Blue 1
blue-1 · #D0EBFF
HEX
#D0EBFF
RGB
rgb(208, 235, 255)
CMYK
cmyk(18%, 8%, 0%, 0%)
HSL
hsl(206, 100%, 91%)
LAB
lab(91.7, -4.8, -12.6)
What is Blue 1?
Blue 1 is the blue-1 reference in the Open Color. Its sRGB value is #D0EBFF (rgb 208, 235, 255). 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 Blue 1 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Blue 1
An 11-step tonal scale derived from Blue 1 (#D0EBFF). 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
#FBFDFF
#FBFDFF
100
#F7FCFF
#F7FCFF
200
#F0F9FF
#F0F9FF
300
#E8F5FF
#E8F5FF
400
#DCF0FF
#DCF0FF
500
#D0EBFF
#D0EBFF
600
#B1C8D9
#B1C8D9
700
#8799A6
#8799A6
800
#5E6A73
#5E6A73
900
#343B40
#343B40
950
#191C1F
#191C1F
Lighter tints (mixed with white)
15%
#D8EEFF
30%
#DFF1FF
45%
#E7F4FF
60%
#EEF7FF
75%
#F4FAFF
Darker shades (mixed with black)
15%
#C1DBED
30%
#B1C9DA
45%
#9FB4C4
60%
#8A9CAA
75%
#6F7E89
Color harmonies for Blue 1
Classic color-theory harmonies derived from rotating the hue of Blue 1. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#D0EBFF
#D0EBFF
#FFE5D1
#FFE5D1
Triadic
Three colors 120° apart
#D0EBFF
#D0EBFF
#FFD1EB
#FFD1EB
#EBFFD1
#EBFFD1
Analogous
Two neighbors ±30° on the wheel
#D1FFFC
#D1FFFC
#D0EBFF
#D0EBFF
#D1D4FF
#D1D4FF
Split-complementary
Base + two colors flanking its complement
#D0EBFF
#D0EBFF
#FFD1D4
#FFD1D4
#FFFCD1
#FFFCD1
Tetradic
Two complementary pairs
#D0EBFF
#D0EBFF
#E5D1FF
#E5D1FF
#FFE5D1
#FFE5D1
#EBFFD1
#EBFFD1
Square
Four colors evenly spaced 90° apart
#D0EBFF
#D0EBFF
#FCD1FF
#FCD1FF
#FFE5D1
#FFE5D1
#D4FFD1
#D4FFD1
Blue 1 in every color space
Full conversion of Blue 1 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
#D0EBFF
RGB
rgb(208, 235, 255)
CMYK
cmyk(18%, 8%, 0%, 0%)
HSL
hsl(206, 100%, 91%)
HSV
hsv(206, 18%, 100%)
HWB
hwb(206 82% 0%)
CIE Lab
lab(91.7 -4.8 -12.6)
OKLCH
oklch(92.7% 0.039 240.0)
XYZ (D65)
xyz(73.77, 80.04, 106.15)
Copy-ready code for Blue 1
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: #D0EBFF;
background-color: #D0EBFF;CSS variable
:root {
--color-blue-1: #D0EBFF;
}Tailwind config
// tailwind.config.js
colors: {
'blue-1': '#D0EBFF',
}Sass
$color-blue-1: #D0EBFF;Swift UIColor
UIColor(red: 0.816, green: 0.922, blue: 1.000, alpha: 1.0)Android XML
<color name="blue-1">#D0EBFF</color>Closest match in every color system
The nearest Blue 1 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 9003
#F4F4F4
Signal white
RAL 9016
#F6F6F6
Traffic white
RAL 7035
#D7D7D7
Light grey
RAL 9018
#D7D7D7
Papyrus white
RAL 9010
#FFFFFF
Pure white
RAL 9002
#E7EBDA
Grey white
FAQ about Blue 1
What is the HEX code for Blue 1?
Blue 1 (blue-1) has the HEX code #D0EBFF. In RGB it is rgb(208, 235, 255), and in CMYK it is cmyk(18%, 8%, 0%, 0%).
What is the OKLCH value of Blue 1?
Blue 1 converts to oklch(0.927 0.039 240.0). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Blue 1 accessible for body text?
Used as a background, Blue 1 has a contrast ratio of 17.01:1 with black text and 1.23:1 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 Blue 1?
The closest Pantone reference to Blue 1 by ΔE2000 perceptual distance is Pantone 290 C (#B9D9EB). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Blue 1?
The closest RAL Classic reference to Blue 1 by ΔE2000 distance is RAL 9003 (Signal white, #F4F4F4). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Blue 1?
The complementary color (180° opposite on the HSL color wheel) of Blue 1 is #FFE5D1. 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.