Why is KanjiLearn limited to the first 2135 kanji only?
Because when you know these 2135, you are theoritically all set for reading Japanese. However, for the Kanji Proficiency Test for example, you need a lot more (level 1 needs 6000 kanji). Kanji after 2135 are not in KanjiLearn only because of data size. If many people are interested, I could add them.