#5666E6
Closest named color: Royal Blue (#4169E1). oklch(56.9% 0.193 273.3), rgb(86, 102, 230).
Aa
White text reads best on this color (4.73:1).
About this color
#5666E6 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.193 and its hue 273°. 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 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #5666E6 |
| RGB | rgb(86, 102, 230) |
| HSL | hsl(233, 74%, 62%) |
| OKLCH | oklch(56.9% 0.193 273.3) |
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 #5666E6 | 4.73:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #5666E6 | 4.43:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #5666E6 text on white | 4.73:1 | AA | Lc 72.4 | Content text, not long reading |
| #5666E6 text on black | 4.43:1 | AA large text | Lc -29.2 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#AEBDF9
oklch(80.8% 0.087 273.5)
-
Step 400
400
#8599F7
oklch(70.8% 0.139 273.3)
-
Step 500
500
#697CF3
oklch(63.1% 0.178 273.4)
-
Step 600
600 (this color)
#5666E6
oklch(56.9% 0.193 273.3)
-
Step 700
700
#4450C4
oklch(49.1% 0.179 273.3)
-
Step 800
800
#37429E
oklch(42.6% 0.148 273.2)
-
Step 900
900
#2F397E
oklch(37.7% 0.116 273.3)
-
Step 950
950
#1B224A
oklch(27% 0.074 273)
#5666E6 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) | #007AEA | 0.065 |
| Deuteranopia (no green cones) | #006DE3 | 0.057 |
| Tritanopia (no blue cones) | #00859C | 0.163 |
| Achromatopsia (no color) | #737373 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5666E6
#5666E6
oklch(56.9% 0.193 273.3)
- #8E7400
#8E7400
oklch(56.7% 0.116 93.2)
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 #5666E6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.025
- Neon Blue #4361EE ΔE 0.029
- Dark Periwinkle #665FD1 ΔE 0.039
- Warm Blue #4B57DB ΔE 0.043
- Slate Blue #6A5ACD ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.055
Use #5666E6 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.