plex

Project Overview

IBM Plex is IBM's corporate typeface family, developed over two years and released as an open-source project. The family includes Sans, Serif, Mono, and Sans Condensed, all with Roman and true italics, plus language extensions covering Arabic, Cyrillic, Greek, Hebrew, Japanese, Korean, Thai, Traditional Chinese, and Devanagari. The repository provides all font files and source files, and also includes IBM Plex Math, a math font with over 5,000 glyphs covering operators, double-struck, arrows, Greek letters, phonetics, and geometric symbols.

Item	Value
Type	Open-source typeface family
Main faces	Sans, Serif, Mono, Sans Condensed
Languages	Extended Latin, Arabic, CJK, Cyrillic, Greek, and more
License	SIL OFL 1.1

A free corporate-grade typeface family spanning multiple scripts and mathematical typesetting.

Key Features

• Four main families: Sans, Serif, Mono, and Sans Condensed, each with Roman and true italics
• Multilingual coverage: Plex Sans supports extended Latin, Arabic, Cyrillic, Greek, Hebrew, Japanese, Korean, Thai, Traditional Chinese, and more
• Math font: IBM Plex Math ships 5,000+ glyphs including operators, double-struck, Fraktur, arrows, and phonetic symbols
• UI oriented: designed for interface environments, suitable for web and desktop typography
• Multiple channels: install via zip downloads or npm packages, per family
• Open sources: font source files included for customization

Target Audience

• Designers needing free fonts for commercial use
• Frontend developers building interfaces and websites
• Researchers typesetting mathematical documents
• Teams seeking a unified brand voice

Quick Start

1. Download the zip package for the family you need from the releases page
2. Extract and double-click the font files to install
3. For web projects, add families via npm

   npm install @ibm/plex-sans

4. Reference the font name in your styles

Core Advantages

• Completely free: OFL licensed with no commercial fees
• Complete family: four main faces plus a dozen language sub-families for consistent mixing
• Math typesetting: IBM Plex Math is among the most complete math fonts available

System Requirements

Item	Requirement
Install	Desktop font install / npm package
License	SIL OFL 1.1
Use cases	UI, web, documents, print

Notes

• Split packages: language extensions ship separately from the main families; download the specific family zip you need
• True italics: Plex uses true italic designs rather than slanted romans; check style mapping when substituting system fonts