Hack vs Iosevka

Hack is free for unlimited commercial and non-commercial use. The webfonts are hinted (TrueType instruction set) to optimize display on the screen and are built into all commonly used web font formats with each new release. They include the complete release character set and smaller (filesize) basic Latin subset releases. They are available in the build directory of the repository.

The tilde symbol ('~'), comma (',') and semicolon (';') glyphs have been modified to be more readable at small sizes and/or on non-HD displays. In addition, the underscore symbol ('_') has been slightly lifted for alignment with surrounding characters.

Including Debian/Ubuntu (fonts-hack), Fedora (font-hack-ttf), OpenSUSE (hack-fonts), Arch (ttf-hack) and probably many more. Much nicer than having to manually install/update

The fonts are in the Vera Sans Mono lineage with a significant expansion of the character set (which includes Cyrillic and modern Greek character sets), new glyph shapes and modifications of the original glyph shapes, as well as improvements in metrics and hinting/TT instructions to make it more legible at small text sizes used for source code.

The changelog is available here.

The regular set is patched with Powerline glyphs by default. There is no need to patch the font to use it in Powerline environments.

UFO source format is widely supported by all modern font editors if you would like to modify the typeface.

Iosevka is very clear and legible on all displays and in all sizes.

Narrow character width uses horizontal screen space more efficiently.

This font comes in seven different weights, ranging from thin and extra-light to heavy.

There is full customization of styles and variants in Iosevka.

Iosevka is quite flexible in that it supports Cyrillic and Greek letters.

Iosevka is free and open source.

Includes characters for supporting Powerline/Airline for terminals and terminal editors.

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.

Many of the common styles are available, including Sans Serif and Slab Serif with normal, bold, italic, and bold italic styles.

IPA is a system containing the sounds of spoken language and includes speech qualities such as intonation.

Due to it being readable on all types of displays, Iosevka isn't hard on the user's eyes.

The developer is active and responds to user questions and issues.

Iosevka integrates CJK characters well, those being characters of the Chinese, Japanese, Korean, and occasionally Vietnamese languages.

For better reading longer texts.