#4178A5
Closest named color: Dull Blue (#49759C). oklch(55.5% 0.091 245.2), rgb(65, 120, 165).
Aa
White text reads best on this color (4.71:1).
About this color
#4178A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.091 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.015 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #4178A5 |
| RGB | rgb(65, 120, 165) |
| HSL | hsl(207, 43%, 45%) |
| OKLCH | oklch(55.5% 0.091 245.2) |
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 #4178A5 | 4.71:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #4178A5 | 4.45:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #4178A5 text on white | 4.71:1 | AA | Lc 72.6 | Content text, not long reading |
| #4178A5 text on black | 4.45:1 | AA large text | Lc -29.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CDDBE8
oklch(88.5% 0.023 246.1)
-
Step 300
300
#ABC4DA
oklch(80.9% 0.041 244.9)
-
Step 400
400
#7EA5C7
oklch(70.6% 0.066 245.2)
-
Step 500
500
#5D8FB9
oklch(63.2% 0.083 245)
-
Step 600
600 (this color)
#4178A5
oklch(55.5% 0.091 245.2)
-
Step 700
700
#33658E
oklch(49.1% 0.085 245.5)
-
Step 800
800
#2B5373
oklch(42.8% 0.07 244.6)
-
Step 900
900
#27445D
oklch(37.6% 0.056 246)
-
Step 950
950
#172836
oklch(26.9% 0.035 244.4)
#4178A5 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) | #6479A7 | 0.040 |
| Deuteranopia (no green cones) | #576FA4 | 0.032 |
| Tritanopia (no blue cones) | #008388 | 0.072 |
| Achromatopsia (no color) | #737373 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4178A5
#4178A5
oklch(55.5% 0.091 245.2)
- #986734
#986734
oklch(55.5% 0.092 64.9)
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 #4178A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.018
- Cerulean #457B9D ΔE 0.018
- Muted Blue #3B719F ΔE 0.023
- Stormy Blue #507B9C ΔE 0.024
- Nice Blue #107AB0 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.034
- Metallic Blue #4F738E ΔE 0.036
Use #4178A5 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.