Blue2
blue2 · #0000EE
HEX
#0000EE
RGB
rgb(0, 0, 238)
CMYK
cmyk(100%, 100%, 0%, 7%)
HSL
hsl(240, 100%, 47%)
LAB
lab(29.8, 75.2, -102.4)
What is Blue2?
Blue2 is the blue2 reference in the X11 named colors. Its sRGB value is #0000EE (rgb 0, 0, 238). It sits in the blue family. Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Blue2 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Blue2
An 11-step tonal scale derived from Blue2 (#0000EE). 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
#EBEBFE
#EBEBFE
100
#D6D6FC
#D6D6FC
200
#ADADFA
#ADADFA
300
#8080F7
#8080F7
400
#4040F2
#4040F2
500
#0000EE
#0000EE
600
#0000CA
#0000CA
700
#00009B
#00009B
800
#00006B
#00006B
900
#00003C
#00003C
950
#00001D
#00001D
Lighter tints (mixed with white)
15%
#6C6CF1
30%
#9595F3
45%
#B3B3F6
60%
#CBCBF8
75%
#E1E1FB
Darker shades (mixed with black)
15%
#0000DD
30%
#0000CB
45%
#0000B6
60%
#00009E
75%
#00007F
Color harmonies for Blue2
Classic color-theory harmonies derived from rotating the hue of Blue2. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#0000EE
#0000EE
#F0F000
#F0F000
Triadic
Three colors 120° apart
#0000EE
#0000EE
#F00000
#F00000
#00F000
#00F000
Analogous
Two neighbors ±30° on the wheel
#0078F0
#0078F0
#0000EE
#0000EE
#7800F0
#7800F0
Split-complementary
Base + two colors flanking its complement
#0000EE
#0000EE
#F07800
#F07800
#78F000
#78F000
Tetradic
Two complementary pairs
#0000EE
#0000EE
#F000F0
#F000F0
#F0F000
#F0F000
#00F000
#00F000
Square
Four colors evenly spaced 90° apart
#0000EE
#0000EE
#F00078
#F00078
#F0F000
#F0F000
#00F078
#00F078
Blue2 in every color space
Full conversion of Blue2 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
#0000EE
RGB
rgb(0, 0, 238)
CMYK
cmyk(100%, 100%, 0%, 7%)
HSL
hsl(240, 100%, 47%)
HSV
hsv(240, 100%, 93%)
HWB
hwb(240 0% 7%)
CIE Lab
lab(29.8 75.2 -102.4)
OKLCH
oklch(42.9% 0.297 264.1)
XYZ (D65)
xyz(15.43, 6.17, 81.25)
Copy-ready code for Blue2
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: #0000EE;
background-color: #0000EE;CSS variable
:root {
--color-blue2: #0000EE;
}Tailwind config
// tailwind.config.js
colors: {
'blue2': '#0000EE',
}Sass
$color-blue2: #0000EE;Swift UIColor
UIColor(red: 0.000, green: 0.000, blue: 0.933, alpha: 1.0)Android XML
<color name="blue2">#0000EE</color>Closest match in every color system
The nearest Blue2 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 X11 named colors
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 5017
#063971
Traffic blue
RAL 5020
#1D334A
Ocean blue
RAL 5000
#354D73
Violet blue
RAL 5005
#1E2460
Signal blue
RAL 5019
#1B5583
Capri blue
RAL 5007
#3E5F8A
Brilliant blue
FAQ about Blue2
What is the HEX code for Blue2?
Blue2 (blue2) has the HEX code #0000EE. In RGB it is rgb(0, 0, 238), and in CMYK it is cmyk(100%, 100%, 0%, 7%).
What is the OKLCH value of Blue2?
Blue2 converts to oklch(0.429 0.297 264.1). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Blue2 accessible for body text?
Used as a background, Blue2 has a contrast ratio of 2.23:1 with black text and 9.40:1 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 Blue2?
The closest Pantone reference to Blue2 by ΔE2000 perceptual distance is Pantone Blue 072 C (#10069F). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Blue2?
The closest RAL Classic reference to Blue2 by ΔE2000 distance is RAL 5017 (Traffic blue, #063971). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Blue2?
The complementary color (180° opposite on the HSL color wheel) of Blue2 is #F0F000. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
X11 named colors (xorg rgb.txt)
The historical X11 color name list shipped in the xorg-server rgb.txt file. Roughly 550 entries covering classic computing color names like 'PapayaWhip', 'MediumAquamarine', and 'DarkSlateGray'. Many CSS named colors originate here. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
- Source type
- derived
- Confidence
- high
- License
- MIT/X11 license (X Consortium)
- Last reviewed
- 2026-05-24
Workflow tags
X11 colors are sRGB digital values from a 1980s color system. For print, convert to a process-appropriate color and proof against substrate.