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The easiest thing to do, without creating a full-blown app, would be to make a mobile friendly/responsive design. So like, mobile.hubski.com or something. This would at least work around the fact that there's no API. I would point out though, that a mobile version of the site, whether an app or not, will most likely open this up to a different demographic (teens) which, based on other conversation I've read here, may not be desired.