I like the original design too. I wonder how many fonts you want to include in the final app?
im not sure who would use this. Categories like school, letter and invitation are mostly for people not using fonts for commercial or professional. while logo, website, book etc. are for professionals working as designer or something.
i would only include categories for "non professional use" and fonts that come with windows and office.
Because theres too much information you need for professional use. Lets say im looking for a font for a book. But what i really do is looking for a font family to use. I need to know if it has a italic style, ligatures, contextual alternatives, the licensing, the price...