UPDATED: December 19, 2012
We announced today that FontBook has been enhanced as a universal app and will work on iPhone as well as iPad. We’re sure you’ve got lots of questions. We’ll answer some of your burning ones below, but feel free to leave more in the comments.
If I purchase the app, can I use it on both my iPhone and iPad?
Yes, as a universal app, you pay once and you may install it on any of your iOS devices. FontBook runs on iPad 2 (and later), iPad Mini, iPhone 4 (and later) and iPod touch (4th gen. and later)

Is there an Android version of the FontBook?
Not currently. While we are watching the growth of the Android market, we would first like to experience the transition from print to digital FontBook on one platform.
But what about print?
We want to deliver more information than ever before with the new typeface compendium. Note that the App delivers 620,000 font specimens — 19 times more than the printed FontBook 4. With FontBook 4, in 2006, we had to make compromises to host all available typefaces in one volume. For example, we downsized the showing of FF Meta (26 fonts) from three pages in 1998′s FontBook 3 to one page, despite the fact that the family had grown to 300 weights in the meantime. We did that by squeezing the stylistic sets into four lines of sample text — not a very user-friendly compromise. FF Meta is now shown in its entirety. The app also allows you to combine and compare type specimens — completely impossible with previous editions unless you were willing to tear your book apart.
Can I download fonts on my device?
iOS does not support the installation of fonts by the user. However you can download font files that have been purchased on FontShop with mobile Safari once you log into your account from a desktop computer.
Does FontBook contain the actual files of the shown fonts?
No. The FontBook app delivers raster images of typefaces that are generated and stored on a server. FontBook is an online Browser.
Can I use the FontBook app without an internet connection?
The app is primarily an online browsing application and can only display its full content when your device has live internet access through a WiFi/WLAN or 3G mobile connection. However, if you have no online access, you can temporarily switch the “Include online content” setting to “off”. This will enable the app to display a reduced pool of selected content which will work offline. Whenever you do have online access, you can switch back to the full version by switching the “Include online content” setting to “on”.

FontBook is available in the App Store. Learn more at fontbook.com.