#5178A4
Closest named color: Stormy Blue (#507B9C). oklch(56.2% 0.082 252.2), rgb(81, 120, 164).
Aa
White text reads best on this color (4.59:1).
About this color
#5178A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.082 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.017 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.57:1 |
| White text | 4.59:1 |
Values
| HEX | #5178A4 |
| RGB | rgb(81, 120, 164) |
| HSL | hsl(212, 34%, 48%) |
| OKLCH | oklch(56.2% 0.082 252.2) |
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 #5178A4 | 4.59:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #5178A4 | 4.57:1 | AA | Lc 32.3 | Non-text elements, placeholder text |
| #5178A4 text on white | 4.59:1 | AA | Lc 71.8 | Content text, not long reading |
| #5178A4 text on black | 4.57:1 | AA | Lc -29.9 | 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
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B0C3D8
oklch(80.9% 0.036 250.9)
-
Step 400
400
#86A3C5
oklch(70.6% 0.06 252.7)
-
Step 500
500
#688DB6
oklch(63.2% 0.075 251.6)
-
Step 600
600 (this color)
#5178A4
oklch(56.2% 0.082 252.2)
-
Step 700
700
#40638B
oklch(49.1% 0.076 252.6)
-
Step 800
800
#355171
oklch(42.7% 0.063 252.5)
-
Step 900
900
#2E435B
oklch(37.6% 0.049 252.4)
-
Step 950
950
#1B2735
oklch(26.8% 0.031 252.8)
#5178A4 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) | #667AA6 | 0.027 |
| Deuteranopia (no green cones) | #5C72A3 | 0.020 |
| Tritanopia (no blue cones) | #298287 | 0.071 |
| Achromatopsia (no color) | #757575 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178A4
#5178A4
oklch(56.2% 0.082 252.2)
- #936D3C
#936D3C
oklch(56.2% 0.082 71.9)
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 #5178A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.017
- Dull Blue #49759C ΔE 0.018
- Cerulean #457B9D ΔE 0.020
- Flat Blue #3C73A8 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.033
- Muted Blue #3B719F ΔE 0.033
- Metallic Blue #4F738E ΔE 0.035
- Off Blue #5684AE ΔE 0.036
Use #5178A4 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.