Blue 5
blue-5 · #339AF0
HEX
#339AF0
RGB
rgb(51, 154, 240)
CMYK
cmyk(79%, 36%, 0%, 6%)
HSL
hsl(207, 86%, 57%)
LAB
lab(61.7, 0.1, -51.4)
What is Blue 5?
Blue 5 is the blue-5 reference in the Open Color. Its sRGB value is #339AF0 (rgb 51, 154, 240). 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 5 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Blue 5
An 11-step tonal scale derived from Blue 5 (#339AF0). 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
#EFF7FE
#EFF7FE
100
#DEEFFD
#DEEFFD
200
#BEDFFA
#BEDFFA
300
#99CDF8
#99CDF8
400
#66B3F4
#66B3F4
500
#339AF0
#339AF0
600
#2B83CC
#2B83CC
700
#21649C
#21649C
800
#17456C
#17456C
900
#0D273C
#0D273C
950
#06121D
#06121D
Lighter tints (mixed with white)
15%
#75AEF2
30%
#9AC0F5
45%
#B6D0F7
60%
#CDDEF9
75%
#E2EBFB
Darker shades (mixed with black)
15%
#2F8FDF
30%
#2A83CD
45%
#2575B8
60%
#1E659F
75%
#165081
Color harmonies for Blue 5
Classic color-theory harmonies derived from rotating the hue of Blue 5. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#339AF0
#339AF0
#F08833
#F08833
Triadic
Three colors 120° apart
#339AF0
#339AF0
#F0339B
#F0339B
#9BF033
#9BF033
Analogous
Two neighbors ±30° on the wheel
#33F0E6
#33F0E6
#339AF0
#339AF0
#333CF0
#333CF0
Split-complementary
Base + two colors flanking its complement
#339AF0
#339AF0
#F0333C
#F0333C
#F0E633
#F0E633
Tetradic
Two complementary pairs
#339AF0
#339AF0
#8833F0
#8833F0
#F08833
#F08833
#9BF033
#9BF033
Square
Four colors evenly spaced 90° apart
#339AF0
#339AF0
#E633F0
#E633F0
#F08833
#F08833
#3CF033
#3CF033
Blue 5 in every color space
Full conversion of Blue 5 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
#339AF0
RGB
rgb(51, 154, 240)
CMYK
cmyk(79%, 36%, 0%, 6%)
HSL
hsl(207, 86%, 57%)
HSV
hsv(207, 79%, 94%)
HWB
hwb(207 20% 6%)
CIE Lab
lab(61.7 0.1 -51.4)
OKLCH
oklch(66.9% 0.157 248.3)
XYZ (D65)
xyz(28.64, 30.10, 86.72)
Copy-ready code for Blue 5
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: #339AF0;
background-color: #339AF0;CSS variable
:root {
--color-blue-5: #339AF0;
}Tailwind config
// tailwind.config.js
colors: {
'blue-5': '#339AF0',
}Sass
$color-blue-5: #339AF0;Swift UIColor
UIColor(red: 0.200, green: 0.604, blue: 0.941, alpha: 1.0)Android XML
<color name="blue-5">#339AF0</color>Closest match in every color system
The nearest Blue 5 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 5015
#2271B3
Sky blue
RAL 7000
#7E8B92
Squirrel grey
RAL 7001
#8F999F
Silver grey
RAL 5023
#49678D
Distant blue
RAL 5014
#606E8C
Pigeon blue
FAQ about Blue 5
What is the HEX code for Blue 5?
Blue 5 (blue-5) has the HEX code #339AF0. In RGB it is rgb(51, 154, 240), and in CMYK it is cmyk(79%, 36%, 0%, 6%).
What is the OKLCH value of Blue 5?
Blue 5 converts to oklch(0.669 0.157 248.3). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Blue 5 accessible for body text?
Used as a background, Blue 5 has a contrast ratio of 7.02:1 with black text and 2.99:1 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 5?
The closest Pantone reference to Blue 5 by ΔE2000 perceptual distance is Pantone Process Cyan C (#009DDC). 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 5?
The closest RAL Classic reference to Blue 5 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 Blue 5?
The complementary color (180° opposite on the HSL color wheel) of Blue 5 is #F08833. 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.