Letrs is described as 'typeface manager in the cloud. Keep you font collection organised and sorted with this useful tool' and is an app in the OS & Utilities category. There are more than 10 alternatives to Letrs for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is NexusFont, which is free. Other great apps like Letrs are FontBase (Freemium), Font Manager (Free, Open Source), Typeface 2 (Paid) and FontExpert (Paid).
Font Book is the standard font manager that comes with Mac OS. The program enables users to: Preview and install font files, avoiding multiple instances of the same font. Review installed fonts using various sample texts and sizes.
myFontbook is a free and easy way to browse your font collection. The font viewer allows you to easily review and catalog all of your installed fonts. Compare all of your installed fonts with an easy to use font viewer.