Source: http://www.engadget.com/2013/10/31/google-fonts-now-lets-you-experiment-with-typefaces-in-free-app/
Google has a lot of free fonts on offer, but it's hard to know how they'll look on a website without putting them into HTML code or buying a preview tool. It's now much easier to experiment with typefaces, however, as Google Fonts has just integrated a typography app. Designers can click a link to test a given font in a free, lightweight version of Monotype's Typecast; from there, they can try out new color combos, effects, sizes and weights. Those happy with their work can export code and save images, and they can subscribe to Typecast's $29 per month premium service if they need to create style guides or offer live web previews. Page creators only need to visit Google Fonts to start tinkering with their text.