ok thank you. that actually explains a lot.
Yes i use an 'unofficial' version of android. the MIUI android system, however it seems to be official enough as there is a huge amount of support for it, and it can still download all the apps from google play, as well as all of the chinese ones of course.
But you say you've already got English audio on iOS? Ok i will have to check that out.
I think the ability to add your own audio would be good, or at least as a stepping stone waiting from the official audio flash cards.
I also think you are in a nice position, because you already have a well established foreign user base, of which usually works with a fair amount of chinese who are constantly impressed by the offline functionality of PLECO. and considering the options that they have, and i've check out a few of them.. even ones with some sort of flashcard ability. ..... 百词斩(maybe is the best here), 单词锁屏, even 有道, they mainly offer online capabilities, which of course makes it difficult to find out words easily.
Other programs like duolingo, memrise also offer language & flash card services but you have to submit to their learning style... which often you don't want to do.
and ankidroid- while amazing for what you can put on it, (for instance put a whole tv show on it- and convert the audio & subtitles into flash cards) it requires a learning curve just to use it.
People mainly want to use a functional, reliable system... and i think that;s exactly what you've got. I think your updated product will be very well received in the chinese market.
Please keep up the good work. Looking forward to the future updates... especially on the 'non-official' versions of android