Hacker News Reader

It claims Chinese/Japanese/Korean is unsupported, but works fine for me:

Is that the only character you tried? Try writing "論" and see what happens..

I tried 四 and it didn't work. I guess Hiragana and Katakana work, but not Hanzi/Kanji/Hanja.

Right. Hiragana and Katakana ist trivial (just a couple of characters), but no support for Kanjis currently