Cheat Sheet about readability

This site is a reply to

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Readability describes, how easy text can be understood.

There are some numbers which help assess it:

• Simple words and sentences are easier to get than longer paragraphs
• Difficulty level (e.g. Flesh-Kincaid index or Gunning fox)
• Line length
• Kerning
• Tracking
• Alignment
• Leading
• Hierarchy
• Contrast

I'll explain the typographic terms above in another place and a link to it.