#5666F8
Closest named color: Neon Blue (#4361EE). oklch(58.3% 0.216 272.9), rgb(86, 102, 248).
Aa
Black text reads best on this color (4.65:1).
About this color
#5666F8 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.216 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.031 away. Black text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.216) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.65:1 |
| White text | 4.51:1 |
Values
| HEX | #5666F8 |
| RGB | rgb(86, 102, 248) |
| HSL | hsl(234, 92%, 65%) |
| OKLCH | oklch(58.3% 0.216 272.9) |
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 #5666F8 | 4.51:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #5666F8 | 4.65:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #5666F8 text on white | 4.51:1 | AA | Lc 70.8 | Content text, not long reading |
| #5666F8 text on black | 4.65:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FE
oklch(88.6% 0.054 272.5)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600 (this color)
#5666F8
oklch(58.3% 0.216 272.9)
-
Step 700
700
#414BD0
oklch(49.1% 0.202 273)
-
Step 800
800
#353FA8
oklch(42.7% 0.167 272.9)
-
Step 900
900
#2D3785
oklch(37.7% 0.13 273)
-
Step 950
950
#1A214E
oklch(27% 0.083 273)
#5666F8 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) | #007EFD | 0.067 |
| Deuteranopia (no green cones) | #006FF5 | 0.055 |
| Tritanopia (no blue cones) | #008AA5 | 0.178 |
| Achromatopsia (no color) | #767676 | 0.217 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5666F8
#5666F8
oklch(58.3% 0.216 272.9)
- #947800
#947800
oklch(58.3% 0.119 92.5)
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 #5666F8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.031
- Royal Blue #4169E1 ΔE 0.043
- Medium Slate Blue #7B68EE ΔE 0.055
- Cornflower #6A79F7 ΔE 0.055
- Clear Blue #247AFD ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.057
- Bright Blue #0165FC ΔE 0.058
- Warm Blue #4B57DB ΔE 0.058
Use #5666F8 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.