FontBook™ from Fontshop gives you the possibility to look for font designers, classes, foundries, usages or year the font was made. While they have agreat collection of fonts, you find nearly everything you are looking for as a designer or typographer. As of version 2.0, the app also features specially curated Font Lists which help you to search for fonts by practical and stylistic criteria, for example by use-case, genre, stylistic period, similarity or popularity. The new Version 3.0 has a universal font lexicon and runs also on iPod touch. The main intention of the app is learning to difference fonts and their derivation or simply to browse and play.