#5178A9
Closest named color: Dull Blue (#49759C). oklch(56.5% 0.088 254.7), rgb(81, 120, 169).
Aa
Black text reads best on this color (4.60:1).
About this color
#5178A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.088 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.024 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.60:1 |
| White text | 4.55:1 |
Values
| HEX | #5178A9 |
| RGB | rgb(81, 120, 169) |
| HSL | hsl(213, 35%, 49%) |
| OKLCH | oklch(56.5% 0.088 254.7) |
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 #5178A9 | 4.55:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #5178A9 | 4.60:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #5178A9 text on white | 4.55:1 | AA | Lc 71.5 | Content text, not long reading |
| #5178A9 text on black | 4.60:1 | AA | Lc -30.1 | 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
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B0C2DA
oklch(80.8% 0.039 255.6)
-
Step 400
400
#86A3C8
oklch(70.7% 0.063 254.7)
-
Step 500
500
#678CBA
oklch(63.1% 0.081 254.3)
-
Step 600
600 (this color)
#5178A9
oklch(56.5% 0.088 254.7)
-
Step 700
700
#3F628E
oklch(49% 0.082 254.8)
-
Step 800
800
#345074
oklch(42.6% 0.069 255.2)
-
Step 900
900
#2E435D
oklch(37.7% 0.052 254.2)
-
Step 950
950
#1B2737
oklch(26.9% 0.034 255.8)
#5178A9 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) | #657BAB | 0.027 |
| Deuteranopia (no green cones) | #5A72A8 | 0.019 |
| Tritanopia (no blue cones) | #248389 | 0.078 |
| Achromatopsia (no color) | #767676 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5178A9
#5178A9
oklch(56.5% 0.088 254.7)
- #946E35
#946E35
oklch(56.5% 0.088 75.3)
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 #5178A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.024
- Stormy Blue #507B9C ΔE 0.025
- Cerulean #457B9D ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.030
- Off Blue #5684AE ΔE 0.035
- Muted Blue #3B719F ΔE 0.035
- Cool Blue #4984B8 ΔE 0.036
Use #5178A9 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.