#5E66E2
Closest named color: Dark Periwinkle (#665FD1). oklch(57.1% 0.185 276), rgb(94, 102, 226).
Aa
White text reads best on this color (4.69:1).
About this color
#5E66E2 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.185 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.031 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #5E66E2 |
| RGB | rgb(94, 102, 226) |
| HSL | hsl(236, 69%, 63%) |
| OKLCH | oklch(57.1% 0.185 276) |
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 #5E66E2 | 4.69:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #5E66E2 | 4.47:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #5E66E2 text on white | 4.69:1 | AA | Lc 72.2 | Content text, not long reading |
| #5E66E2 text on black | 4.47:1 | AA large text | Lc -29.4 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B1BDF7
oklch(81% 0.083 275.3)
-
Step 400
400
#8A98F3
oklch(70.7% 0.134 275.8)
-
Step 500
500
#707BEE
oklch(63% 0.171 276.2)
-
Step 600
600 (this color)
#5E66E2
oklch(57.1% 0.185 276)
-
Step 700
700
#4A50C0
oklch(49.2% 0.172 275.7)
-
Step 800
800
#3D429B
oklch(42.7% 0.143 276.1)
-
Step 900
900
#33397B
oklch(37.7% 0.111 275.8)
-
Step 950
950
#1E2248
oklch(27% 0.07 276.2)
#5E66E2 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) | #0479E6 | 0.070 |
| Deuteranopia (no green cones) | #006EDF | 0.067 |
| Tritanopia (no blue cones) | #00839A | 0.161 |
| Achromatopsia (no color) | #747474 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5E66E2
#5E66E2
oklch(57.1% 0.185 276)
- #8C7600
#8C7600
oklch(57% 0.117 96)
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 #5E66E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.031
- Royal Blue #4169E1 ΔE 0.033
- Neon Blue #4361EE ΔE 0.041
- Light Indigo #6D5ACF ΔE 0.042
- Slate Blue #6A5ACD ΔE 0.043
- Medium Slate Blue #7B68EE ΔE 0.047
- Warm Blue #4B57DB ΔE 0.047
- Iris #6258C4 ΔE 0.054
Use #5E66E2 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.