#6664D4
Closest named color: Dark Periwinkle (#665FD1). oklch(56.3% 0.168 280.4), rgb(102, 100, 212).
Aa
White text reads best on this color (4.84:1).
About this color
#6664D4 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.168 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.012 away. White text reads best on it, at 4.84:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.33:1 |
| White text | 4.84:1 |
Values
| HEX | #6664D4 |
| RGB | rgb(102, 100, 212) |
| HSL | hsl(241, 57%, 61%) |
| OKLCH | oklch(56.3% 0.168 280.4) |
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 #6664D4 | 4.84:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #6664D4 | 4.33:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #6664D4 text on white | 4.84:1 | AA | Lc 73.3 | Content text, not long reading |
| #6664D4 text on black | 4.33:1 | AA large text | Lc -28.4 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F9
oklch(93.7% 0.022 280.3)
-
Step 200
200
#D3D7F5
oklch(88.5% 0.041 279.5)
-
Step 300
300
#B7BCF1
oklch(81% 0.075 280.4)
-
Step 400
400
#9397EA
oklch(70.7% 0.121 280.7)
-
Step 500
500
#7A7BE4
oklch(63.1% 0.155 280.6)
-
Step 600
600 (this color)
#6664D4
oklch(56.3% 0.168 280.4)
-
Step 700
700
#5350B6
oklch(49.1% 0.157 280.2)
-
Step 800
800
#444293
oklch(42.6% 0.13 280.5)
-
Step 900
900
#393975
oklch(37.7% 0.1 280.5)
-
Step 950
950
#212245
oklch(27.1% 0.064 280)
#6664D4 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) | #2676D8 | 0.071 |
| Deuteranopia (no green cones) | #176DD2 | 0.074 |
| Tritanopia (no blue cones) | #387D92 | 0.145 |
| Achromatopsia (no color) | #727272 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6664D4
#6664D4
oklch(56.3% 0.168 280.4)
- #857600
#857600
oklch(56.2% 0.117 100.5)
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 #6664D4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.012
- Light Indigo #6D5ACF ΔE 0.025
- Slate Blue #6A5ACD ΔE 0.025
- Iris #6258C4 ΔE 0.037
- Royal Blue #4169E1 ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.052
- Warm Blue #4B57DB ΔE 0.053
- Neon Blue #4361EE ΔE 0.060
Use #6664D4 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.