Indigo 9
indigo-9 · #364FC7
HEX
#364FC7
RGB
rgb(54, 79, 199)
CMYK
cmyk(73%, 60%, 0%, 22%)
HSL
hsl(230, 57%, 50%)
LAB
lab(38.7, 32.0, -65.2)
What is Indigo 9?
Indigo 9 is the indigo-9 reference in the Open Color. Its sRGB value is #364FC7 (rgb 54, 79, 199). It sits in the blue family. Open Color, an open-source color palette by Heeyeun designed for UI work. 13 hues across 10 shades (0 to 9) tuned for screen legibility and accessibility. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Indigo 9 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Indigo 9
An 11-step tonal scale derived from Indigo 9 (#364FC7). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#EFF1FB
#EFF1FB
100
#DFE3F6
#DFE3F6
200
#BFC7ED
#BFC7ED
300
#9BA7E3
#9BA7E3
400
#687BD5
#687BD5
500
#364FC7
#364FC7
600
#2E43A9
#2E43A9
700
#233381
#233381
800
#18245A
#18245A
900
#0E1432
#0E1432
950
#060918
#060918
Lighter tints (mixed with white)
15%
#7680D1
30%
#9BA1DA
45%
#B6BAE2
60%
#CED0EB
75%
#E2E3F3
Darker shades (mixed with black)
15%
#3249B9
30%
#2D42AA
45%
#273A98
60%
#203183
75%
#18266A
Color harmonies for Indigo 9
Classic color-theory harmonies derived from rotating the hue of Indigo 9. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#364FC7
#364FC7
#C8B037
#C8B037
Triadic
Three colors 120° apart
#364FC7
#364FC7
#C8374F
#C8374F
#4FC837
#4FC837
Analogous
Two neighbors ±30° on the wheel
#3798C8
#3798C8
#364FC7
#364FC7
#6737C8
#6737C8
Split-complementary
Base + two colors flanking its complement
#364FC7
#364FC7
#C86737
#C86737
#98C837
#98C837
Tetradic
Two complementary pairs
#364FC7
#364FC7
#B037C8
#B037C8
#C8B037
#C8B037
#4FC837
#4FC837
Square
Four colors evenly spaced 90° apart
#364FC7
#364FC7
#C83798
#C83798
#C8B037
#C8B037
#37C867
#37C867
Indigo 9 in every color space
Full conversion of Indigo 9 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#364FC7
RGB
rgb(54, 79, 199)
CMYK
cmyk(73%, 60%, 0%, 22%)
HSL
hsl(230, 57%, 50%)
HSV
hsv(230, 73%, 78%)
HWB
hwb(230 21% 22%)
CIE Lab
lab(38.7 32.0 -65.2)
OKLCH
oklch(48.4% 0.188 269.1)
XYZ (D65)
xyz(14.62, 10.50, 55.28)
Copy-ready code for Indigo 9
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #364FC7;
background-color: #364FC7;CSS variable
:root {
--color-indigo-9: #364FC7;
}Tailwind config
// tailwind.config.js
colors: {
'indigo-9': '#364FC7',
}Sass
$color-indigo-9: #364FC7;Swift UIColor
UIColor(red: 0.212, green: 0.310, blue: 0.780, alpha: 1.0)Android XML
<color name="indigo-9">#364FC7</color>Closest match in every color system
The nearest Indigo 9 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in Open Color
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 5007
#3E5F8A
Brilliant blue
RAL 5023
#49678D
Distant blue
RAL 5019
#1B5583
Capri blue
RAL 5000
#354D73
Violet blue
RAL 5017
#063971
Traffic blue
RAL 5015
#2271B3
Sky blue
FAQ about Indigo 9
What is the HEX code for Indigo 9?
Indigo 9 (indigo-9) has the HEX code #364FC7. In RGB it is rgb(54, 79, 199), and in CMYK it is cmyk(73%, 60%, 0%, 22%).
What is the OKLCH value of Indigo 9?
Indigo 9 converts to oklch(0.484 0.188 269.1). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Indigo 9 accessible for body text?
Used as a background, Indigo 9 has a contrast ratio of 3.10:1 with black text and 6.77:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use white text and verify in real UI context.
What is the closest Pantone to Indigo 9?
The closest Pantone reference to Indigo 9 by ΔE2000 perceptual distance is Pantone 2728 C (#0047BB). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Indigo 9?
The closest RAL Classic reference to Indigo 9 by ΔE2000 distance is RAL 5007 (Brilliant blue, #3E5F8A). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Indigo 9?
The complementary color (180° opposite on the HSL color wheel) of Indigo 9 is #C8B037. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
Open Color (Yeun)
Open Color, an open-source color palette by Heeyeun designed for UI designers and developers. 13 hues across 10 shades. Use as a designer-friendly palette alternative to Tailwind. Values are intentionally chosen for UI legibility and accessibility.
- Source type
- derived
- Confidence
- high
- License
- MIT
- Last reviewed
- 2026-05-24
Workflow tags
Open Color values are tuned for digital UI. For print, treat as a starting point and proof against the substrate.