Why did these kids succeed? The answer is, quite possibly, that they deserved to! Go to their website and take a look at the <i>supported use case</i> for their app. Their app appeals to both the <i>browser and collector mindset</i>. Already, they are harnessing powerful psychology. On top of that, if their "perfect formatting" claim for article, then they also are presenting a polished UX.<p>I tried out two different Wikipedia apps for my old Windows XP Tablet machine. If you're technically inclined, you can load a compressed snapshot of Wikipedia and carry it with you. That puts you in the position of "administrator and custodian" of your Wikipedia snapshot, which isn't fun and seems like work, whereas being a browser and collector is an addictive sort of hobby.<p>You can think of this as Instapaper for Wikipedia.