#4F66CC
Closest named color: Royal Blue (#4169E1). oklch(54.6% 0.159 270.7), rgb(79, 102, 204).
Aa
White text reads best on this color (5.11:1).
About this color
#4F66CC is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.159 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.035 away. White text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #4F66CC |
| RGB | rgb(79, 102, 204) |
| HSL | hsl(229, 55%, 55%) |
| OKLCH | oklch(54.6% 0.159 270.7) |
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 #4F66CC | 5.11:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #4F66CC | 4.10:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #4F66CC text on white | 5.11:1 | AA | Lc 75.0 | Content text, not long reading |
| #4F66CC text on black | 4.10:1 | 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
#E4E9F8
oklch(93.5% 0.021 271.2)
-
Step 200
200
#CFD8F4
oklch(88.4% 0.04 271.4)
-
Step 300
300
#AFBFF0
oklch(80.9% 0.072 270.6)
-
Step 400
400
#869CE8
oklch(70.7% 0.114 270.9)
-
Step 500
500
#6982E2
oklch(63.2% 0.147 270.7)
-
Step 600
600 (this color)
#4F66CC
oklch(54.6% 0.159 270.7)
-
Step 700
700
#4357B4
oklch(49.2% 0.149 270.9)
-
Step 800
800
#374891
oklch(42.8% 0.122 270.6)
-
Step 900
900
#2F3D74
oklch(37.8% 0.095 270.5)
-
Step 950
950
#1B2444
oklch(27% 0.061 270.1)
#4F66CC 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) | #2F74D0 | 0.042 |
| Deuteranopia (no green cones) | #1169CA | 0.047 |
| Tritanopia (no blue cones) | #007D8F | 0.137 |
| Achromatopsia (no color) | #6E6E6E | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F66CC
#4F66CC
oklch(54.6% 0.159 270.7)
- #896D00
#896D00
oklch(54.7% 0.112 90.9)
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 #4F66CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.035
- Dark Periwinkle #665FD1 ΔE 0.035
- Iris #6258C4 ΔE 0.041
- Slate Blue #6A5ACD ΔE 0.044
- Warm Blue #4B57DB ΔE 0.045
- Light Indigo #6D5ACF ΔE 0.048
- French Blue #436BAD ΔE 0.055
- Neon Blue #4361EE ΔE 0.056
Use #4F66CC 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.