#663DB9
Closest named color: Bluey Purple (#6241C7). oklch(47.9% 0.185 293.4), rgb(102, 61, 185).
Aa
White text reads best on this color (7.15:1).
About this color
#663DB9 is a medium-dark, vivid purple. In OKLCH its lightness is 48%, its chroma 0.185 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 7.15:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.185) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 2.93:1 |
| White text | 7.15:1 |
Values
| HEX | #663DB9 |
| RGB | rgb(102, 61, 185) |
| HSL | hsl(260, 50%, 48%) |
| OKLCH | oklch(47.9% 0.185 293.4) |
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 #663DB9 | 7.15:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #663DB9 | 2.93:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #663DB9 text on white | 7.15:1 | AAA | Lc 84.3 | Fine for body text |
| #663DB9 text on black | 2.93:1 | Fails | Lc -17.7 | 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 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
#DAD4F8
oklch(88.6% 0.049 293)
-
Step 300
300
#C3B6F6
oklch(80.9% 0.09 293.6)
-
Step 400
400
#A58EF1
oklch(70.8% 0.143 293.1)
-
Step 500
500
#916EEC
oklch(63.2% 0.183 293.3)
-
Step 600
600
#7C52DA
oklch(55.6% 0.198 293.1)
-
Step 700
700 (this color)
#663DB9
oklch(47.9% 0.185 293.4)
-
Step 800
800
#563799
oklch(42.8% 0.152 293.5)
-
Step 900
900
#46317A
oklch(37.8% 0.119 293.1)
-
Step 950
950
#291D47
oklch(26.9% 0.076 293.9)
#663DB9 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) | #0059BD | 0.111 |
| Deuteranopia (no green cones) | #0055B6 | 0.111 |
| Tritanopia (no blue cones) | #4E5B76 | 0.146 |
| Achromatopsia (no color) | #585858 | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663DB9
#663DB9
oklch(47.9% 0.185 293.4)
- #5E6300
#5E6300
oklch(47.9% 0.107 113.2)
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 #663DB9, 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 0.040
- Blurple #5539CC ΔE 0.045
- Rebecca Purple #663399 ΔE 0.055
- Purple Blue #5D21D0 ΔE 0.059
- Iris #6258C4 ΔE 0.061
- Grape #7209B7 ΔE 0.066
- Burple #6832E3 ΔE 0.067
Use #663DB9 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.