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Iosevka is very clear and legible on all displays and in all sizes.
Pro Great customizability
There is full customization of styles and variants in Iosevka.
Pro Large number of weights
This font comes in seven different weights, ranging from thin and extra-light to heavy.
Pro Several styles available
Many of the common styles are available, including Sans Serif and Slab Serif with normal, bold, italic, and bold italic styles.
Pro Easy on user's eyes
Due to it being readable on all types of displays, Iosevka isn't hard on the user's eyes.
Pro Free and open source
Iosevka is free and open source.
The developer is active and responds to user questions and issues.
Pro Ligature characters look great
Few fonts have a good ligation feature. Ligature characters (such as æ or the German ß) are supported in Iosevka and look just as you'd expect them to.
Narrow character width uses horizontal screen space more efficiently.
Pro Powerline support
Includes characters for supporting Powerline/Airline for terminals and terminal editors.
Pro Support for Cyrillic and Greek letters
Iosevka is quite flexible in that it supports Cyrillic and Greek letters.
Pro Also variant with tiny serifs available ("Slab")
For better reading longer texts.
Pro IPA Support
IPA is a system containing the sounds of spoken language and includes speech qualities such as intonation.
Pro Good CJK compatibility
Iosevka integrates CJK characters well, those being characters of the Chinese, Japanese, Korean, and occasionally Vietnamese languages.
Con Too narrow
Con Must do a custom build to get all ligatures
Con Fewer ligatures than other fonts
Iosevka has a nice ligation set, but it doesn't have as many ligatures as fonts like Hasklig, Monoid, or Pragmata Pro.