I am very much team Lingodeer. Currently using it for Korean and I find it much more extensive than Duolingo.
Which Duolingo’s marketing is to be commended for it\s incredible growth, I feel in terms of genuine learning experience, they aren’t even close to Lingodeer.
I enjoyed Lingodeer when I started with Korean. It felt like a digital textbook with exercises and great explanations of grammar. However, once you get to an A2 level, apps like those don’t help as much as other learning methods, such as finding reading material, speaking time, and intensive listening.