Langfuse — design system & UI screens

AI · 1 screen · 13 sections · https://langfuse.com/

Light docs-style landing with a left resource sidebar; a highlighter-yellow headline, a model cost-and-latency tracking dashboard, and a customer logo wall (Twilio, Khan Academy, Cisco, Intuit).

Open in Mozaika →

This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/website/langfuse.

Decoded design system

Langfuse's decoded design system: background #EDEDE8, text #020817, accent #1863DC, link #020817, primary #1863DC; type scale h1 68px / h2 32px / body 18px; 4px spacing base; 2px base radius. The single interactive/action color is #1863DC — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#EDEDE8`
surface	`#DEDFDB`
border	`#C9CAC8`
text	`#020817`
text_muted	`#5B5F66`
primary	`#1863DC`
accent	`#1863DC`
link	`#020817`
secondary	`#4E4B66`
button_bg	`#1863DC`
button_text	`#FFFFFF`

Using these colors

Action color #1863DC — the single interactive color; only on things you click or must notice, never large fills.
primary, accent, button_bg are all #1863DC — one role, not several (the action color).
accent #1863DC — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
link #020817 — inline text links and link-styled controls.
secondary #4E4B66 — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.

Typography

Heading: Inter
Body: Inter
Mono: geistMono
h1: 68px
h2: 32px
body: 18px

Spacing

base unit: 4px
scale: 3px, 4px, 5px, 6px, 8px, 10px, 12px, 14px, 16px, 18px

Radii

base: 2px
button: 2px

Shadows (elevation)

card: rgba(172, 171, 171, 0.3) 0px -1px 10px 0px

Motion

Micro-interactions run at 150ms (dominant) with ease.

durations: 150ms · 180ms · 200ms
easings: ease · cubic-bezier(0.4, 0, 0.2, 1)
animated properties: border-color, color, background-color, outline-color

Native design tokens

Token	Value
`--color-purple-200`	`lab(87.8405% 13.4282 -18.7159)`
`--text-code-orange`	`#c17e2e`
`--color-rose-200`	`lab(86.806% 19.1909 4.07754)`
`--color-slate-200`	`lab(91.7353% -.998765 -4.76968)`
`--color-orange-600`	`lab(57.1026% 64.2584 89.8886)`
`--color-red-900`	`lab(28.5139% 44.5539 29.0463)`
`--color-orange-800`	`lab(37.1566% 46.6433 50.5562)`
`--color-fd-secondary`	`#ededed`
`--color-purple-800`	`lab(30.6017% 56.7637 -64.4751)`
`--color-orange-900`	`lab(30.2951% 36.0434 37.671)`

…and 110 more measured on the page.

Layout (measured)

container max-width: 840px
nav: 60px sticky, backdrop blur(12px)
common grid: 2 columns

Motion choreography (measured)

Load order: p.font-sans×4 → div.flex×2 → div.flex×2 → div.group → section.mx-auto×2 → a.focus-visible:outline-no

Scroll reveal: 6 elements rest at opacity 0, animate in over 0.7s ease.

Responsive (measured)

breakpoints: 768px · 1012px · 1400px
mobile (390px): hero 32px · nav inline

Full design system, per-section tokens & DESIGN.md / Tailwind / CSS exports →

Screens

Langfuse - Open Source AI Engineering Platform