#4371CC
Closest named color: Windows Blue (#3778BF). oklch(56.2% 0.15 262.4), rgb(67, 113, 204).
Aa
White text reads best on this color (4.69:1).
About this color
#4371CC is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.150 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #4371CC |
| RGB | rgb(67, 113, 204) |
| HSL | hsl(220, 57%, 53%) |
| OKLCH | oklch(56.2% 0.15 262.4) |
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 #4371CC | 4.69:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #4371CC | 4.47:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #4371CC text on white | 4.69:1 | AA | Lc 72.3 | Content text, not long reading |
| #4371CC text on black | 4.47:1 | AA large text | Lc -29.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7CA0E4
oklch(70.7% 0.108 262.5)
-
Step 500
500
#5B87DC
oklch(63.1% 0.137 262.4)
-
Step 600
600 (this color)
#4371CC
oklch(56.2% 0.15 262.4)
-
Step 700
700
#335CAF
oklch(49% 0.14 262.6)
-
Step 800
800
#2B4C8D
oklch(42.7% 0.115 262.4)
-
Step 900
900
#274071
oklch(37.8% 0.09 262.5)
-
Step 950
950
#172642
oklch(27.1% 0.056 262)
#4371CC 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) | #457ACF | 0.024 |
| Deuteranopia (no green cones) | #2C6ECA | 0.023 |
| Tritanopia (no blue cones) | #008694 | 0.123 |
| Achromatopsia (no color) | #747474 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4371CC
#4371CC
oklch(56.2% 0.15 262.4)
- #966D00
#966D00
oklch(56.1% 0.116 82.4)
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 #4371CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Royal Blue #4169E1 ΔE 0.040
- French Blue #436BAD ΔE 0.049
- Mid Blue #276AB3 ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.059
- Cerulean Blue #056EEE ΔE 0.062
- Water Blue #0E87CC ΔE 0.062
Use #4371CC 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.