The kPinyin is a Keyboard Extension, designed for the user who needs to enter pinyin with phonetic notation in word, PPT, notes and other text apps on iPhone or iPad.
For example :
gōng yù shàn qí shì，bì xiān lì qí qì。
(工欲善其事，必先利其器。)
This keyboard does not require network access.
Tips:
If you could not find kChem when tap globe key : Remove kChem in the system settings, re-add it.