#4371C1
Closest named color: Windows Blue (#3778BF). oklch(55.5% 0.135 260.7), rgb(67, 113, 193).
Aa
White text reads best on this color (4.80:1).
About this color
#4371C1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.135 and its hue 261°. 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 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.37:1 |
| White text | 4.80:1 |
Values
| HEX | #4371C1 |
| RGB | rgb(67, 113, 193) |
| HSL | hsl(218, 50%, 51%) |
| OKLCH | oklch(55.5% 0.135 260.7) |
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 #4371C1 | 4.80:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #4371C1 | 4.37:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #4371C1 text on white | 4.80:1 | AA | Lc 73.1 | Content text, not long reading |
| #4371C1 text on black | 4.37:1 | AA large text | Lc -28.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC2E8
oklch(81% 0.06 260.4)
-
Step 400
400
#7EA1DD
oklch(70.7% 0.097 260.9)
-
Step 500
500
#5D89D4
oklch(63.2% 0.124 260.5)
-
Step 600
600 (this color)
#4371C1
oklch(55.5% 0.135 260.7)
-
Step 700
700
#355EA7
oklch(49% 0.126 261)
-
Step 800
800
#2C4D87
oklch(42.6% 0.104 260.8)
-
Step 900
900
#28416C
oklch(37.7% 0.08 260.6)
-
Step 950
950
#18263F
oklch(27% 0.051 261.4)
#4371C1 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) | #4C78C4 | 0.023 |
| Deuteranopia (no green cones) | #396DBF | 0.016 |
| Tritanopia (no blue cones) | #00838F | 0.111 |
| Achromatopsia (no color) | #727272 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4371C1
#4371C1
oklch(55.5% 0.135 260.7)
- #956A00
#956A00
oklch(55.4% 0.115 80.5)
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 #4371C1, 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 0.033
- Mid Blue #276AB3 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.042
- Nice Blue #107AB0 ΔE 0.050
- Muted Blue #3B719F ΔE 0.055
- Royal Blue #4169E1 ΔE 0.056
- Steel Blue #4682B4 ΔE 0.057
Use #4371C1 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.