Indigo 8
indigo-8 · #3B5BDB
HEX
#3B5BDB
RGB
rgb(59, 91, 219)
CMYK
cmyk(73%, 58%, 0%, 14%)
HSL
hsl(228, 69%, 55%)
LAB
lab(43.5, 32.2, -68.8)
What is Indigo 8?
Indigo 8 is the indigo-8 reference in the Open Color. Its sRGB value is #3B5BDB (rgb 59, 91, 219). 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 8 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Indigo 8
An 11-step tonal scale derived from Indigo 8 (#3B5BDB). 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
#EFF2FC
#EFF2FC
100
#E0E5F9
#E0E5F9
200
#C0CBF3
#C0CBF3
300
#9DADED
#9DADED
400
#6C84E4
#6C84E4
500
#3B5BDB
#3B5BDB
600
#324DBA
#324DBA
700
#263B8E
#263B8E
800
#1B2963
#1B2963
900
#0F1737
#0F1737
950
#070B1A
#070B1A
Lighter tints (mixed with white)
15%
#7886E1
30%
#9CA4E7
45%
#B7BDEC
60%
#CED2F1
75%
#E2E4F7
Darker shades (mixed with black)
15%
#3654CC
30%
#314CBB
45%
#2B44A8
60%
#243A91
75%
#1B2D75
Color harmonies for Indigo 8
Classic color-theory harmonies derived from rotating the hue of Indigo 8. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#3B5BDB
#3B5BDB
#DBBC3D
#DBBC3D
Triadic
Three colors 120° apart
#3B5BDB
#3B5BDB
#DB3D5D
#DB3D5D
#5DDB3D
#5DDB3D
Analogous
Two neighbors ±30° on the wheel
#3DACDB
#3DACDB
#3B5BDB
#3B5BDB
#6D3DDB
#6D3DDB
Split-complementary
Base + two colors flanking its complement
#3B5BDB
#3B5BDB
#DB6D3D
#DB6D3D
#ACDB3D
#ACDB3D
Tetradic
Two complementary pairs
#3B5BDB
#3B5BDB
#BC3DDB
#BC3DDB
#DBBC3D
#DBBC3D
#5DDB3D
#5DDB3D
Square
Four colors evenly spaced 90° apart
#3B5BDB
#3B5BDB
#DB3DAC
#DB3DAC
#DBBC3D
#DBBC3D
#3DDB6D
#3DDB6D
Indigo 8 in every color space
Full conversion of Indigo 8 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
#3B5BDB
RGB
rgb(59, 91, 219)
CMYK
cmyk(73%, 58%, 0%, 14%)
HSL
hsl(228, 69%, 55%)
HSV
hsv(228, 73%, 86%)
HWB
hwb(228 23% 14%)
CIE Lab
lab(43.5 32.2 -68.8)
OKLCH
oklch(52.6% 0.199 268.0)
XYZ (D65)
xyz(18.33, 13.52, 68.65)
Copy-ready code for Indigo 8
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: #3B5BDB;
background-color: #3B5BDB;CSS variable
:root {
--color-indigo-8: #3B5BDB;
}Tailwind config
// tailwind.config.js
colors: {
'indigo-8': '#3B5BDB',
}Sass
$color-indigo-8: #3B5BDB;Swift UIColor
UIColor(red: 0.231, green: 0.357, blue: 0.859, alpha: 1.0)Android XML
<color name="indigo-8">#3B5BDB</color>Closest match in every color system
The nearest Indigo 8 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 5023
#49678D
Distant blue
RAL 5007
#3E5F8A
Brilliant blue
RAL 5015
#2271B3
Sky blue
RAL 5019
#1B5583
Capri blue
RAL 5014
#606E8C
Pigeon blue
RAL 5000
#354D73
Violet blue
FAQ about Indigo 8
What is the HEX code for Indigo 8?
Indigo 8 (indigo-8) has the HEX code #3B5BDB. In RGB it is rgb(59, 91, 219), and in CMYK it is cmyk(73%, 58%, 0%, 14%).
What is the OKLCH value of Indigo 8?
Indigo 8 converts to oklch(0.526 0.199 268.0). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Indigo 8 accessible for body text?
Used as a background, Indigo 8 has a contrast ratio of 3.71:1 with black text and 5.67:1 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 8?
The closest Pantone reference to Indigo 8 by ΔE2000 perceptual distance is Pantone 7455 C (#3A5DAE). 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 8?
The closest RAL Classic reference to Indigo 8 by ΔE2000 distance is RAL 5023 (Distant blue, #49678D). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Indigo 8?
The complementary color (180° opposite on the HSL color wheel) of Indigo 8 is #DBBC3D. 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.