In order to learn vocabulary for Chinese, when seeing the words colored by pinyin level i could check myself on giving them more learning importance, that also would be very convenient in order to see the complexity of the dialogs
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This is also exactly what I was looking for. I guess it should not be too hard as there are complete lists for each level.
That might also be useful for the Japanese JLPT levels (I think they have lists for the vocab for each level) and other standardized language tests which have fixed vocabulary lists.