#4663B3
Closest named color: French Blue (#436BAD). oklch(51.8% 0.131 266.8), rgb(70, 99, 179).
Aa
White text reads best on this color (5.68:1).
About this color
#4663B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.131 and its hue 267°. 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 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #4663B3 |
| RGB | rgb(70, 99, 179) |
| HSL | hsl(224, 44%, 49%) |
| OKLCH | oklch(51.8% 0.131 266.8) |
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 #4663B3 | 5.68:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #4663B3 | 3.69:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #4663B3 text on white | 5.68:1 | AA | Lc 78.2 | Fine for body text |
| #4663B3 text on black | 3.69:1 | AA large text | Lc -23.6 | 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 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AEC0EB
oklch(80.9% 0.064 267.2)
-
Step 400
400
#849FE0
oklch(70.8% 0.1 266.6)
-
Step 500
500
#6685D8
oklch(63.1% 0.13 267.2)
-
Step 600
600
#4E6DC5
oklch(55.5% 0.141 267.1)
-
Step 700
700 (this color)
#4663B3
oklch(51.8% 0.131 266.8)
-
Step 800
800
#344B8A
oklch(42.8% 0.108 266.8)
-
Step 900
900
#2D3F6E
oklch(37.7% 0.084 266.6)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#4663B3 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) | #3E6CB6 | 0.024 |
| Deuteranopia (no green cones) | #2E62B1 | 0.025 |
| Tritanopia (no blue cones) | #007582 | 0.114 |
| Achromatopsia (no color) | #676767 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4663B3
#4663B3
oklch(51.8% 0.131 266.8)
- #836300
#836300
oklch(51.8% 0.106 86.4)
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 #4663B3, 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 0.031
- Dusky Blue #475F94 ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.052
- Iris #6258C4 ΔE 0.054
- Muted Blue #3B719F ΔE 0.056
- Windows Blue #3778BF ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.057
Use #4663B3 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.