#4C66CE
Closest named color: Royal Blue (#4169E1). oklch(54.6% 0.163 269.7), rgb(76, 102, 206).
Aa
White text reads best on this color (5.12:1).
About this color
#4C66CE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.163 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.031 away. White text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.09:1 |
| White text | 5.12:1 |
Values
| HEX | #4C66CE |
| RGB | rgb(76, 102, 206) |
| HSL | hsl(228, 57%, 55%) |
| OKLCH | oklch(54.6% 0.163 269.7) |
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 #4C66CE | 5.12:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #4C66CE | 4.09:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #4C66CE text on white | 5.12:1 | AA | Lc 75.0 | Fine for body text |
| #4C66CE text on black | 4.09:1 | AA large text | Lc -26.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#AEBFF1
oklch(80.9% 0.073 270.1)
-
Step 400
400
#849CEA
oklch(70.6% 0.118 270.2)
-
Step 500
500
#6682E4
oklch(63.1% 0.151 269.7)
-
Step 600
600 (this color)
#4C66CE
oklch(54.6% 0.163 269.7)
-
Step 700
700
#4057B5
oklch(49.1% 0.151 269.7)
-
Step 800
800
#354893
oklch(42.8% 0.125 269.8)
-
Step 900
900
#2D3D75
oklch(37.7% 0.098 269.3)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#4C66CE 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) | #2B74D2 | 0.042 |
| Deuteranopia (no green cones) | #0168CC | 0.048 |
| Tritanopia (no blue cones) | #007E90 | 0.138 |
| Achromatopsia (no color) | #6E6E6E | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C66CE
#4C66CE
oklch(54.6% 0.163 269.7)
- #8A6C00
#8A6C00
oklch(54.5% 0.111 89.4)
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 #4C66CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.031
- Dark Periwinkle #665FD1 ΔE 0.037
- Warm Blue #4B57DB ΔE 0.043
- Iris #6258C4 ΔE 0.043
- Slate Blue #6A5ACD ΔE 0.047
- Light Indigo #6D5ACF ΔE 0.051
- Neon Blue #4361EE ΔE 0.052
- French Blue #436BAD ΔE 0.057
Use #4C66CE 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.