#4C66B2
Closest named color: French Blue (#436BAD). oklch(52.7% 0.124 267.8), rgb(76, 102, 178).
Aa
White text reads best on this color (5.45:1).
About this color
#4C66B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.124 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.019 away. White text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.85:1 |
| White text | 5.45:1 |
Values
| HEX | #4C66B2 |
| RGB | rgb(76, 102, 178) |
| HSL | hsl(225, 40%, 50%) |
| OKLCH | oklch(52.7% 0.124 267.8) |
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 #4C66B2 | 5.45:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #4C66B2 | 3.85:1 | AA large text | Lc 27.0 | Dividers and decoration only |
| #4C66B2 text on white | 5.45:1 | AA | Lc 77.0 | Fine for body text |
| #4C66B2 text on black | 3.85:1 | AA large text | Lc -24.7 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E6
oklch(80.9% 0.056 268.2)
-
Step 400
400
#889FD9
oklch(70.7% 0.089 267.5)
-
Step 500
500
#6C86CE
oklch(63.1% 0.113 268)
-
Step 600
600 (this color)
#4C66B2
oklch(52.7% 0.124 267.8)
-
Step 700
700
#445CA2
oklch(49.1% 0.116 267.8)
-
Step 800
800
#384C83
oklch(42.8% 0.095 267.3)
-
Step 900
900
#303F69
oklch(37.6% 0.075 267.8)
-
Step 950
950
#1C253D
oklch(26.9% 0.047 267.6)
#4C66B2 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) | #456EB5 | 0.022 |
| Deuteranopia (no green cones) | #3865B0 | 0.023 |
| Tritanopia (no blue cones) | #037783 | 0.111 |
| Achromatopsia (no color) | #696969 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C66B2
#4C66B2
oklch(52.7% 0.124 267.8)
- #856600
#856600
oklch(52.7% 0.108 87.7)
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 #4C66B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.019
- Mid Blue #276AB3 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.050
- Windows Blue #3778BF ΔE 0.050
- Muted Blue #3B719F ΔE 0.051
- Iris #6258C4 ΔE 0.055
- Dull Blue #49759C ΔE 0.061
Use #4C66B2 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.