LangChain
A dark, developer-platform interface for the agent development lifecycle — built on a near-black blue-black canvas (#030710) with luminous pale-blue typography and a glowing cyan headline treatment. The system reads as engineered, technical, and calm: ultra-light Twklausanne display type at large sizes with tight negative tracking, monospaced-feeling Aeonik button/nav labels, square-cornered surfaces, and pill-shaped lifecycle tags floating over a faint line-art diagram. Brand voltage comes from the blue glow on the hero headline and the wide tonal range of pale-blue text on deep blue-black, not from saturated color blocks.
Works with
Claude Code·Cursor·Codex·Gemini CLI·Copilot·v0·Lovable·Bolt·Windsurf·Replit
Color Palette
Accent
Neutrals
Typography
display
56px · 300 · 1.1
The quick brown fox jumps
section
48px · 300 · 1.1
The quick brown fox jumps
title
32px · 300 · 1.1
The quick brown fox jumps
body
18px · 300 · 1.4
The quick brown fox jumps
button
16px · 400 · 1.5
The quick brown fox jumps
Spacing & Shape
Spacing
| Name | Value | Preview |
|---|---|---|
| xxs | 4px | |
| xs | 8px | |
| sm | 12px | |
| md | 16px | |
| lg | 24px | |
| xl | 32px | |
| xxl | 48px | |
| huge | 64px |
Border Radius
| Name | Value | Preview |
|---|---|---|
| none | 0px | |
| sm | 6px | |
| md | 8px | |
| lg | 16px | |
| xl | 32px | |
| pill | 80px |
FAQ
- What colors does LangChain use?
- LangChain's core palette includes #030710, #cce9ff, #7fc8ff, #99d3ff, #f2faff. The full color set with usage roles (canvas, ink, surfaces, accent, semantic) is documented in the LangChain DESIGN.md.
- What font does LangChain use?
- LangChain's primary typeface is Twklausanne. The complete type scale (sizes, weights, line-height and letter-spacing per role), with an open substitute where the original is licensed, is documented in the DESIGN.md.
- What is the LangChain design system?
- A dark, developer-platform interface for the agent development lifecycle — built on a near-black blue-black canvas (#030710) with luminous pale-blue typography and a glowing cyan headline treatment.…