#5178A1
Closest named color: Stormy Blue (#507B9C). oklch(56.1% 0.078 250.5), rgb(81, 120, 161).
Aa
White text reads best on this color (4.61:1).
About this color
#5178A1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.078 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.013 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #5178A1 |
| RGB | rgb(81, 120, 161) |
| HSL | hsl(211, 33%, 47%) |
| OKLCH | oklch(56.1% 0.078 250.5) |
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 #5178A1 | 4.61:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #5178A1 | 4.55:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #5178A1 text on white | 4.61:1 | AA | Lc 72.0 | Content text, not long reading |
| #5178A1 text on black | 4.55:1 | AA | Lc -29.7 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
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
#B0C3D7
oklch(80.9% 0.035 249.6)
-
Step 400
400
#87A4C3
oklch(70.8% 0.056 250.3)
-
Step 500
500
#688DB4
oklch(63.1% 0.072 250.3)
-
Step 600
600 (this color)
#5178A1
oklch(56.1% 0.078 250.5)
-
Step 700
700
#406488
oklch(49.2% 0.071 249.5)
-
Step 800
800
#35516F
oklch(42.6% 0.061 251)
-
Step 900
900
#2E435A
oklch(37.6% 0.048 251.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#5178A1 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) | #6879A3 | 0.029 |
| Deuteranopia (no green cones) | #5D71A0 | 0.023 |
| Tritanopia (no blue cones) | #2C8186 | 0.067 |
| Achromatopsia (no color) | #757575 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178A1
#5178A1
oklch(56.1% 0.078 250.5)
- #926D3F
#926D3F
oklch(56.2% 0.078 71.1)
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 #5178A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.013
- Dull Blue #49759C ΔE 0.015
- Cerulean #457B9D ΔE 0.017
- Metallic Blue #4F738E ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.031
- Muted Blue #3B719F ΔE 0.033
- Steel Blue #4682B4 ΔE 0.035
- Off Blue #5684AE ΔE 0.037
Use #5178A1 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.