#5178B7
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.107 259.6), rgb(81, 120, 183).
Aa
Black text reads best on this color (4.72:1).
About this color
#5178B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.107 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #5178B7 |
| RGB | rgb(81, 120, 183) |
| HSL | hsl(217, 41%, 52%) |
| OKLCH | oklch(57.2% 0.107 259.6) |
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 #5178B7 | 4.44:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #5178B7 | 4.72:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #5178B7 text on white | 4.44:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #5178B7 text on black | 4.72:1 | AA | Lc -30.9 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2E0
oklch(80.9% 0.047 259.5)
-
Step 400
400
#84A2D1
oklch(70.7% 0.077 259.2)
-
Step 500
500
#658AC5
oklch(63.1% 0.099 259.5)
-
Step 600
600 (this color)
#5178B7
oklch(57.2% 0.107 259.6)
-
Step 700
700
#3D6099
oklch(49% 0.101 259.7)
-
Step 800
800
#334F7C
oklch(42.7% 0.083 259.5)
-
Step 900
900
#2D4264
oklch(37.8% 0.064 259.7)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#5178B7 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) | #5F7DBA | 0.023 |
| Deuteranopia (no green cones) | #5273B6 | 0.014 |
| Tritanopia (no blue cones) | #0E868F | 0.096 |
| Achromatopsia (no color) | #777777 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178B7
#5178B7
oklch(57.2% 0.107 259.6)
- #99701E
#99701E
oklch(57.2% 0.107 80)
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 #5178B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Steel Blue #4682B4 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.036
- Off Blue #5684AE ΔE 0.041
- French Blue #436BAD ΔE 0.043
- Dull Blue #49759C ΔE 0.044
- Stormy Blue #507B9C ΔE 0.046
Use #5178B7 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.