#4C66D2
Closest named color: Royal Blue (#4169E1). oklch(54.9% 0.169 269.9), rgb(76, 102, 210).
Aa
White text reads best on this color (5.07:1).
About this color
#4C66D2 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.169 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.025 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #4C66D2 |
| RGB | rgb(76, 102, 210) |
| HSL | hsl(228, 60%, 56%) |
| OKLCH | oklch(54.9% 0.169 269.9) |
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 #4C66D2 | 5.07:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #4C66D2 | 4.13:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #4C66D2 text on white | 5.07:1 | AA | Lc 74.7 | Content text, not long reading |
| #4C66D2 text on black | 4.13:1 | AA large text | Lc -27.0 | 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 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ADBFF3
oklch(80.9% 0.076 269.8)
-
Step 400
400
#839CEC
oklch(70.7% 0.121 269.9)
-
Step 500
500
#6581E6
oklch(63% 0.155 269.9)
-
Step 600
600 (this color)
#4C66D2
oklch(54.9% 0.169 269.9)
-
Step 700
700
#3F56B8
oklch(49% 0.157 269.8)
-
Step 800
800
#344795
oklch(42.7% 0.13 269.8)
-
Step 900
900
#2D3C77
oklch(37.6% 0.102 270.2)
-
Step 950
950
#1A2446
oklch(27.1% 0.065 269.4)
#4C66D2 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) | #2575D6 | 0.045 |
| Deuteranopia (no green cones) | #0069D0 | 0.047 |
| Tritanopia (no blue cones) | #007F92 | 0.141 |
| Achromatopsia (no color) | #6E6E6E | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4C66D2
#4C66D2
oklch(54.9% 0.169 269.9)
- #8B6D00
#8B6D00
oklch(54.9% 0.112 89.6)
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 #4C66D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.025
- Dark Periwinkle #665FD1 ΔE 0.036
- Warm Blue #4B57DB ΔE 0.039
- Iris #6258C4 ΔE 0.045
- Neon Blue #4361EE ΔE 0.046
- Slate Blue #6A5ACD ΔE 0.047
- Light Indigo #6D5ACF ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.059
Use #4C66D2 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.