[d5tryr]

It's extremely pretty, though I question some of the UX desicisions.  

Double-tapping an item makes it vanish. Due to the seemingly random selection of nodes that appear when re-searching for a parent node, that item may never be seen again...

Seems odd that a gesture like double-tapping, while not often used in iOS, would result in the exact opposite action of the familiar double-clicking to drill down or expand of other UIs.

[andymangold]

Thanks for taking the time to leave some thoughtful feedback.

To pull back the curtain a bit, you are right that the nodes that show up when a parent node is tapped are randomized. As you can imagine, many Wikipedia pages have thousands of links which would be unwieldy for both the hardware and the user. For this reason, we gave up on the idea that users would be able to search for a specific page through the node view. Our hope is that someone who is looking for a specific page will use the search feature, while the node-view will be used for more serendipitous browsing.

As far as the double-tapping is concerned, you may be right about it not being intuitive. It will be interesting to see what people's reactions are. We decided to go with it because, like you mentioned, it is one of lesser used gestures in iOS, and deleting a node is the least important way to interact with it. We felt that expanding and bringing up the article itself were more important, so we tied them to the more standard gestures.

[bryanjclark]

I also found the double-tap-to-delete counterintuitive. If a single tap expands a node, then a double-tap should open the article. Tap-and-hold to delete is a bit more intuitive, too -- it's the same gesture you'd use on your iOS home screen to delete an app.

That said, this is a beautiful app!

[SoftwareMaven]

Why not let the user "flick" it off the screen? That sounds more fun (and probably intuitive), anyway.