# IBM Plex — card for AI agents

Open-source typeface family (Sans, Serif, Mono, Condensed, Math) with multi-script support, released under the SIL Open Font License.

Category: Fonts · maker IBM Corp. · checked 2026-10-12

## Price
- Price: Free
- Free tier: Free to download and use under the SIL OFL

## License
SIL Open Font License 1.1 — https://github.com/IBM/plex/blob/HEAD/LICENSE.txt

- commercial: **yes** (Commercial use OK)
  > Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies
  (https://github.com/IBM/plex/blob/HEAD/LICENSE.txt)
- attribution: **no** (No credit needed)
  > may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license.
  (https://github.com/IBM/plex/blob/HEAD/LICENSE.txt)
- in app: **yes** (Can ship inside your app)
  > The fonts, including any derivative works, can be bundled, embedded, redistributed and/or sold with any software provided that any reserved names are not used by derivative works.
  (https://github.com/IBM/plex/blob/HEAD/LICENSE.txt)

## Rules to follow
- Keep the copyright notice and OFL license text with any fonts you ship.
- Do not sell the font files by themselves.
- Do not use the Reserved Font Name "Plex" for a modified version.
- Distribute the font files, original or modified, only under the OFL.

## How an agent gets files
- Download the zip files from the GitHub releases page, or npm install per family under the @ibm scope (@ibm/plex-sans, @ibm/plex-serif, @ibm/plex-mono, @ibm/plex-math and regional variants). (sign-in: none)
- Not allowed: Neither the Font Software nor any of its components may be sold by itself
- Not allowed: No modified version may use the Reserved Font Name without written permission
- Not allowed: Keep the copyright notice and OFL text with copies

## HTML/CSS (official example, https://github.com/IBM/plex/blob/master/packages/plex-sans/README.md)

```
npm install @ibm/plex-sans

font-family: 'IBM Plex Sans';
```

## How to connect
- Package (npm/PyPI)
- npm: `npm install @ibm/plex-sans`
- Repository: https://github.com/IBM/plex
- Website: https://www.ibm.com/plex/

## Notes
Added automatically: 11,685 GitHub stars. License read from the official pages.

## Numbers (AgentGid data)
- Gid Score: 43.3
- GitHub stars: 11,723
- Downloads last week: 95,652

## Lines to paste into your prompt or AGENTS.md

```
- IBM Plex (Fonts). Open-source typeface family (Sans, Serif, Mono, Condensed, Math) with multi-script support, released under the SIL Open Font License. Price: free; commercial use OK; no credit needed.
  Connect: npm @ibm/plex-sans.
  Get files: Download the zip files from the GitHub releases page, or npm install per family under the @ibm scope (@ibm/plex-sans, @ibm/plex-serif, @ibm/plex-mono, @ibm/plex-math and regional variants).
  Not allowed: Neither the Font Software nor any of its components may be sold by itself
  Not allowed: No modified version may use the Reserved Font Name without written permission
  Not allowed: Keep the copyright notice and OFL text with copies
  Rule: Keep the copyright notice and OFL license text with any fonts you ship.
  Rule: Do not sell the font files by themselves.
  Rule: Do not use the Reserved Font Name "Plex" for a modified version.
  Rule: Distribute the font files, original or modified, only under the OFL.
  License: https://github.com/IBM/plex/blob/HEAD/LICENSE.txt (checked 2026-10-12; details: https://agentgid.com/assets/ibm-plex/)
```

## Links
- AgentGid page: https://agentgid.com/assets/ibm-plex/
- Is it free for commercial use? https://agentgid.com/assets/ibm-plex/commercial-use/
- Source: https://www.ibm.com/plex
- Source: https://github.com/IBM/plex/blob/HEAD/LICENSE.txt
- Source: https://github.com/IBM/plex

---
AgentGid's catalog is curated: every entry was checked against the maker's official pages (registry, repository, license and pricing pages) on the date shown; a license value shows the quote it stands on wherever AgentGid has one. Usage numbers come from AgentGid's own scan of public repositories set up for AI coding agents. Claims by makers are reported, not tested by AgentGid.