#5178BA
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.112 260.4), rgb(81, 120, 186).
Aa
Black text reads best on this color (4.74:1).
About this color
#5178BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.112 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.025 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #5178BA |
| RGB | rgb(81, 120, 186) |
| HSL | hsl(218, 43%, 52%) |
| OKLCH | oklch(57.4% 0.112 260.4) |
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 #5178BA | 4.42:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #5178BA | 4.74:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #5178BA text on white | 4.42:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #5178BA text on black | 4.74:1 | AA | Lc -31.1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AEC2E2
oklch(81% 0.05 259.8)
-
Step 400
400
#84A2D3
oklch(70.8% 0.08 260.1)
-
Step 500
500
#658AC8
oklch(63.2% 0.103 260.4)
-
Step 600
600 (this color)
#5178BA
oklch(57.4% 0.112 260.4)
-
Step 700
700
#3D609B
oklch(49.1% 0.103 260.3)
-
Step 800
800
#334E7E
oklch(42.6% 0.087 261.2)
-
Step 900
900
#2C4165
oklch(37.6% 0.068 260.7)
-
Step 950
950
#1A273B
oklch(27.1% 0.042 258.8)
#5178BA 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) | #5D7DBD | 0.021 |
| Deuteranopia (no green cones) | #5073B9 | 0.014 |
| Tritanopia (no blue cones) | #048790 | 0.101 |
| Achromatopsia (no color) | #787878 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178BA
#5178BA
oklch(57.4% 0.112 260.4)
- #9A7016
#9A7016
oklch(57.3% 0.111 80.6)
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 #5178BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.025
- Steel Blue #4682B4 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.039
- Off Blue #5684AE ΔE 0.044
- French Blue #436BAD ΔE 0.044
- Dull Blue #49759C ΔE 0.048
- Nice Blue #107AB0 ΔE 0.049
Use #5178BA 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.