#663EB7
Closest named color: Bluey Purple (#6241C7). oklch(47.9% 0.181 293.6), rgb(102, 62, 183).
Aa
White text reads best on this color (7.14:1).
About this color
#663EB7 is a medium-dark, vivid purple. In OKLCH its lightness is 48%, its chroma 0.181 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.027 away. White text reads best on it, at 7.14:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.181) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 2.93:1 |
| White text | 7.14:1 |
Values
| HEX | #663EB7 |
| RGB | rgb(102, 62, 183) |
| HSL | hsl(260, 49%, 48%) |
| OKLCH | oklch(47.9% 0.181 293.6) |
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 #663EB7 | 7.14:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #663EB7 | 2.93:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #663EB7 text on white | 7.14:1 | AAA | Lc 84.3 | Fine for body text |
| #663EB7 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
#F6F4FD
oklch(97.1% 0.012 296.4)
-
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
#C3B6F4
oklch(80.9% 0.087 294)
-
Step 400
400
#A58EEF
oklch(70.7% 0.14 293.4)
-
Step 500
500
#916EEA
oklch(63.1% 0.18 293.6)
-
Step 600
600
#7D53D8
oklch(55.7% 0.194 293.7)
-
Step 700
700 (this color)
#663EB7
oklch(47.9% 0.181 293.6)
-
Step 800
800
#563797
oklch(42.7% 0.15 294)
-
Step 900
900
#463178
oklch(37.6% 0.116 293.7)
-
Step 950
950
#291D47
oklch(26.9% 0.076 293.9)
#663EB7 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) | #0059BB | 0.111 |
| Deuteranopia (no green cones) | #0056B5 | 0.110 |
| Tritanopia (no blue cones) | #4F5B75 | 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°).
- #663EB7
#663EB7
oklch(47.9% 0.181 293.6)
- #5D6300
#5D6300
oklch(47.8% 0.107 113.8)
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 #663EB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.027
- Blue With A Hint Of Purple #533CC6 ΔE 0.042
- Blurple #5539CC ΔE 0.047
- Rebecca Purple #663399 ΔE 0.053
- Iris #6258C4 ΔE 0.060
- Purple Blue #5D21D0 ΔE 0.062
- Grape #7209B7 ΔE 0.068
- Slate Blue #6A5ACD ΔE 0.070
Use #663EB7 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.