The app url is http://www.previouslook.com. The app makes it easy to look back at the snapshots of popular web pages over time.
It is inspired by Reddit Snapshot and Hacker Slide. When I saw those, I thought they are very cool in presenting time-based data. I wish they can do more. They would help a lot for the newest submission section of HN or Reddit by making it easy to quickly browse the content over time. Since there's an November App event, I decided to do a generalized version in November that can snapshot different websites and different pages.
Some sample HN pages: http://www.previouslook.com/hnews, http://www.previouslook.com/hnews/new, http://www.previouslook.com/hnews/ask
by Andrey
Azimov