The Cantonese PinYin will win you a lot of customers, right now in the market there is really only 1 Cantonese keyboard and it has over 50,000+ download with 1400+ reviews. I currently am stuck using it when I need to type Chinese and change back to Smart Keyboard to type in English. Its a big market and we are all just stuck using the Cantonese keyboard because there isn't any other real choices (the other 2 are so bad its not worth mentioning). The Cantonese keyboard app is pretty decent at typing Chinese words but is totally useless at English (no spell check, no dictionary, no function at all). A lot of other chinese users won't use the Smart Keyboard unless you have handwriting option (that's why you see almost 80%+ of the Chinese keyboard will include handwriting)
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