Edit- Apparently Lingodeer retroactively locked most everything behind a paywall, so I removed my comments regarding that. However, my opinions for the other aspects still stand. To add, it seems the “Japanese Pass” and “Multilingual Pass” (which unlocks all languages) are the exact same price, for what it’s worth. I can attest that if the pricing ever changes, though, you’ll maintain your access. I still have access to the (much wider now than when I paid) catalogue, and have never paid beyond my original $20.
Pretty sure Lingodeer is (mostly) free, and even if not I wouldn’t touch Duolingo Japanese with a 39 and a half foot pole after having looked at it now that my Japanese is at a higher level. Every single time I open Duolingo and do a lesson/review, I inevitably spend more time reporting mistakes than anything else.
I bought into Lingodeer way back when they first introduced the subscriptions, so I got lifetime for something like $20 and haven’t looked at the conditions since. That’s my disclaimer for my upcoming comment.
If it still functions as it used to (and as it does with English for Japanese speakers, which I only know from testing it before suggesting it to students), the entire “Unit 1” (the part which roughly covers Genki I/N5) of Japanese should be free to use… It isn’t pay-to-use until Unit 2 (i.e. roughly Genki II/N4). On top of that, the lifetime payment isn’t only one language, but for Lingodeer in it’s entirety. That is, you get lifetime access to Lingodeer’s content for every language they offer.
Now let’s assume that I’m entirely wrong (I very well may be. Again, I haven’t looked at the ToS etc. in a long time). The difference between Duolingo and Lingodeer is similar to the difference in free food and an expensive meal. One you probably got off an expired meat truck from Wal-Mart, the other is from a 5-star steakhouse. You do the math on if that’s worth it (though yes, I do understand worth and affordability are entirely separate).
Edit 2- To add, I should give Duolingo credit where credit is due. The fact that they do what they do with volunteers and for free is pretty amazing, and their review system is certainly something worthy of praise. Lingodeer could learn a thing or two from that system.