Indigo 4
indigo-4 · #748FFC
HEX
#748FFC
RGB
rgb(116, 143, 252)
CMYK
cmyk(54%, 43%, 0%, 1%)
HSL
hsl(228, 96%, 72%)
LAB
lab(62.0, 20.8, -57.4)
What is Indigo 4?
Indigo 4 is the indigo-4 reference in the Open Color. Its sRGB value is #748FFC (rgb 116, 143, 252). 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 4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Indigo 4
An 11-step tonal scale derived from Indigo 4 (#748FFC). 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
#F4F6FF
#F4F6FF
100
#E9EDFF
#E9EDFF
200
#D3DBFE
#D3DBFE
300
#BAC7FE
#BAC7FE
400
#97ABFD
#97ABFD
500
#748FFC
#748FFC
600
#637AD6
#637AD6
700
#4B5DA4
#4B5DA4
800
#344071
#344071
900
#1D243F
#1D243F
950
#0E111E
#0E111E
Lighter tints (mixed with white)
15%
#95A6FC
30%
#AEBAFD
45%
#C3CCFD
60%
#D6DBFE
75%
#E6E9FE
Darker shades (mixed with black)
15%
#6B85EB
30%
#6279D7
45%
#576CC1
60%
#4B5DA8
75%
#3B4A87
Color harmonies for Indigo 4
Classic color-theory harmonies derived from rotating the hue of Indigo 4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#748FFC
#748FFC
#FCE173
#FCE173
Triadic
Three colors 120° apart
#748FFC
#748FFC
#FC738E
#FC738E
#8EFC73
#8EFC73
Analogous
Two neighbors ±30° on the wheel
#73D3FC
#73D3FC
#748FFC
#748FFC
#9C73FC
#9C73FC
Split-complementary
Base + two colors flanking its complement
#748FFC
#748FFC
#FC9C73
#FC9C73
#D3FC73
#D3FC73
Tetradic
Two complementary pairs
#748FFC
#748FFC
#E173FC
#E173FC
#FCE173
#FCE173
#8EFC73
#8EFC73
Square
Four colors evenly spaced 90° apart
#748FFC
#748FFC
#FC73D3
#FC73D3
#FCE173
#FCE173
#73FC9C
#73FC9C
Indigo 4 in every color space
Full conversion of Indigo 4 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
#748FFC
RGB
rgb(116, 143, 252)
CMYK
cmyk(54%, 43%, 0%, 1%)
HSL
hsl(228, 96%, 72%)
HSV
hsv(228, 54%, 99%)
HWB
hwb(228 45% 1%)
CIE Lab
lab(62.0 20.8 -57.4)
OKLCH
oklch(68.0% 0.163 271.0)
XYZ (D65)
xyz(34.59, 30.38, 96.12)
Copy-ready code for Indigo 4
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: #748FFC;
background-color: #748FFC;CSS variable
:root {
--color-indigo-4: #748FFC;
}Tailwind config
// tailwind.config.js
colors: {
'indigo-4': '#748FFC',
}Sass
$color-indigo-4: #748FFC;Swift UIColor
UIColor(red: 0.455, green: 0.561, blue: 0.988, alpha: 1.0)Android XML
<color name="indigo-4">#748FFC</color>Closest match in every color system
The nearest Indigo 4 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 5012
#3B83BD
Light blue
RAL 7000
#7E8B92
Squirrel grey
RAL 7001
#8F999F
Silver grey
RAL 5015
#2271B3
Sky blue
RAL 5014
#606E8C
Pigeon blue
RAL 7040
#9DA1AA
Window grey
FAQ about Indigo 4
What is the HEX code for Indigo 4?
Indigo 4 (indigo-4) has the HEX code #748FFC. In RGB it is rgb(116, 143, 252), and in CMYK it is cmyk(54%, 43%, 0%, 1%).
What is the OKLCH value of Indigo 4?
Indigo 4 converts to oklch(0.680 0.163 271.0). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Indigo 4 accessible for body text?
Used as a background, Indigo 4 has a contrast ratio of 7.08:1 with black text and 2.97:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use black text and verify in real UI context.
What is the closest Pantone to Indigo 4?
The closest Pantone reference to Indigo 4 by ΔE2000 perceptual distance is Pantone 284 C (#6CACE4). 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 4?
The closest RAL Classic reference to Indigo 4 by ΔE2000 distance is RAL 5012 (Light blue, #3B83BD). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Indigo 4?
The complementary color (180° opposite on the HSL color wheel) of Indigo 4 is #FCE173. 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.