This is a fairly old and relatively stagnant app from 2016 that was recently added to the Mac App Store with added support for Dark Mode. It only supports TTF and WOFF font formats. I've verified that it cannot work with TTC or OTF fonts. It runs fine on macOS 10.14.6. It has some nice uses as a method for exporting font glyphs singly or in batches as PNG, SVG and PDF formats in any size and color. This is of interest to those creating web pages without having to worry about coding in actual web fonts. Note that you can do the same thing using most imaging apps, such as GraphicConverter. Therefore, it may be redundant to software you already have. But it's free. - - What it very much needs is an update to support all modern font formats. Otherwise, it's considerably hobbled. Therefore, I can't give it more than two stars.