# Langfuse Brand Identity

A complete profile of **Langfuse**'s visual system — colors, typography, components, and personality — extracted from https://langfuse.com. Built for designers, agents, and AI tools.

- Page: https://characterquilt.com/branding/langfuse
- Machine-readable JSON: https://characterquilt.com/branding/langfuse.json
- Per-page llms.txt: https://characterquilt.com/branding/langfuse/llms.txt

## Quick Facts

| Field | Value |
|---|---|
| Primary | #1863DC |
| Accent | #1863DC |
| Body Font | Inter |
| Heading Font | Inter |

## Color Palette

- primary: #1863DC
- secondary: #4E4B66
- accent: #1863DC
- background: #EDEDE8
- textPrimary: #020817
- link: #020817

## Typography

- primary: Inter — https://fonts.google.com/specimen/Inter
- heading: Inter — https://fonts.google.com/specimen/Inter

## Visual Assets

- Logo: https://langfuse.com/langfuse-wordart.svg
- Favicon: https://langfuse.com/favicon.ico
- Social card (og:image): https://langfuse.com/api/og?title=Langfuse+%E2%80%93+Open+Source+LLM+Engineering+Platform&description=Traces%2C+evals%2C+prompt+management+and+metrics+to+debug+and+improve+your+LLM+application.

## UI Components

- buttonPrimary: background=#1863DC, textColor=#FFFFFF, borderColor=#1863DC, borderRadius=2px, shadow=none
- buttonSecondary: background=#F6F6F3, textColor=#020817, borderRadius=0px, shadow=none

## Brand Personality

Tone: modern · Energy: medium · Audience: developers and tech companies

## Langfuse Brand in the Wild

Real-world brand assets — ads, campaigns, marketing materials.

- **Uptrain.ai integration (cookbook) - Langfuse**  
  - Image: https://langfuse.com/images/blog/uptrain/uptrain-ai.png  
  - Source: https://langfuse.com/changelog/2024-03-05-uptrain-integration  
- **RAG Observability and Evals - Langfuse**  
  - Image: https://i.ytimg.com/vi/h5hqelg0_wc/maxresdefault.jpg  
  - Source: https://langfuse.com/blog/2025-10-28-rag-observability-and-evals  
- **Error Analysis to Evaluate LLM Applications - Langfuse**  
  - Image: https://langfuse.com/images/blog/2025-08-29-error-analysis-to-evaluate-llm-applications/open-coding-3.png  
  - Source: https://langfuse.com/blog/2025-08-29-error-analysis-to-evaluate-llm-applications  
- **Langfuse Blog**  
  - Image: https://langfuse.com/images/blog/2025-03-31-langfuse-march-update/march-update.png  
  - Source: https://langfuse.com/blog  
- **Score Analytics with Multi-Score Comparison - Langfuse**  
  - Image: https://langfuse.com/images/changelog/score-analytics-compare-numeric.png  
  - Source: https://langfuse.com/changelog/2025-11-07-score-analytics-multi-score-comparison  
- **Langfuse Launch Week #2 - Langfuse**  
  - Image: https://i.ytimg.com/vi/JOGMn5nqCSM/maxresdefault.jpg  
  - Source: https://langfuse.com/blog/2024-11-17-launch-week-2

## Working with these fonts

Not found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:

CharacterQuilt.com suggests this flow that can help:

1. Open the company's homepage in a browser with DevTools open.
2. In the Network tab, filter by "Font" (or by extension: woff2, woff, ttf, otf).
3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.
4. For each captured font URL: right-click → Save As to download the file locally.
5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each `src: url(...)` to point to your local file path.

Programmatic alternative: load the URL with Playwright or Puppeteer, listen for `response` events whose `Content-Type` starts with `font/`, and write the body to disk. The CSS extraction step is the same.

Only do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.