#4F66A3
Closest named color: French Blue (#436BAD). oklch(52% 0.101 267.2), rgb(79, 102, 163).
Aa
White text reads best on this color (5.58:1).
About this color
#4F66A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.101 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.021 away. White text reads best on it, at 5.58:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.76:1 |
| White text | 5.58:1 |
Values
| HEX | #4F66A3 |
| RGB | rgb(79, 102, 163) |
| HSL | hsl(224, 35%, 47%) |
| OKLCH | oklch(52% 0.101 267.2) |
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 #4F66A3 | 5.58:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #4F66A3 | 3.76:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #4F66A3 text on white | 5.58:1 | AA | Lc 77.8 | Fine for body text |
| #4F66A3 text on black | 3.76:1 | AA large text | Lc -24.0 | 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 700.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8B9FD2
oklch(70.6% 0.078 267.8)
-
Step 500
500
#6F87C6
oklch(63.1% 0.099 267.6)
-
Step 600
600
#5770B3
oklch(55.6% 0.109 267.3)
-
Step 700
700 (this color)
#4F66A3
oklch(52% 0.101 267.2)
-
Step 800
800
#3B4D7D
oklch(42.8% 0.083 267.3)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#4F66A3 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) | #4E6CA5 | 0.017 |
| Deuteranopia (no green cones) | #4564A2 | 0.014 |
| Tritanopia (no blue cones) | #29737D | 0.090 |
| Achromatopsia (no color) | #686868 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66A3
#4F66A3
oklch(52% 0.101 267.2)
- #826411
#826411
oklch(52% 0.1 86.5)
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 #4F66A3, closest first.
No curated palette has a color within ΔE 0.04 of #4F66A3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.021
- Dusky Blue #475F94 ΔE 0.031
- Muted Blue #3B719F ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.043
- Denim #3B638C ΔE 0.046
- Dull Blue #49759C ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.048
Use #4F66A3 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.