#4B66BE
Closest named color: French Blue (#436BAD). oklch(53.4% 0.141 268.5), rgb(75, 102, 190).
Aa
White text reads best on this color (5.32:1).
About this color
#4B66BE is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.141 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.033 away. White text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.94:1 |
| White text | 5.32:1 |
Values
| HEX | #4B66BE |
| RGB | rgb(75, 102, 190) |
| HSL | hsl(226, 47%, 52%) |
| OKLCH | oklch(53.4% 0.141 268.5) |
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 #4B66BE | 5.32:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #4B66BE | 3.94:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #4B66BE text on white | 5.32:1 | AA | Lc 76.3 | Fine for body text |
| #4B66BE text on black | 3.94:1 | AA large text | Lc -25.5 | 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
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AFC0EB
oklch(80.9% 0.064 268.1)
-
Step 400
400
#869EE0
oklch(70.7% 0.101 268.5)
-
Step 500
500
#6985D8
oklch(63.2% 0.129 268.5)
-
Step 600
600 (this color)
#4B66BE
oklch(53.4% 0.141 268.5)
-
Step 700
700
#425AAA
oklch(49% 0.131 268.7)
-
Step 800
800
#364A8A
oklch(42.7% 0.109 268.5)
-
Step 900
900
#2F3E6E
oklch(37.6% 0.085 269)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#4B66BE 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) | #3C71C1 | 0.031 |
| Deuteranopia (no green cones) | #2A66BC | 0.032 |
| Tritanopia (no blue cones) | #007A89 | 0.122 |
| Achromatopsia (no color) | #6B6B6B | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B66BE
#4B66BE
oklch(53.4% 0.141 268.5)
- #876800
#876800
oklch(53.3% 0.109 88)
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 #4B66BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.033
- Mid Blue #276AB3 ΔE 0.039
- Iris #6258C4 ΔE 0.046
- Windows Blue #3778BF ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.050
- Royal Blue #4169E1 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.056
Use #4B66BE 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.