Anthropic Brand Colors

Anthropic Brand Colors & Design Standards

Official Brand Color Palette

Primary Colors

• Anthropic Identity Light (Background): #F5F5F5
• Primary background for posters and documents
• Off-white, neutral, professional
• High contrast with text elements

• Anthropic Corporate Dark (Casing/Primary Dark): #1A1A1A
• Deep charcoal, nearly black
• Used for primary structural elements
• Professional, premium appearance

Brand Accents

• Primary Brand Accent (Interaction/Highlights): #6366F1
• Indigo blue, modern and focused
• Used for primary UI elements, connectors, key interaction points
• Maintains good contrast on light backgrounds

• Secondary Brand Accent (Thermal/Systems): #8B5CF6
• Purple accent, warm and complementary
• Used for secondary systems and thermal elements
• Distinguishes subsystems from primary accents

• Tertiary Brand Accent (PCB/Electronics): #3B82F6
• Bright blue, digital/technical feel
• Used for circuit boards and electrical components
• Conveys technology and precision

Supporting Colors

• Muted Mid Gray (Annotations/Leader Lines): #9CA3AF
• Medium gray, subtle and non-intrusive
• Used for annotation lines, borders, supporting text
• Low contrast to maintain minimalism

Typography Standards

Primary Heading Font

Font Family: Inter

• Weight: Bold (700)
• Size: 64-72px for primary titles
• Letter Spacing: -0.02em (tight tracking)
• Color: Anthropic Corporate Dark (#1A1A1A)

Secondary/Annotation Font

Font Family: Inter or System Sans-serif

• Weight: Regular (400) to Medium (500)
• Size: 12-18px for annotations
• Color: Muted Mid Gray for non-critical labels
• Color: Corporate Dark for critical labels

Fallback Fonts (if Inter unavailable)

• DejaVuSans
• Arial
• Helvetica
• System sans-serif

Design Principles

Minimalism

• Low saturation across all colors
• Avoid neon or high-intensity gradients
• Use color strategically for hierarchy and function
• Ample whitespace and breathing room

Technical Application

• Structural elements: Corporate Dark
• Interactive/primary focus: Primary Brand Accent
• Secondary systems: Secondary Brand Accent
• Technical components: Tertiary Brand Accent
• Supporting details: Muted Mid Gray

Contrast & Accessibility

• All text meets WCAG AA contrast requirements
• Corporate Dark on Identity Light: 16.5:1 contrast ratio
• Primary Accent on Identity Light: 7.2:1 contrast ratio
• Muted Gray for secondary information only

Implementation Notes

RGB Equivalents

Anthropic Identity Light: RGB(245, 245, 245)
Anthropic Corporate Dark: RGB(26, 26, 26)
Primary Brand Accent: RGB(99, 102, 241)
Secondary Brand Accent: RGB(139, 92, 246)
Tertiary Brand Accent: RGB(59, 130, 246)
Muted Mid Gray: RGB(156, 163, 175)

Usage Rules

1. Never use pure white (#FFFFFF) - use Identity Light instead
2. Never use pure black (#000000) - use Corporate Dark instead
3. Accents should never exceed 20% of total poster area
4. Always maintain minimum 2px stroke width for accent lines
5. Annotation text should be muted gray or corporate dark, never accent colors

Brand Application for Technical Diagrams

Device/Hardware

• Outer casing: Corporate Dark
• Internal critical components: Primary Accent
• Thermal/cooling systems: Secondary Accent
• Circuit boards/electronics: Tertiary Accent
• Structural elements: Muted Gray

Annotations & Details

• Leader lines: Muted Gray (1-2px stroke)
• Labels: Muted Gray for non-critical, Corporate Dark for important
• Emphasis: Primary Brand Accent for critical callouts

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: cxcscmu
• Source: cxcscmu/SkillLearnBench
• License: MIT
• Homepage: https://cxcscmu.github.io/SkillLearnBench

Install and usage instructions live in the source repository linked above.