I am still unable to point you to an app which uses tech from Spritz to increase your reading speed, but I can show you the new demo that Spritz developed in partnership with the ebook subscription service Oyster.
Spritz and Oyster have taken the first part of The 7 Habits of Highly Effective People and wrapped it in a web-based app, enabling you to read it at speeds between 250 and 600 words per minute. You can find the demo here.
Spritz's technology is based on rapid serial visual presentation, a speed reading technique first identified in the 1970s. RSVP is a way of flashing a single word at a time in front of a reader, and it looks kinda like this:
This trick has been implemented any number of times over the past 40 years, and past studies have shown that it's not without its problems. For example, a reader's ability to retain and comprehend what they're reading drops as their reading speed increases, and it is also easy for readers to miss vital information.
Spritz has not released an app of their own, but they have generated enough interest to secure $3.5 Million in funding last month. The Spritz tech is available for license to app developers as an API, and the company has patents pending.