Tints & Shades
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Scale from white (50) through Deep Sky Blue (500) to black (900), interpolated in Lab color space.
Color Values
- HEX
- #00BFFF
- RGB
- rgb(0, 191, 255)
- HSL
- hsl(195, 100%, 50%)
- OKLCH
- oklch(0.755 0.153 232)
- CMYK
- cmyk(100%, 25%, 0%, 0%)
--color-deepskybluebg-[#00BFFF]Accessibility
Score: 48/100On White (#FFF)
2.12:1
On Black (#000)
9.9:1
On Light Gray (#F5F5F5)
1.95:1
Best text color on this background:
Design Applications
background-color: #00BFFF
color: #00BFFF
bg-[#00BFFF] text-[#000000]
border-left: 4px solid #00BFFF
Color Harmonies
Complementary
Papaya
#FF9470
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 Deep Sky 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
Fails AA Large
3:1 minimum required
UI Components
Check contrast
3:1 for non-text UI
Deep Sky Blue is a light color. Use black (#000000) text on top of it for maximum readability (9.90:1). Avoid white text on this background.
CSS & Code Examples
Background
background-color: #00BFFF;Text
color: #00BFFF;Border
border: 2px solid #00BFFF;Box Shadow
box-shadow: 0 4px 20px #00BFFF40;Gradient
background: linear-gradient(135deg, #00BFFF, #6af2ff);Tailwind-style
--color-deep-sky-blue: #00BFFF;Tailwind CSS Utilities
Use arbitrary value syntax in Tailwind CSS to apply Deep Sky Blue without a custom config.
Background
bg-[#00BFFF]Text
text-[#00BFFF]Border
border-[#00BFFF]Ring
ring-[#00BFFF]Fill
fill-[#00BFFF]From (gradient)
from-[#00BFFF]Via (gradient)
via-[#00BFFF]To (gradient)
to-[#00BFFF]Design Tokens
Ready-to-use Deep Sky Blue design token in CSS custom properties, SCSS, Tailwind v3/v4, and JSON formats.
CSS Custom Properties
:root {
--color-deepskyblue: #00BFFF;
--color-deepskyblue-rgb: 0, 191, 255;
--color-deepskyblue-hsl: 195, 100%, 50%;
}SCSS Variables
$color-deepskyblue: #00BFFF; $color-deepskyblue-rgb: 0, 191, 255; $color-deepskyblue-hsl: 195, 100%, 50%;
Tailwind v3 Config
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
'deepskyblue': '#00BFFF',
},
},
},
};Tailwind v4 (@theme)
/* tailwind.css */
@theme {
--color-deepskyblue: #00BFFF;
}JSON Design Token (W3C format)
{
"deepskyblue": {
"value": "#00BFFF",
"type": "color",
"description": "Deep Sky Blue — #00BFFF"
}
}More blue colors
View all →What Does Deep Sky Blue Mean? Color Psychology & Cultural Symbolism
Evolutionary color psychology suggests blue's dominance traces to the sky and clean water—stable, expansive environments our ancestors associated with safety and resources. Deep Sky Blue carries this ancient signal into contemporary design as stability, doing perceptual work before a single word is read.
- 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).
- Deep Sky Blue's medium lightness (50%) shifts its psychological register: a balanced mid-tone that embodies trust, reliability, calm, and professionalism at its most direct.
- At 100% saturation, Deep Sky 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.
Deep Sky Blue doesn't need to announce itself—it simply makes everything around it feel more reliable.
How to Use Deep Sky Blue in Design: Applications, Pairings & Best Practices
Deep Sky Blue is a workhorse color in design systems—reliable in both semantic (interactive, informational) and aesthetic (trusted, professional) roles. Its vivid saturation means it performs across both digital and print contexts without fatigue.
- UI components: primary brand color, link color, interactive states—Deep Sky Blue performs reliably in all these roles with its medium tonal character.
- Brand & identity: corporate identity, banking and finance UIs, healthcare platforms—contexts where Deep Sky Blue's vivid quality creates the right register.
- Typography: Deep Sky Blue as text requires a dark background; its 50% lightness means it provides 2.1:1 contrast on white, not meeting WCAG AA.
- Deep Sky Blue creates strong legibility with black text overlays (9.9:1 contrast ratio), making it a reliable background or surface color in design systems
- Proportional use: Deep Sky 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.
Deep Sky Blue doesn't need to announce itself—it simply makes everything around it feel more reliable.
Deep Sky Blue Accessibility: WCAG Contrast Ratios, Color Blindness & Inclusive Design
Deep Sky Blue (#00BFFF) achieves a 9.90:1 contrast ratio with black 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: 44.5%.
- As text on white (#FFFFFF): 2.12:1 — Fail
- As text on black (#000000): 9.90:1 — AAA ✓
- Best text color on Deep Sky Blue background: Black (#000000) at 9.90:1
- WCAG 2.1 luminance: 44.5% — above-median luminance—it reads as a light to mid-tone background, compatible with dark text while retaining color personality
- Deep Sky 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.
Always verify Deep Sky Blue at its final intended size and weight using a real contrast checker—font weight and rendering environment affect perceived legibility beyond what raw ratios capture.
Deep Sky Blue in Industry: Branding, Design & Market Applications
Across industry research, blue-family tones consistently outperform competitors in categories built on trust, reliability, calm, and professionalism. Deep Sky Blue is a medium expression of this advantage—best positioned in Finance & Banking and adjacent markets.
- 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: 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: Deep Sky Blue is best suited for brands projecting stability, competence, 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, Deep Sky Blue works effectively in trust-critical applications, government services, B2B software—contexts where professionalism serves a secondary but reinforcing role.
Deep Sky Blue earns its strongest ROI in industries where trust and recognition compound over time: Finance & Banking, Technology, Healthcare. Use it to build the kind of brand recognition that decades reinforce.
Accessibility & Design Guides
Frequently Asked Questions
- What is the hex code for Deep Sky Blue? ▾
- The hex code for Deep Sky Blue is #00BFFF. Its RGB values are rgb(0, 191, 255) and its HSL values are hsl(195, 100%, 50%).
- What does Deep Sky 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 Deep Sky Blue WCAG accessible? ▾
- Deep Sky Blue (#00BFFF) does not pass WCAG AA on white (2.12:1 ratio). Use it on dark backgrounds where it achieves 9.9:1. Its overall accessibility score is 48/100.
- What colors go well with Deep Sky Blue? ▾
- Deep Sky Blue pairs well with its complementary color Papaya (#FF9470). Analogous colors like Opal and Iron Gray also work harmoniously. Check the Color Harmonies section above for the full palette.
- What is Deep Sky Blue used for? ▾
- Deep Sky 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 Deep Sky Blue? ▾
- In CSS, use `color: #00BFFF` or `background-color: #00BFFF`. The CSS custom property is `--color-deepskyblue: #00BFFF`. In Tailwind CSS, use the arbitrary value class `bg-[#00BFFF]` for backgrounds or `text-[#00BFFF]` for text.