions" section for the mobile app. That is, you do not miss something. Like la_ricfoi says, no idea about the reason lies behind this.