Tints & Shades
50
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Scale from white (50) through Ultramarine (500) to black (900), interpolated in Lab color space.
Color Values
- HEX
- #4166F5
- RGB
- rgb(65, 102, 245)
- HSL
- hsl(228, 90%, 61%)
- OKLCH
- oklch(0.57 0.218 268)
- CMYK
- cmyk(73%, 58%, 0%, 4%)
--color-ultramarinebg-[#4166F5]Accessibility
Score: 39/100On White (#FFF)
4.73:1
On Black (#000)
4.44:1
On Light Gray (#F5F5F5)
4.33:1
Best text color on this background:
Design Applications
background-color: #4166F5
color: #4166F5
bg-[#4166F5] text-[#FFFFFF]
border-left: 4px solid #4166F5
Color Harmonies
Complementary
Naples Yellow
#FADA5E
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 Ultramarine 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
Ultramarine is a dark color. Use white (#FFFFFF) text on top of it for maximum readability (4.73:1). Avoid small black text on this background.
CSS & Code Examples
Background
background-color: #4166F5;Text
color: #4166F5;Border
border: 2px solid #4166F5;Box Shadow
box-shadow: 0 4px 20px #4166F540;Gradient
background: linear-gradient(135deg, #4166F5, #8193ff);Tailwind-style
--color-ultramarine: #4166F5;Tailwind CSS Utilities
Use arbitrary value syntax in Tailwind CSS to apply Ultramarine without a custom config.
Background
bg-[#4166F5]Text
text-[#4166F5]Border
border-[#4166F5]Ring
ring-[#4166F5]Fill
fill-[#4166F5]From (gradient)
from-[#4166F5]Via (gradient)
via-[#4166F5]To (gradient)
to-[#4166F5]Design Tokens
Ready-to-use Ultramarine design token in CSS custom properties, SCSS, Tailwind v3/v4, and JSON formats.
CSS Custom Properties
:root {
--color-ultramarine: #4166F5;
--color-ultramarine-rgb: 65, 102, 245;
--color-ultramarine-hsl: 228, 90%, 61%;
}SCSS Variables
$color-ultramarine: #4166F5; $color-ultramarine-rgb: 65, 102, 245; $color-ultramarine-hsl: 228, 90%, 61%;
Tailwind v3 Config
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
'ultramarine': '#4166F5',
},
},
},
};Tailwind v4 (@theme)
/* tailwind.css */
@theme {
--color-ultramarine: #4166F5;
}JSON Design Token (W3C format)
{
"ultramarine": {
"value": "#4166F5",
"type": "color",
"description": "Ultramarine — #4166F5"
}
}More blue colors
View all →What Does Ultramarine Mean? Color Psychology & Cultural Symbolism
Ultramarine at #4166F5 is a mid-tone 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.
- Across color psychology research, blue consistently tests high for "trustworthiness" associations, making Ultramarine a reliable vehicle for trust in cross-demographic audiences.
- Brand designers draw on blue-family tones to project stability and competence—values that Ultramarine communicates in a mid-tone key.
- At 90% saturation, Ultramarine 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.
- Ultramarine's mid-tone lightness (61%) shifts its psychological register: a balanced mid-tone that embodies trust, reliability, calm, and professionalism at its most direct.
Ultramarine doesn't need to announce itself—it simply makes everything around it feel more reliable.
How to Use Ultramarine in Design: Applications, Pairings & Best Practices
Ultramarine 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.
- Avoid: food contexts where it suppresses appetite (the only major color with no natural blue foods), extreme urgency signals, and applications targeting very young children where warmer colors perform better.
- Color harmonies: Ultramarine's complementary color creates a high-energy split ideal for promotional design; its analogous palette (±30° hue) builds cohesive, monochromatic sophistication.
- Proportional use: Ultramarine's vivid saturation (90%) means small applications—accents, highlights, icons—deliver maximum impact without visual fatigue. Reserve large-scale use for intentional brand moments.
- As a dark tone, Ultramarine creates maximum contrast with white and light neutrals—excellent for creating premium dark-mode sections, bold headers, and high-drama brand moments
- Typography: Ultramarine works as a background behind white text but requires careful sizing—test at intended heading and body sizes before finalizing.
Ultramarine doesn't need to announce itself—it simply makes everything around it feel more reliable.
Ultramarine Accessibility: WCAG Contrast Ratios, Color Blindness & Inclusive Design
Ultramarine (#4166F5) reaches 4.73:1 contrast with white 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: 17.2%.
- As text on white (#FFFFFF): 4.73:1 — AA ✓
- As text on black (#000000): 4.44:1 — AA (large text only)
- Best text color on Ultramarine background: White (#FFFFFF) at 4.73:1
- WCAG 2.1 luminance: 17.2% — low luminance (dark)—it provides strong contrast for white and light overlaid text, functioning well as a background in dark-mode and header contexts
- Ultramarine 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.
Always verify Ultramarine 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.
Ultramarine in Industry: Branding, Design & Market Applications
Across industry research, blue-family tones consistently outperform competitors in categories built on trust, reliability, calm, and professionalism. Ultramarine is a mid-tone 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: 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: 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: Ultramarine 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, Ultramarine works effectively in corporate identity, banking and finance UIs, healthcare platforms—contexts where stability serves a secondary but reinforcing role.
Ultramarine 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 Ultramarine? ▾
- The hex code for Ultramarine is #4166F5. Its RGB values are rgb(65, 102, 245) and its HSL values are hsl(228, 90%, 61%).
- What does Ultramarine 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 Ultramarine WCAG accessible? ▾
- Ultramarine (#4166F5) passes WCAG AA on white with a 4.73:1 contrast ratio. Its overall accessibility score is 39/100.
- What colors go well with Ultramarine? ▾
- Ultramarine pairs well with its complementary color Naples Yellow (#FADA5E). Analogous colors like Sea Blue and Cool Blue also work harmoniously. Check the Color Harmonies section above for the full palette.
- What is Ultramarine used for? ▾
- Ultramarine 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 Ultramarine? ▾
- In CSS, use `color: #4166F5` or `background-color: #4166F5`. The CSS custom property is `--color-ultramarine: #4166F5`. In Tailwind CSS, use the arbitrary value class `bg-[#4166F5]` for backgrounds or `text-[#4166F5]` for text.