#5178AC
Closest named color: Dull Blue (#49759C). oklch(56.6% 0.092 255.9), rgb(81, 120, 172).
Aa
Black text reads best on this color (4.63:1).
About this color
#5178AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.092 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.028 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #5178AC |
| RGB | rgb(81, 120, 172) |
| HSL | hsl(214, 36%, 50%) |
| OKLCH | oklch(56.6% 0.092 255.9) |
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 #5178AC | 4.53:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #5178AC | 4.63:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #5178AC text on white | 4.53:1 | AA | Lc 71.4 | Content text, not long reading |
| #5178AC text on black | 4.63:1 | AA | Lc -30.3 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC2DC
oklch(80.8% 0.042 256.3)
-
Step 400
400
#86A3CA
oklch(70.8% 0.066 255.9)
-
Step 500
500
#678CBC
oklch(63.2% 0.084 255.2)
-
Step 600
600 (this color)
#5178AC
oklch(56.6% 0.092 255.9)
-
Step 700
700
#3F6291
oklch(49.1% 0.086 256.1)
-
Step 800
800
#345075
oklch(42.6% 0.071 255.8)
-
Step 900
900
#2E435F
oklch(37.8% 0.055 255.9)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#5178AC 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) | #637BAE | 0.025 |
| Deuteranopia (no green cones) | #5872AB | 0.018 |
| Tritanopia (no blue cones) | #21848A | 0.083 |
| Achromatopsia (no color) | #767676 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178AC
#5178AC
oklch(56.6% 0.092 255.9)
- #956E31
#956E31
oklch(56.5% 0.092 76)
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 #5178AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.028
- Stormy Blue #507B9C ΔE 0.029
- Cerulean #457B9D ΔE 0.031
- Cool Blue #4984B8 ΔE 0.034
- Off Blue #5684AE ΔE 0.035
- Windows Blue #3778BF ΔE 0.037
Use #5178AC 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.