[Andrew_nenakhov]

Hearts is the worst thing about Duolingo. They themselves claim 'it is ok to make mistakes', and then punish you for them, making you do useless (for learning) repetitive tests over and over again.

Luckily, there is still a classroom loophole that allows you to study with unlimited hearts, but I don't know how long it'll last

[aiven]

In the app you can use free practice mode to restore hearts.

[hombre_fatal]

The problem is that you’re grinding something you already know (in my experience always something too easy) just for hearts, and the heart system removes the ability to grind something you don’t know until you know it in a lesson. I want to make mistakes until I nail it when I’m learning.

That said, at least the Pro version fixes it.

[Andrew_nenakhov]

Thank you Captain Obvious. It is still useless grinding that takes time and gives nothing to learning.

Oh, and you start being afraid to make mistakes, to not be forced to perform said grinding over and over again.

I have 800+ days in Duolingo. There were no hearts when i started, it appeared when i was in early 700s and I learned how to switch them off with classroom trick. If I had hearts from the start, I'd choose a different app. Hearts are that bad.