#4C66B8
Closest named color: French Blue (#436BAD). oklch(53.1% 0.132 268.4), rgb(76, 102, 184).
Aa
White text reads best on this color (5.38:1).
About this color
#4C66B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.132 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.89:1 |
| White text | 5.38:1 |
Values
| HEX | #4C66B8 |
| RGB | rgb(76, 102, 184) |
| HSL | hsl(226, 43%, 51%) |
| OKLCH | oklch(53.1% 0.132 268.4) |
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 #4C66B8 | 5.38:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #4C66B8 | 3.89:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #4C66B8 text on white | 5.38:1 | AA | Lc 76.6 | Fine for body text |
| #4C66B8 text on black | 3.89:1 | AA large text | Lc -25.1 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B0C0E8
oklch(80.9% 0.059 267.9)
-
Step 400
400
#879EDD
oklch(70.6% 0.096 268.5)
-
Step 500
500
#6A85D3
oklch(63% 0.122 268.3)
-
Step 600
600 (this color)
#4C66B8
oklch(53.1% 0.132 268.4)
-
Step 700
700
#435BA6
oklch(49% 0.123 268.3)
-
Step 800
800
#384B86
oklch(42.8% 0.101 268.5)
-
Step 900
900
#303F6C
oklch(37.8% 0.08 268.5)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#4C66B8 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) | #416FBB | 0.025 |
| Deuteranopia (no green cones) | #3266B6 | 0.027 |
| Tritanopia (no blue cones) | #007886 | 0.116 |
| Achromatopsia (no color) | #6A6A6A | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C66B8
#4C66B8
oklch(53.1% 0.132 268.4)
- #866700
#866700
oklch(53% 0.108 87.8)
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 #4C66B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Mid Blue #276AB3 ΔE 0.036
- Windows Blue #3778BF ΔE 0.049
- Iris #6258C4 ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.056
- Muted Blue #3B719F ΔE 0.058
- Dusky Blue #475F94 ΔE 0.058
Use #4C66B8 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.