Hey! Xefjord here, I help run the Lingodeer subreddit and discord server. If anyone has any questions about Lingodeer feel free to ask me. I will try to address as much as I can.
If you encounter mismatches between the language you hear and the language you are reading then at the end of each exercise when it shows the mascot on a red or green banner? At the top right of that banner is a little paper airplane, you can tap that and send a report to Lingodeer to have the issue fixed. Also remember that for Korean specifically, they have some pronunciation exceptions in specific cases where the letters are not pronounced the same way you would expect when ordered in a certain way. So be conscious of those as well. If you have any general issues or can’t find the paper airplane, you can just send an email to firstname.lastname@example.org.
Now let me clarify that I am a volunteer and that I don’t work for Lingodeer and don’t get paid by them, so this next part is entirely my opinion and from my experience
I used to be a HUGE fan of Duolingo’s teaching style and have advocated Duolingo for years. But the languages I am passionate about and interested in learning have always been the East Asian Languages (Chinese, Japanese, Korean, and Vietnamese). I cohost the 1500+ member Unofficial Duolingo Discord Server and was thrilled when they announced they would be adding East Asian languages. Well when the courses first came out, I wasn’t incredibly impressed, but i still recognized the potential of the Duolingo platform and tried to defend the new courses regardless of the criticism. But I was admittedly a bit disappointed myself. Duolingo has a very bad track record of communication with the community as well which made it even more disheartening when I felt like they were making poor decisions (Like trying to make a Japanese course without grammar notes)
Then Lingodeer came out. Lingodeer IS similar to Duolingo and has a lot of the pro’s that Duolingo offers, but they worked hard to adapt the system for Asian languages and to fix a lot of the flaws in Duolingo’s system. Offering in-app grammar notes, flashcard reviews, dedicated lessons towards teaching the sound systems and writing, and now it even offers stories to read to help close the gap between the App and traditional textbooks. Most importantly, the company is AMAZING when it comes to actually listening to users and implementing feedback. They respond to most reviews personally and seriously consider every suggestion tossed their way. This alone adds on so much more potential that Duolingo just doesn’t have anymore because they are averse to change and listening to their users. (Although they have slowly gotten better, I think most Asian language learners have already bailed ship to Lingodeer).
I have gone about halfway through the Duolingo Japanese course, and I have also completely finished the textbook Genki 1 for Japanese. Lingodeer currently teaches about all of Genki 1 in material and has a “Coming Soon” at the end of their tree to signal that they may even extend their existing trees and add significantly more than what they offer right now. Vietnamese has been confirmed to be on the way for Lingodeer and may be added any day now (It was slated for Spring 2018). They are constantly working to improve the app, etc. The TTS for Duolingo sucks and traditional textbooks like Genki don’t even have a whole lot of audio available. Meanwhile Lingodeer has full native audio and also has full grammar explanations for a wide variety of grammar points all the way up to the very last skill in each tree. So they will not skimp you on grammar at all. Please give Lingodeer a fair shot and if you have any feedback; negative, positive, suggestions, etc. Shoot it our way. Thanks!