IBM Plex Serif is a free serif typeface designed by Mike Abbink, Bold Monday. It is used by 1 of the 407 sites we analyzed, which ranks it joint number 54 among the 100 website fonts you can get. You can use it without paying.
IBM Plex Serif at a glance
- Rank
- =54 of 100, by number of analyzed sites using it
- Used on
- 1 site of 407 analyzed (0%)
- Style
- Serif
- Designer
- Mike Abbink, Bold Monday
- Licence
- Free, open source
- Added to Google Fonts
- March 11, 2018
- Source
- Google Fonts, checked October 21, 2026
Where is IBM Plex Serif used?
IBM Plex Serif is the headline font on 1 of the 1 site that use it. Where it is not the biggest font for a job, it draws a smaller share of the text, such as labels or buttons.
| Industry | Sites using it | Of analyzed sites in that industry |
|---|---|---|
| Developer tools and infrastructure | 1 | 2% |
Which websites use IBM Plex Serif?
Each link opens the free font finder on that site.
- railway.com Developer tools and infrastructure · headings · 4.6% of its text
What does IBM Plex Serif pair with?
| Used together with | Sites | As |
|---|---|---|
| Inter | 1 | heading and body |
A pairing here means two different typefaces that are the biggest font for different jobs on the same site. It shows what real sites do, which is a good starting point and not a rule. All pairings.
Where do I get IBM Plex Serif?
IBM Plex Serif is open source and free to use, including commercially. Download it from Google Fonts.
Google Fonts · checked October 21, 2026.
How do we know?
Each site was opened twice in a real browser and Chrome was asked which font file drew each piece of text. We count a font for a site only if both runs saw it and it drew at least 2% of the site’s custom-font text. The full method.
Other serif fonts in the ranking
FAQ
Is IBM Plex Serif free?
Yes. It is open source and free for commercial use, and available from Google Fonts.
Who designed IBM Plex Serif?
IBM Plex Serif was designed by Mike Abbink, Bold Monday. The source link on this page is where that is credited.
Which websites use IBM Plex Serif?
Of the 407 sites we analyzed, 1 site draw text in IBM Plex Serif: railway.com. The list on this page links each one to the font finder.
What fonts pair well with IBM Plex Serif?
On the sites we analyzed, IBM Plex Serif appears alongside Inter (1 site). That shows what real sites do, not a rule.
How do you know which font a site uses?
We open each site in a real browser and ask Chrome which font file it used to draw each piece of text, so renamed and self-hosted fonts are named by the file itself. Each site was measured twice, and a font counts only if both runs saw it.