Hello,
With a smart phone, one has to scroll all the way down to check on the pronunciation of a complex word.
And then scroll up back to Mandarin and so on...How inconvenient!
It is surely better to have a line-by-line Mandarin-Pinyin for intermediate & advanced learners.
Best regards
P.S.
-Please, some learners are using Windows10 smart phones.
-Chineseclass101 is a great great experience