Tints & Shades
50
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Scale from white (50) through Cool Blue (500) to black (900), interpolated in Lab color space.
Color Values
- HEX
- #4F84C4
- RGB
- rgb(79, 132, 196)
- HSL
- hsl(213, 50%, 54%)
- OKLCH
- oklch(0.605 0.113 254)
- CMYK
- cmyk(60%, 33%, 0%, 23%)
--color-cool-bluebg-[#4F84C4]Accessibility
Score: 39/100On White (#FFF)
3.87:1
On Black (#000)
5.43:1
On Light Gray (#F5F5F5)
3.55:1
Best text color on this background:
Design Applications
background-color: #4F84C4
color: #4F84C4
bg-[#4F84C4] text-[#000000]
border-left: 4px solid #4F84C4
Color Harmonies
Complementary
Desert
#C19A6B
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. At medium lightness, it is the most versatile tone of this hue family — readable as text on light backgrounds, yet vibrant enough as a visual accent.
Industry Usage
Common contexts and industries where Cool 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
Fails 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
Cool Blue is a light color. Use black (#000000) text on top of it for maximum readability (5.43:1). Avoid white text on this background.
CSS & Code Examples
Background
background-color: #4F84C4;Text
color: #4F84C4;Border
border: 2px solid #4F84C4;Box Shadow
box-shadow: 0 4px 20px #4F84C440;Gradient
background: linear-gradient(135deg, #4F84C4, #83b3f7);Tailwind-style
--color-cool-blue: #4F84C4;Tailwind CSS Utilities
Use arbitrary value syntax in Tailwind CSS to apply Cool Blue without a custom config.
Background
bg-[#4F84C4]Text
text-[#4F84C4]Border
border-[#4F84C4]Ring
ring-[#4F84C4]Fill
fill-[#4F84C4]From (gradient)
from-[#4F84C4]Via (gradient)
via-[#4F84C4]To (gradient)
to-[#4F84C4]Design Tokens
Ready-to-use Cool Blue design token in CSS custom properties, SCSS, Tailwind v3/v4, and JSON formats.
CSS Custom Properties
:root {
--color-cool-blue: #4F84C4;
--color-cool-blue-rgb: 79, 132, 196;
--color-cool-blue-hsl: 213, 50%, 54%;
}SCSS Variables
$color-cool-blue: #4F84C4; $color-cool-blue-rgb: 79, 132, 196; $color-cool-blue-hsl: 213, 50%, 54%;
Tailwind v3 Config
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
'cool-blue': '#4F84C4',
},
},
},
};Tailwind v4 (@theme)
/* tailwind.css */
@theme {
--color-cool-blue: #4F84C4;
}JSON Design Token (W3C format)
{
"cool-blue": {
"value": "#4F84C4",
"type": "color",
"description": "Cool Blue — #4F84C4"
}
}More blue colors
View all →What Does Cool Blue Mean? Color Psychology & Cultural Symbolism
Cool Blue at #4F84C4 is a medium expression of the trust spectrum. Blue tones are processed by the brain's credibility centers before conscious evaluation—which is why virtually every major financial institution, technology company, and government body defaults to the blue family to establish authority.
- 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).
- Cool Blue's medium lightness (54%) shifts its psychological register: a balanced mid-tone that embodies trust, reliability, calm, and professionalism at its most direct.
- At 50% saturation, Cool Blue reads as subdued—neither overwhelming nor passive, landing in the trust, reliability, calm, and professionalism zone with measured confidence.
The power of Cool Blue is quiet consistency. It builds trust cumulatively, appearing wherever credibility matters.
How to Use Cool Blue in Design: Applications, Pairings & Best Practices
The design challenge with Cool Blue is differentiation: every major institution uses blue. The answer lies in tone, proportion, and pairing—how a specific blue is used matters more than whether it's used.
- UI components: primary brand color, link color, interactive states—Cool Blue performs reliably in all these roles with its medium tonal character.
- Brand & identity: corporate identity, banking and finance UIs, healthcare platforms—contexts where Cool Blue's subdued quality creates the right register.
- Typography: Cool Blue as text requires a dark background; its 54% lightness means it provides 3.9:1 contrast on white, not meeting WCAG AA.
- Cool Blue creates strong legibility with black text overlays (5.4:1 contrast ratio), making it a reliable background or surface color in design systems
- Proportional use: Cool Blue's subdued quality means it scales well across proportions—from full-bleed backgrounds to single-pixel borders—making it an unusually versatile palette component.
The power of Cool Blue is quiet consistency. It builds trust cumulatively, appearing wherever credibility matters.
Cool Blue Accessibility: WCAG Contrast Ratios, Color Blindness & Inclusive Design
Cool Blue (#4F84C4) reaches 5.43:1 contrast with black text—meeting WCAG 2.1 AA minimum of 4.5:1 for normal text and 3:1 for large text. It clears standard production accessibility requirements. Relative luminance: 22.1%.
- As text on white (#FFFFFF): 3.87:1 — AA (large text only)
- As text on black (#000000): 5.43:1 — AA ✓
- Best text color on Cool Blue background: Black (#000000) at 5.43:1
- WCAG 2.1 luminance: 22.1% — mid-range luminance—it sits in the transition zone where both dark and light text approaches require testing against the 4.5:1 WCAG threshold
- Cool Blue qualifies for normal body text and all larger sizes (AA).
- 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.
For production use, test Cool Blue against your specific background colors rather than assuming #FFFFFF or #000000 performance translates. Surrounding colors alter perceived contrast.
Cool Blue in Industry: Branding, Design & Market Applications
Cool Blue's brand positioning falls squarely in the territory of trust, reliability, calm, and professionalism. Industry data supports its strongest performance in finance, technology, healthcare categories, where the subdued saturation calibrates the message at a medium, considered level.
- 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: Capital One, PayPal, 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: Notion, Slack, 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: CVS Health, Mayo Clinic, Kaiser Permanente) Teal-blue works particularly well for health tech and telemedicine, balancing clinical trust with digital accessibility.
- Brand positioning: Cool 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, Cool Blue works effectively in corporate identity, banking and finance UIs, healthcare platforms—contexts where stability serves a secondary but reinforcing role.
For marketers and brand strategists, Cool Blue is a commitment to trust, reliability, calm, and professionalism. Match it with industries that make that promise and it will pay dividends consistently.
Accessibility & Design Guides
Frequently Asked Questions
- What is the hex code for Cool Blue? ▾
- The hex code for Cool Blue is #4F84C4. Its RGB values are rgb(79, 132, 196) and its HSL values are hsl(213, 50%, 54%).
- What does Cool 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. At medium lightness, it is the most versatile tone of this hue family — readable as text on light backgrounds, yet vibrant enough as a visual accent.
- Is Cool Blue WCAG accessible? ▾
- Cool Blue (#4F84C4) passes WCAG AA-large on white with a 3.87:1 contrast ratio. Its overall accessibility score is 39/100.
- What colors go well with Cool Blue? ▾
- Cool Blue pairs well with its complementary color Desert (#C19A6B). Analogous colors like Electric Blue and Sea Blue also work harmoniously. Check the Color Harmonies section above for the full palette.
- What is Cool Blue used for? ▾
- Cool 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 Cool Blue? ▾
- In CSS, use `color: #4F84C4` or `background-color: #4F84C4`. The CSS custom property is `--color-cool-blue: #4F84C4`. In Tailwind CSS, use the arbitrary value class `bg-[#4F84C4]` for backgrounds or `text-[#4F84C4]` for text.