wfs subsets web fonts. It is similar to glyphhanger, except:

Features:

- written in Python, not Node
- automatically compares before and after screenshots
- supports automatic parallelism

Anti-features:

- uses Selenium instead of Puppeteer
- no JSDOM support, mainly because getComputedStyle is very buggy

Non-features:

- no spidering support: there are many excellent spiders, use those and then
  pass the URLs