#4372B5
Closest named color: Windows Blue (#3778BF). oklch(55% 0.117 257.4), rgb(67, 114, 181).
Aa
White text reads best on this color (4.86:1).
About this color
#4372B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.117 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #4372B5 |
| RGB | rgb(67, 114, 181) |
| HSL | hsl(215, 46%, 49%) |
| OKLCH | oklch(55% 0.117 257.4) |
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 #4372B5 | 4.86:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #4372B5 | 4.31:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #4372B5 text on white | 4.86:1 | AA | Lc 73.5 | Content text, not long reading |
| #4372B5 text on black | 4.31:1 | AA large text | Lc -28.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#7FA2D5
oklch(70.6% 0.085 257.7)
-
Step 500
500
#5F8BCA
oklch(63.2% 0.107 257.4)
-
Step 600
600 (this color)
#4372B5
oklch(55% 0.117 257.4)
-
Step 700
700
#36619D
oklch(49.1% 0.108 257.1)
-
Step 800
800
#2D4F80
oklch(42.7% 0.091 257.6)
-
Step 900
900
#294266
oklch(37.7% 0.069 257.5)
-
Step 950
950
#18273C
oklch(27% 0.044 256.9)
#4372B5 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) | #5577B8 | 0.026 |
| Deuteranopia (no green cones) | #456CB4 | 0.016 |
| Tritanopia (no blue cones) | #00818B | 0.096 |
| Achromatopsia (no color) | #717171 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4372B5
#4372B5
oklch(55% 0.117 257.4)
- #966700
#966700
oklch(54.9% 0.115 77.4)
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 #4372B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- French Blue #436BAD ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.023
- Mid Blue #276AB3 ΔE 0.036
- Muted Blue #3B719F ΔE 0.036
- Nice Blue #107AB0 ΔE 0.038
- Dull Blue #49759C ΔE 0.043
- Steel Blue #4682B4 ΔE 0.047
Use #4372B5 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.