Last night, after I posted a screenshot of Groupon’s stock price from my iPad, some people asked me which app I was using. It’s actually my favorite iOS app, StockTouch.
After I wake up every morning, I grab my iPad and open StockTouch. The first screen I see is an overview of the top 900 US stocks by market cap, split by sector:
This is an incredibly powerful data visualization; it gives an at-a-glance view of the entire market’s health. It also facilitates quick exploration. Touching a sector zooms in to just those companies:
And touching a stock zooms in to the company overview:
The UI is gesture-based, so it’s easy to quickly pan around and get a feel for what is going on with the market at any given interval. You can also change the ordering of the companies in each sector box (I sort by market cap, but you can also sort by percentage change or by...