#663BB5
Closest named color: Bluey Purple (#6241C7). oklch(47.3% 0.182 294.6), rgb(102, 59, 181).
Aa
White text reads best on this color (7.34:1).
About this color
#663BB5 is a medium-dark, vivid purple. In OKLCH its lightness is 47%, its chroma 0.182 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Bluey Purple (#6241C7), ΔE 0.032 away. White text reads best on it, at 7.34:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.182) |
| Temperature | in between |
| Nearest name | Bluey Purple (#6241C7) |
| Black text | 2.85:1 |
| White text | 7.34:1 |
Values
| HEX | #663BB5 |
| RGB | rgb(102, 59, 181) |
| HSL | hsl(261, 51%, 47%) |
| OKLCH | oklch(47.3% 0.182 294.6) |
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 #663BB5 | 7.34:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #663BB5 | 2.85:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #663BB5 text on white | 7.34:1 | AAA | Lc 84.9 | Fine for body text |
| #663BB5 text on black | 2.85:1 | Fails | Lc -17.1 | 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
#DBD3F7
oklch(88.5% 0.05 295.5)
-
Step 300
300
#C4B6F4
oklch(80.9% 0.088 294.7)
-
Step 400
400
#A78DEF
oklch(70.7% 0.142 294.7)
-
Step 500
500
#936DEA
oklch(63.1% 0.182 294.7)
-
Step 600
600
#7E51D8
oklch(55.5% 0.197 294.4)
-
Step 700
700 (this color)
#663BB5
oklch(47.3% 0.182 294.6)
-
Step 800
800
#573697
oklch(42.6% 0.151 294.8)
-
Step 900
900
#473178
oklch(37.7% 0.116 294.4)
-
Step 950
950
#291D47
oklch(26.9% 0.076 293.9)
#663BB5 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) | #0057B9 | 0.113 |
| Deuteranopia (no green cones) | #0054B3 | 0.113 |
| Tritanopia (no blue cones) | #505873 | 0.142 |
| Achromatopsia (no color) | #565656 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663BB5
#663BB5
oklch(47.3% 0.182 294.6)
- #5B6200
#5B6200
oklch(47.4% 0.107 114.5)
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 #663BB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluey Purple #6241C7 ΔE 0.032
- Blue With A Hint Of Purple #533CC6 ΔE 0.044
- Rebecca Purple #663399 ΔE 0.047
- Blurple #5539CC ΔE 0.049
- Purple Blue #5D21D0 ΔE 0.061
- Grape #7209B7 ΔE 0.062
- Iris #6258C4 ΔE 0.067
- Burple #6832E3 ΔE 0.073
Use #663BB5 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.