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LangChain

A dark page, one blue accent, set in Twklausanne and Aeonik.

langchain.com
The home page of LangChain

The home page on 6 November 2026. Sites change; ask plagio for today's.

Pages

Colours

Each role is picked from where the colour is used and how much of the page it covers.

  • Background#030710

    What the page itself is painted on, 9.3% of painted area, 1 button, 8 links, 30% of colour uses.

  • Surface#05070b

    The next neutral background, close in lightness to the page, 27% of painted area.

  • Text#ffffff

    The strongest colour carrying body text, 20.16:1 on the background, 1 link, 13% of colour uses.

  • Muted text#ffffff99

    Secondary text, 7.32:1 on the background, 20% of colour uses.

  • Accent#7fc8ff

    The most colourful colour in use (chroma 0.50), 17% of colour uses.

  • Border#2f4b68

    A faint neutral line, 2.23:1 on the background, 0.4% of colour uses.

Also in use

  • #f2faff
  • #e5f4ff
  • #0a101c
  • #cce9ff
  • #c3ddf880
  • #03071099
  • #8b96a8

Type

Twklausanne, Aeonik. The steps below are the sizes the page uses most, set in our font so you can compare them.

SampleFamilySizeWeightLine heightTracking
AaTwklausanne80px30088px-2.4px
AaTwklausanne64px30070.4px-1.92px
AaTwklausanne56px30061.6px-1.68px
AaTwklausanne56px30061.6px-0.84px
AaTwklausanne48px30050.4px-0.96px
AaTwklausanne32px30035.2px-0.96px
AaTwklausanne24px30034.8pxnormal

Use LangChain's system on your site

Paste this into Claude Code, Cursor or any agent with plagio connected. It reads the site live, with spacing, radii, shadows and the states this page leaves out.

Use plagio's extract_brand on https://langchain.com/, then restyle my site with its colours, type scale and spacing. Keep my content, layout and logo; take the system, not LangChain's copy.

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