Tints & Shades
50
100
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800
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Scale from white (50) through Phthalo Blue (500) to black (900), interpolated in Lab color space.
Color Values
- HEX
- #000F89
- RGB
- rgb(0, 15, 137)
- HSL
- hsl(233, 100%, 27%)
- OKLCH
- oklch(0.297 0.189 264)
- CMYK
- cmyk(100%, 89%, 0%, 46%)
--color-phthalo-bluebg-[#000F89]Accessibility
Score: 96/100On White (#FFF)
14.69:1
On Black (#000)
1.43:1
On Light Gray (#F5F5F5)
13.47:1
Best text color on this background:
Design Applications
background-color: #000F89
color: #000F89
bg-[#000F89] text-[#FFFFFF]
border-left: 4px solid #000F89
Color Harmonies
Complementary
Khaki
#F0E68C
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 Phthalo 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
Phthalo Blue is a dark color. Use white (#FFFFFF) text on top of it for maximum readability (14.69:1). Avoid small black text on this background.
CSS & Code Examples
Background
background-color: #000F89;Text
color: #000F89;Border
border: 2px solid #000F89;Box Shadow
box-shadow: 0 4px 20px #000F8940;Gradient
background: linear-gradient(135deg, #000F89, #4e39ba);Tailwind-style
--color-phthalo-blue: #000F89;Tailwind CSS Utilities
Use arbitrary value syntax in Tailwind CSS to apply Phthalo Blue without a custom config.
Background
bg-[#000F89]Text
text-[#000F89]Border
border-[#000F89]Ring
ring-[#000F89]Fill
fill-[#000F89]From (gradient)
from-[#000F89]Via (gradient)
via-[#000F89]To (gradient)
to-[#000F89]Design Tokens
Ready-to-use Phthalo Blue design token in CSS custom properties, SCSS, Tailwind v3/v4, and JSON formats.
CSS Custom Properties
:root {
--color-phthalo-blue: #000F89;
--color-phthalo-blue-rgb: 0, 15, 137;
--color-phthalo-blue-hsl: 233, 100%, 27%;
}SCSS Variables
$color-phthalo-blue: #000F89; $color-phthalo-blue-rgb: 0, 15, 137; $color-phthalo-blue-hsl: 233, 100%, 27%;
Tailwind v3 Config
// tailwind.config.js
module.exports = {
theme: {
extend: {
colors: {
'phthalo-blue': '#000F89',
},
},
},
};Tailwind v4 (@theme)
/* tailwind.css */
@theme {
--color-phthalo-blue: #000F89;
}JSON Design Token (W3C format)
{
"phthalo-blue": {
"value": "#000F89",
"type": "color",
"description": "Phthalo Blue — #000F89"
}
}More blue colors
View all →What Does Phthalo 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. Phthalo 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).
- Phthalo Blue's deep lightness (27%) 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, Phthalo 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, Phthalo Blue earns attention through steadiness. Use it where you need to be believed.
How to Use Phthalo Blue in Design: Applications, Pairings & Best Practices
Phthalo Blue's accessibility profile makes it one of the more designer-friendly choices in the warm-cool spectrum. Its deep quality at 27% lightness typically produces workable contrast ratios for both text and UI applications.
- UI components: primary brand color, link color, interactive states—Phthalo Blue performs reliably in all these roles with its deep tonal character.
- Brand & identity: corporate identity, banking and finance UIs, healthcare platforms—contexts where Phthalo Blue's vivid quality creates the right register.
- Typography: Phthalo 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, Phthalo 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: Phthalo 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, Phthalo Blue earns attention through steadiness. Use it where you need to be believed.
Phthalo Blue Accessibility: WCAG Contrast Ratios, Color Blindness & Inclusive Design
Phthalo Blue (#000F89) achieves a 14.69:1 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: 2.1%.
- As text on white (#FFFFFF): 14.69:1 — AAA ✓
- As text on black (#000000): 1.43:1 — Fail
- Best text color on Phthalo Blue background: White (#FFFFFF) at 14.69:1
- WCAG 2.1 luminance: 2.1% — low luminance (dark)—it provides strong contrast for white and light overlaid text, functioning well as a background in dark-mode and header contexts
- Phthalo 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.
Phthalo Blue's WCAG profile makes it a compliant choice for most text applications.
Phthalo Blue in Industry: Branding, Design & Market Applications
Phthalo Blue (#000F89) 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 professionalism 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: CVS Health, Mayo Clinic, Kaiser Permanente) Teal-blue works particularly well for health tech and telemedicine, balancing clinical trust with digital accessibility.
- Brand positioning: Phthalo 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, Phthalo Blue works effectively in corporate identity, banking and finance UIs, healthcare platforms—contexts where professionalism serves a secondary but reinforcing role.
The industries where Phthalo Blue performs best are those where the audience expects professionalism. Build brand strategy around this alignment, not against it.
Accessibility & Design Guides
Frequently Asked Questions
- What is the hex code for Phthalo Blue? ▾
- The hex code for Phthalo Blue is #000F89. Its RGB values are rgb(0, 15, 137) and its HSL values are hsl(233, 100%, 27%).
- What does Phthalo 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 Phthalo Blue WCAG accessible? ▾
- Phthalo Blue (#000F89) passes WCAG AAA on white with a 14.69:1 contrast ratio. Its overall accessibility score is 96/100.
- What colors go well with Phthalo Blue? ▾
- Phthalo Blue pairs well with its complementary color Khaki (#F0E68C). Analogous colors like Indigo Dye and Cornflower Blue also work harmoniously. Check the Color Harmonies section above for the full palette.
- What is Phthalo Blue used for? ▾
- Phthalo 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 Phthalo Blue? ▾
- In CSS, use `color: #000F89` or `background-color: #000F89`. The CSS custom property is `--color-phthalo-blue: #000F89`. In Tailwind CSS, use the arbitrary value class `bg-[#000F89]` for backgrounds or `text-[#000F89]` for text.