Tints & Shades
50
100
200
300
400
500
600
700
800
900
Scale from white (50) through International Klein Blue (500) to black (900), interpolated in Lab color space.
Color Values
- HEX
- #002FA7
- RGB
- rgb(0, 47, 167)
- HSL
- hsl(223, 100%, 33%)
- OKLCH
- oklch(0.378 0.195 263)
- CMYK
- cmyk(100%, 72%, 0%, 35%)
--color-international-klein-bluebg-[#002FA7]Accessibility
Score: 96/100On White (#FFF)
10.69:1
On Black (#000)
1.96:1
On Light Gray (#F5F5F5)
9.8:1
Best text color on this background:
Design Applications
background-color: #002FA7
color: #002FA7
bg-[#002FA7] text-[#FFFFFF]
border-left: 4px solid #002FA7
Color Harmonies
Complementary
Forsythia
#EDAA00
Split-Complementary
Similar Colors
Color Meaning & Psychology
Blue is the world's most universally preferred color across cultures. It slows respiration, lowers blood pressure, and promotes calm — the physiological opposite of red. Blue's associations with sky and water make it feel limitless, trustworthy, and reliable. In corporate design, blue dominates banking, insurance, healthcare, and technology precisely because it communicates stability. Dark navy conveys authority and tradition; royal blues suggest quality and aspiration; sky blues feel open and optimistic; teal bridges trust with modernity. The primary limitation of blue is food — it suppresses appetite, with almost no naturally blue foods existing in nature. Its deeper, richer tone gives it gravitas and sophistication, making it well-suited for primary brand colors, typography, and contexts where authority matters.
Industry Usage
Common contexts and industries where International Klein Blue is applied in professional design.
- Banking, insurance, and financial institutions
- Healthcare and medical device companies
- Enterprise software and SaaS platforms
- Government and public sector organizations
- Airlines and aviation brands
- Communication and social networking apps
- Cybersecurity and data protection products
- Pharmaceutical companies and clinical products
Accessibility Considerations
Normal Text
Passes AA
4.5:1 minimum required
Large Text
Passes AA Large
3:1 minimum required
UI Components
Meets 1.4.11
3:1 for non-text UI
International Klein Blue is a dark color. Use white (#FFFFFF) text on top of it for maximum readability (10.69:1). Avoid small black text on this background.
CSS & Code Examples
Background
background-color: #002FA7;Text
color: #002FA7;Border
border: 2px solid #002FA7;Box Shadow
box-shadow: 0 4px 20px #002FA740;Gradient
background: linear-gradient(135deg, #002FA7, #5558da);Tailwind-style
--color-international-klein-blue: #002FA7;Tailwind CSS Utilities
Use arbitrary value syntax in Tailwind CSS to apply International Klein Blue without a custom config.
Background
bg-[#002FA7]Text
text-[#002FA7]Border
border-[#002FA7]Ring
ring-[#002FA7]Fill
fill-[#002FA7]From (gradient)
from-[#002FA7]Via (gradient)
via-[#002FA7]To (gradient)
to-[#002FA7]Design Tokens
Ready-to-use International Klein Blue design token in CSS custom properties, SCSS, Tailwind v3/v4, and JSON formats.
CSS Custom Properties
:root {
--color-international-klein-blue: #002FA7;
--color-international-klein-blue-rgb: 0, 47, 167;
--color-international-klein-blue-hsl: 223, 100%, 33%;
}SCSS Variables
$color-international-klein-blue: #002FA7; $color-international-klein-blue-rgb: 0, 47, 167; $color-international-klein-blue-hsl: 223, 100%, 33%;
Tailwind v3 Config
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
'international-klein-blue': '#002FA7',
},
},
},
};Tailwind v4 (@theme)
/* tailwind.css */
@theme {
--color-international-klein-blue: #002FA7;
}JSON Design Token (W3C format)
{
"international-klein-blue": {
"value": "#002FA7",
"type": "color",
"description": "International Klein Blue — #002FA7"
}
}More blue colors
View all →What Does International Klein Blue Mean? Color Psychology & Cultural Symbolism
Where red demands action and green signals approval, blue invites consideration. International Klein Blue (#002FA7) operates in this reflective register—its deep character at 33% lightness creating space for calm to develop gradually rather than announce itself.
- Blue is the most universally trusted color in Western design—associated with authority (government, police, corporate), intelligence (universities, technology), and emotional calm (water, sky). It's the dominant color in corporate branding precisely because it creates immediate credibility.
- In Chinese tradition, blue represents immortality and the heavens, associated with the element of wood and spring vitality. In many Islamic cultures, blue offers protection from evil (the "evil eye" tradition), and in Indian traditions it's associated with divinity (Krishna).
- International Klein Blue's deep lightness (33%) shifts its psychological register: Navy and deep blues project gravitas, authority, and executive-level trust—the dominant choice for financial services, law firms, and premium B2B brands.
- At 100% saturation, International Klein Blue reads as vivid—Electric and royal blues are modern, confident, and digitally native—they signal tech-forward positioning and work well for startups challenging traditional industries.
In a world of visual noise, International Klein Blue earns attention through steadiness. Use it where you need to be believed.
How to Use International Klein Blue in Design: Applications, Pairings & Best Practices
International Klein Blue's accessibility profile makes it one of the more designer-friendly choices in the warm-cool spectrum. Its deep quality at 33% lightness typically produces workable contrast ratios for both text and UI applications.
- UI components: primary brand color, link color, interactive states—International Klein Blue performs reliably in all these roles with its deep tonal character.
- Brand & identity: corporate identity, banking and finance UIs, healthcare platforms—contexts where International Klein Blue's vivid quality creates the right register.
