#5A66EF
Closest named color: Neon Blue (#4361EE). oklch(57.8% 0.204 274.3), rgb(90, 102, 239).
Aa
White text reads best on this color (4.58:1).
About this color
#5A66EF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.204 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.031 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.58:1 |
| White text | 4.58:1 |
Values
| HEX | #5A66EF |
| RGB | rgb(90, 102, 239) |
| HSL | hsl(235, 82%, 65%) |
| OKLCH | oklch(57.8% 0.204 274.3) |
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 #5A66EF | 4.58:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #5A66EF | 4.58:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #5A66EF text on white | 4.58:1 | AA | Lc 71.4 | Content text, not long reading |
| #5A66EF text on black | 4.58:1 | AA | Lc -30.3 | 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
#CED7FC
oklch(88.4% 0.052 274.5)
-
Step 300
300
#AEBDFC
oklch(81% 0.091 273.9)
-
Step 400
400
#8697FB
oklch(70.6% 0.147 274.7)
-
Step 500
500
#6A7AF8
oklch(63.1% 0.187 274.3)
-
Step 600
600 (this color)
#5A66EF
oklch(57.8% 0.204 274.3)
-
Step 700
700
#454DC9
oklch(49.1% 0.189 274.2)
-
Step 800
800
#3940A3
oklch(42.7% 0.157 274.5)
-
Step 900
900
#303881
oklch(37.8% 0.122 274.3)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#5A66EF 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 | 0.069 |
| Deuteranopia (no green cones) | #006FEC | 0.061 |
| Tritanopia (no blue cones) | #0087A1 | 0.170 |
| Achromatopsia (no color) | #757575 | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5A66EF
#5A66EF
oklch(57.8% 0.204 274.3)
- #917800
#917800
oklch(57.9% 0.119 94.3)
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 #5A66EF, 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 0.036
- Medium Slate Blue #7B68EE ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.049
- Warm Blue #4B57DB ΔE 0.052
- Cornflower #6A79F7 ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.059
- Cerulean Blue #056EEE ΔE 0.059
Use #5A66EF 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.