#5F66EC
Closest named color: Neon Blue (#4361EE). oklch(57.9% 0.198 276), rgb(95, 102, 236).
Aa
Black text reads best on this color (4.59:1).
About this color
#5F66EC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.198 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.038 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #5F66EC |
| RGB | rgb(95, 102, 236) |
| HSL | hsl(237, 79%, 65%) |
| OKLCH | oklch(57.9% 0.198 276) |
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 #5F66EC | 4.56:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #5F66EC | 4.59:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #5F66EC text on white | 4.56:1 | AA | Lc 71.3 | Content text, not long reading |
| #5F66EC text on black | 4.59:1 | AA | Lc -30.4 | 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
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B0BCFB
oklch(80.9% 0.09 275.9)
-
Step 400
400
#8997F8
oklch(70.7% 0.142 275.9)
-
Step 500
500
#6E79F5
oklch(63% 0.183 276)
-
Step 600
600 (this color)
#5F66EC
oklch(57.9% 0.198 276)
-
Step 700
700
#4A4DC6
oklch(49.1% 0.184 276.2)
-
Step 800
800
#3C40A0
oklch(42.7% 0.153 276)
-
Step 900
900
#33387F
oklch(37.8% 0.118 276.1)
-
Step 950
950
#1D214A
oklch(26.9% 0.075 275.9)
#5F66EC 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) | #007CF1 | 0.074 |
| Deuteranopia (no green cones) | #0070E9 | 0.067 |
| Tritanopia (no blue cones) | #00869F | 0.170 |
| Achromatopsia (no color) | #767676 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F66EC
#5F66EC
oklch(57.9% 0.198 276)
- #8F7900
#8F7900
oklch(57.9% 0.119 96.3)
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 #5F66EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.038
- Royal Blue #4169E1 ΔE 0.039
- Medium Slate Blue #7B68EE ΔE 0.041
- Dark Periwinkle #665FD1 ΔE 0.044
- Cornflower #6A79F7 ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.053
- Warm Blue #4B57DB ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.054
Use #5F66EC 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.