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Designs rubyonrails.org

What font does Ruby on Rails use? Calibre.

Ruby on Rails's website sets its type in Calibre, on a light #F0E7E9 canvas with #261B23 text and a #D30001 accent. Copy the palette and fonts, or a ready prompt to build something original in this style with Claude Code, Cursor, Lovable or v0.

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      prompt.md

      Ruby on Rails fonts and type scale

      Ruby on Rails's website sets both headings and body text in Calibre, with IBM Plex Mono for code. Body text is 21px, section headings 36px and the largest display type 78px, at weight 700. If you can't use Calibre, ask your AI for the closest free match and keep the sizes and weights.

      Ruby on Rails color codes

      Canvas#F0E7E9the page background
      Surface#FFFFFFcards and raised areas
      Text#261B23primary text
      Accent#D30001buttons, links and focus
      Muted#5A5153secondary text and captions
      Border#E6DDDFdividers and outlines

      How do I build a site that looks like Ruby on Rails with AI?

      Open the Prompt tab above, change its first line to what you are building, and paste it into Lovable, v0, Bolt, Claude Code or Cursor. For a whole project, install the Claude skill or the Cursor rule instead, so every screen keeps the style. Build something original: keep Ruby on Rails's look, not its name, logo or copy.

      Read from rubyonrails.org's public CSS on 25 October 2026. Siteprint is not affiliated with Ruby on Rails; names and trademarks belong to their owners.