#663FB8
Closest named color: Bluey Purple (#6241C7). oklch(48.1% 0.181 293.2), rgb(102, 63, 184).
Aa
White text reads best on this color (7.07:1).
About this color
#663FB8 is a medium-dark, vivid purple. In OKLCH its lightness is 48%, its chroma 0.181 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.025 away. White text reads best on it, at 7.07:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.181) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 2.96:1 |
| White text | 7.07:1 |
Values
| HEX | #663FB8 |
| RGB | rgb(102, 63, 184) |
| HSL | hsl(259, 49%, 48%) |
| OKLCH | oklch(48.1% 0.181 293.2) |
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 #663FB8 | 7.07:1 | AAA | Lc -89.0 | Fine for body text |
| Black text on #663FB8 | 2.96:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #663FB8 text on white | 7.07:1 | AAA | Lc 84.0 | Fine for body text |
| #663FB8 text on black | 2.96:1 | Fails | Lc -18.0 | 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 700.
-
Step 50
50
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#EAE7FA
oklch(93.6% 0.026 293.1)
-
Step 200
200
#DAD4F7
oklch(88.6% 0.048 293.3)
-
Step 300
300
#C2B6F5
oklch(80.8% 0.089 293)
-
Step 400
400
#A58EEF
oklch(70.7% 0.14 293.4)
-
Step 500
500
#906FEA
oklch(63.2% 0.179 292.9)
-
Step 600
600
#7C53D8
oklch(55.6% 0.194 293.2)
-
Step 700
700 (this color)
#663FB8
oklch(48.1% 0.181 293.2)
-
Step 800
800
#553798
oklch(42.6% 0.151 293.2)
-
Step 900
900
#463179
oklch(37.7% 0.118 293.4)
-
Step 950
950
#291E47
oklch(27.2% 0.074 293.2)
#663FB8 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) | #005ABC | 0.110 |
| Deuteranopia (no green cones) | #0056B6 | 0.109 |
| Tritanopia (no blue cones) | #4F5C76 | 0.143 |
| Achromatopsia (no color) | #585858 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663FB8
#663FB8
oklch(48.1% 0.181 293.2)
- #5F6400
#5F6400
oklch(48.2% 0.108 113.1)
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 #663FB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.025
- Blue With A Hint Of Purple #533CC6 ΔE 0.042
- Blurple #5539CC ΔE 0.047
- Rebecca Purple #663399 ΔE 0.055
- Iris #6258C4 ΔE 0.057
- Purple Blue #5D21D0 ΔE 0.063
- Slate Blue #6A5ACD ΔE 0.068
- Burple #6832E3 ΔE 0.069
Use #663FB8 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.