#5178A3
Closest named color: Stormy Blue (#507B9C). oklch(56.2% 0.08 251.7), rgb(81, 120, 163).
Aa
White text reads best on this color (4.59:1).
About this color
#5178A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.080 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.016 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.56:1 |
| White text | 4.59:1 |
Values
| HEX | #5178A3 |
| RGB | rgb(81, 120, 163) |
| HSL | hsl(211, 34%, 48%) |
| OKLCH | oklch(56.2% 0.08 251.7) |
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 #5178A3 | 4.59:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #5178A3 | 4.56:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #5178A3 text on white | 4.59:1 | AA | Lc 71.9 | Content text, not long reading |
| #5178A3 text on black | 4.56:1 | AA | Lc -29.8 | Dividers and decoration only |
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
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D8
oklch(80.9% 0.036 250.9)
-
Step 400
400
#87A4C4
oklch(70.8% 0.057 251.1)
-
Step 500
500
#688DB5
oklch(63.2% 0.073 251)
-
Step 600
600 (this color)
#5178A3
oklch(56.2% 0.08 251.7)
-
Step 700
700
#40638A
oklch(49% 0.075 252)
-
Step 800
800
#355170
oklch(42.7% 0.062 251.8)
-
Step 900
900
#2E435B
oklch(37.6% 0.049 252.4)
-
Step 950
950
#1B2735
oklch(26.8% 0.031 252.8)
#5178A3 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) | #677AA5 | 0.029 |
| Deuteranopia (no green cones) | #5D72A2 | 0.021 |
| Tritanopia (no blue cones) | #2A8287 | 0.070 |
| Achromatopsia (no color) | #757575 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178A3
#5178A3
oklch(56.2% 0.08 251.7)
- #926D3D
#926D3D
oklch(56.1% 0.08 72.1)
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 #5178A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.016
- Dull Blue #49759C ΔE 0.017
- Cerulean #457B9D ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.029
- Muted Blue #3B719F ΔE 0.033
- Metallic Blue #4F738E ΔE 0.033
- Steel Blue #4682B4 ΔE 0.034
- Off Blue #5684AE ΔE 0.036
Use #5178A3 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.