- Typography: International Klein Blue works as a background behind white text but requires careful sizing—test at intended heading and body sizes before finalizing.
- As a dark tone, International Klein Blue creates maximum contrast with white and light neutrals—excellent for creating premium dark-mode sections, bold headers, and high-drama brand moments
- Proportional use: International Klein Blue's vivid saturation (100%) means small applications—accents, highlights, icons—deliver maximum impact without visual fatigue. Reserve large-scale use for intentional brand moments.
In a world of visual noise, International Klein Blue earns attention through steadiness. Use it where you need to be believed.
International Klein Blue Accessibility: WCAG Contrast Ratios, Color Blindness & Inclusive Design
International Klein Blue (#002FA7) achieves a 10.69:1 contrast ratio with white text, surpassing the WCAG 2.1 AAA threshold of 7:1. This exceptional contrast qualifies it for body text, UI components at any size, and all accessibility-sensitive interface contexts. Relative luminance: 4.8%.
- As text on white (#FFFFFF): 10.69:1 — AAA ✓
- As text on black (#000000): 1.96:1 — Fail
- Best text color on International Klein Blue background: White (#FFFFFF) at 10.69:1
- WCAG 2.1 luminance: 4.8% — low luminance (dark)—it provides strong contrast for white and light overlaid text, functioning well as a background in dark-mode and header contexts
- International Klein Blue qualifies for all text sizes including small body copy (AAA).
- Color blindness consideration: tritanopia (blue-yellow color blindness, ~0.003% of population) may affect how this color reads. While rare, for maximum accessibility supplement color signals with text or icon indicators in critical states.
International Klein Blue's WCAG profile makes it a compliant choice for most text applications.
International Klein Blue in Industry: Branding, Design & Market Applications
International Klein Blue (#002FA7) is most at home in industries where trust, reliability, calm, and professionalism are key brand values. Its deep quality makes it particularly effective in Finance & Banking contexts, where the vivid saturation signals reliability at exactly the right register.
- Finance & Banking: Blue is the most trusted color in financial services—a global design convention built over decades. It signals fiduciary reliability, stability, and the conservative stewardship that depositors and investors need to feel comfortable transferring wealth. (examples: JPMorgan Chase, Goldman Sachs, Visa) Dark navy communicates established tradition; mid-tone blues suggest accessible, modern banking. Avoid pure bright blue for legacy institutions.
- Technology: Technology brands use blue to communicate intelligence, reliability, and forward-thinking professionalism. From legacy enterprise software to consumer apps, blue provides a neutral credibility that scales across markets and cultures. (examples: Apple, Microsoft, Salesforce) Varying the tone of blue is how tech brands differentiate: sky blue for friendliness (consumer apps), royal blue for confidence (productivity tools), navy for enterprise seriousness.
- Healthcare: Healthcare's use of blue is a trust transfer from corporate credibility to clinical reliability. Patients associate blue with cleanliness, precision, and medical competence—making it the second most common healthcare color after white. (examples: Headspace, One Medical, Kaiser Permanente) Teal-blue works particularly well for health tech and telemedicine, balancing clinical trust with digital accessibility.
- Brand positioning: International Klein Blue is best suited for brands projecting trustworthiness, reliability, professionalism. Categories outside this positioning—food contexts where it suppresses appetite (the only major color with no natural blue foods)—tend to see weaker results.
- Adjacent applications: Beyond primary industries, International Klein Blue works effectively in corporate identity, banking and finance UIs, healthcare platforms—contexts where reliability serves a secondary but reinforcing role.
The industries where International Klein Blue performs best are those where the audience expects reliability. Build brand strategy around this alignment, not against it.
Accessibility & Design Guides
Frequently Asked Questions
- What is the hex code for International Klein Blue? ▾
- The hex code for International Klein Blue is #002FA7. Its RGB values are rgb(0, 47, 167) and its HSL values are hsl(223, 100%, 33%).
- What does International Klein Blue mean in design? ▾
- Blue is the world's most universally preferred color across cultures. It slows respiration, lowers blood pressure, and promotes calm — the physiological opposite of red. Blue's associations with sky and water make it feel limitless, trustworthy, and reliable. In corporate design, blue dominates banking, insurance, healthcare, and technology precisely because it communicates stability. Dark navy conveys authority and tradition; royal blues suggest quality and aspiration; sky blues feel open and optimistic; teal bridges trust with modernity. The primary limitation of blue is food — it suppresses appetite, with almost no naturally blue foods existing in nature. Its deeper, richer tone gives it gravitas and sophistication, making it well-suited for primary brand colors, typography, and contexts where authority matters.
- Is International Klein Blue WCAG accessible? ▾
- International Klein Blue (#002FA7) passes WCAG AAA on white with a 10.69:1 contrast ratio. Its overall accessibility score is 96/100.
- What colors go well with International Klein Blue? ▾
- International Klein Blue pairs well with its complementary color Forsythia (#EDAA00). Analogous colors like Non-Photo Blue and Alice Blue also work harmoniously. Check the Color Harmonies section above for the full palette.
- What is International Klein Blue used for? ▾
- International Klein Blue is commonly used for: Banking, insurance, and financial institutions; Healthcare and medical device companies; Enterprise software and SaaS platforms; Government and public sector organizations; Airlines and aviation brands.
- What are the CSS and Tailwind values for International Klein Blue? ▾
- In CSS, use `color: #002FA7` or `background-color: #002FA7`. The CSS custom property is `--color-international-klein-blue: #002FA7`. In Tailwind CSS, use the arbitrary value class `bg-[#002FA7]` for backgrounds or `text-[#002FA7]` for text.