#4178B8
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.116 253.6), rgb(65, 120, 184).
Aa
Black text reads best on this color (4.60:1).
About this color
#4178B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.116 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.013 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.60:1 |
| White text | 4.56:1 |
Values
| HEX | #4178B8 |
| RGB | rgb(65, 120, 184) |
| HSL | hsl(212, 48%, 49%) |
| OKLCH | oklch(56.5% 0.116 253.6) |
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 #4178B8 | 4.56:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #4178B8 | 4.60:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #4178B8 text on white | 4.56:1 | AA | Lc 71.5 | Content text, not long reading |
| #4178B8 text on black | 4.60:1 | AA | Lc -30.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#AAC3E2
oklch(80.9% 0.052 253.9)
-
Step 400
400
#7CA4D4
oklch(70.8% 0.083 253.4)
-
Step 500
500
#5A8CC8
oklch(63% 0.106 253.8)
-
Step 600
600 (this color)
#4178B8
oklch(56.5% 0.116 253.6)
-
Step 700
700
#30629C
oklch(49% 0.108 253.7)
-
Step 800
800
#29507E
oklch(42.6% 0.089 253.9)
-
Step 900
900
#264366
oklch(37.8% 0.07 254.1)
-
Step 950
950
#17273B
oklch(26.9% 0.043 254.6)
#4178B8 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) | #5C7CBB | 0.033 |
| Deuteranopia (no green cones) | #4C71B7 | 0.021 |
| Tritanopia (no blue cones) | #00878F | 0.094 |
| Achromatopsia (no color) | #767676 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4178B8
#4178B8
oklch(56.5% 0.116 253.6)
- #9E6A0F
#9E6A0F
oklch(56.6% 0.116 73.8)
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 #4178B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.013
- Flat Blue #3C73A8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.032
- Nice Blue #107AB0 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.036
- French Blue #436BAD ΔE 0.037
- Muted Blue #3B719F ΔE 0.042
- Dull Blue #49759C ΔE 0.043
Use #4178B8 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.