#5E66CC
Closest named color: Dark Periwinkle (#665FD1). oklch(55.6% 0.155 276.7), rgb(94, 102, 204).
Aa
White text reads best on this color (4.94:1).
About this color
#5E66CC is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.155 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.021 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #5E66CC |
| RGB | rgb(94, 102, 204) |
| HSL | hsl(236, 52%, 58%) |
| OKLCH | oklch(55.6% 0.155 276.7) |
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 #5E66CC | 4.94:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #5E66CC | 4.24:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #5E66CC text on white | 4.94:1 | AA | Lc 74.0 | Content text, not long reading |
| #5E66CC text on black | 4.24:1 | AA large text | Lc -27.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F3
oklch(88.4% 0.039 277.6)
-
Step 300
300
#B4BDEE
oklch(80.8% 0.07 276.6)
-
Step 400
400
#8F9AE6
oklch(70.8% 0.112 276.9)
-
Step 500
500
#747FDE
oklch(63.1% 0.142 276.5)
-
Step 600
600 (this color)
#5E66CC
oklch(55.6% 0.155 276.7)
-
Step 700
700
#4E54B1
oklch(49.1% 0.145 276.8)
-
Step 800
800
#40458F
oklch(42.6% 0.12 277.1)
-
Step 900
900
#363B72
oklch(37.7% 0.093 277)
-
Step 950
950
#1F2343
oklch(27% 0.059 276.3)
#5E66CC 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) | #3375D0 | 0.054 |
| Deuteranopia (no green cones) | #246CCA | 0.057 |
| Tritanopia (no blue cones) | #297D8F | 0.137 |
| Achromatopsia (no color) | #707070 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5E66CC
#5E66CC
oklch(55.6% 0.155 276.7)
- #877200
#877200
oklch(55.5% 0.114 96.2)
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 #5E66CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.032
- Light Indigo #6D5ACF ΔE 0.035
- Iris #6258C4 ΔE 0.035
- Royal Blue #4169E1 ΔE 0.045
- Warm Blue #4B57DB ΔE 0.053
- French Blue #436BAD ΔE 0.062
- Neon Blue #4361EE ΔE 0.064
Use #5E66CC 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.