#5E66EF
Closest named color: Neon Blue (#4361EE). oklch(58.1% 0.203 275.6), rgb(94, 102, 239).
Aa
Black text reads best on this color (4.62:1).
About this color
#5E66EF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.203 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.036 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #5E66EF |
| RGB | rgb(94, 102, 239) |
| HSL | hsl(237, 82%, 65%) |
| OKLCH | oklch(58.1% 0.203 275.6) |
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 #5E66EF | 4.54:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #5E66EF | 4.62:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #5E66EF text on white | 4.54:1 | AA | Lc 71.1 | Content text, not long reading |
| #5E66EF text on black | 4.62:1 | AA | Lc -30.6 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFC
oklch(80.9% 0.092 275.9)
-
Step 400
400
#8897FA
oklch(70.7% 0.145 275.5)
-
Step 500
500
#6D79F7
oklch(63% 0.186 275.6)
-
Step 600
600 (this color)
#5E66EF
oklch(58.1% 0.203 275.6)
-
Step 700
700
#484CC8
oklch(49% 0.189 275.5)
-
Step 800
800
#3B40A2
oklch(42.8% 0.156 275.4)
-
Step 900
900
#323780
oklch(37.6% 0.121 275.9)
-
Step 950
950
#1D214B
oklch(27% 0.077 275.9)
#5E66EF 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) | #007CF4 | 0.072 |
| Deuteranopia (no green cones) | #0070EC | 0.065 |
| Tritanopia (no blue cones) | #0087A1 | 0.172 |
| Achromatopsia (no color) | #767676 | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5E66EF
#5E66EF
oklch(58.1% 0.203 275.6)
- #907900
#907900
oklch(58% 0.119 95.7)
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 #5E66EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.040
- Medium Slate Blue #7B68EE ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.048
- Cornflower #6A79F7 ΔE 0.050
- Warm Blue #4B57DB ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.058
Use #5E66EF 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.