#5179CC
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.135 263.4), rgb(81, 121, 204).
Aa
Black text reads best on this color (4.95:1).
About this color
#5179CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.135 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #5179CC |
| RGB | rgb(81, 121, 204) |
| HSL | hsl(220, 55%, 56%) |
| OKLCH | oklch(58.6% 0.135 263.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5179CC | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #5179CC | 4.95:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #5179CC text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #5179CC text on black | 4.95:1 | AA | Lc -32.6 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ACC1E9
oklch(80.9% 0.061 263.2)
-
Step 400
400
#81A0DE
oklch(70.7% 0.098 263.6)
-
Step 500
500
#6187D5
oklch(63% 0.126 263.5)
-
Step 600
600 (this color)
#5179CC
oklch(58.6% 0.135 263.4)
-
Step 700
700
#3A5DA7
oklch(49.1% 0.125 263.4)
-
Step 800
800
#304C88
oklch(42.6% 0.105 263.7)
-
Step 900
900
#2A406D
oklch(37.7% 0.082 263.3)
-
Step 950
950
#192640
oklch(27.1% 0.052 263.2)
#5179CC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5581CF | 0.023 |
| Deuteranopia (no green cones) | #4476CA | 0.017 |
| Tritanopia (no blue cones) | #008C98 | 0.118 |
| Achromatopsia (no color) | #7B7B7B | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5179CC
#5179CC
oklch(58.6% 0.135 263.4)
- #9E7400
#9E7400
oklch(58.5% 0.12 83.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5179CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Cool Blue #4984B8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.051
- Water Blue #0E87CC ΔE 0.051
- Royal Blue #4169E1 ΔE 0.060
- Dark Sky Blue #448EE4 ΔE 0.060
- French Blue #436BAD ΔE 0.061
- Off Blue #5684AE ΔE 0.062
Use #5179CC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.