#6633AB
Closest named color: Rebecca Purple (#663399). oklch(45.4% 0.181 298.3), rgb(102, 51, 171).
Aa
White text reads best on this color (7.99:1).
About this color
#6633AB is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.181 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.029 away. White text reads best on it, at 7.99:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.181) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #6633AB |
| RGB | rgb(102, 51, 171) |
| HSL | hsl(266, 54%, 44%) |
| OKLCH | oklch(45.4% 0.181 298.3) |
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 #6633AB | 7.99:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #6633AB | 2.62:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #6633AB text on white | 7.99:1 | AAA | Lc 87.0 | Fine for body text |
| #6633AB text on black | 2.62:1 | Fails | Lc -15.1 | 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 800.
-
Step 50
50
#F6F4FE
oklch(97.2% 0.013 295.3)
-
Step 100
100
#ECE6FC
oklch(93.6% 0.03 298.3)
-
Step 200
200
#DDD1FC
oklch(88.4% 0.06 297.9)
-
Step 300
300
#C9B2FC
oklch(80.9% 0.105 298.3)
-
Step 400
400
#AF85FB
oklch(70.6% 0.17 298.4)
-
Step 500
500
#9D61F8
oklch(63.2% 0.216 298.3)
-
Step 600
600
#8940E7
oklch(55.6% 0.235 298.2)
-
Step 700
700
#752FC8
oklch(49.1% 0.219 298.6)
-
Step 800
800 (this color)
#6633AB
oklch(45.4% 0.181 298.3)
-
Step 900
900
#4D2981
oklch(37.8% 0.141 298.1)
-
Step 950
950
#2D194B
oklch(27% 0.089 298.7)
#6633AB 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) | #0051AF | 0.121 |
| Deuteranopia (no green cones) | #004FA9 | 0.121 |
| Tritanopia (no blue cones) | #55506B | 0.137 |
| Achromatopsia (no color) | #515151 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6633AB
#6633AB
oklch(45.4% 0.181 298.3)
- #515E00
#515E00
oklch(45.5% 0.106 118.6)
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 #6633AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.029
- Grape #7209B7 ΔE 0.052
- Bluey Purple #6241C7 ΔE 0.053
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blurple #5539CC ΔE 0.063
- Chrysanthemum #560BAD ΔE 0.063
- Purple Blue #5D21D0 ΔE 0.067
- Blueberry #464196 ΔE 0.069
Use #6633AB 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.