#6633A5
Closest named color: Rebecca Purple (#663399). oklch(44.9% 0.174 299.9), rgb(102, 51, 165).
Aa
White text reads best on this color (8.13:1).
About this color
#6633A5 is a dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.174 and its hue 300°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.019 away. White text reads best on it, at 8.13:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | vivid (0.174) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #6633A5 |
| RGB | rgb(102, 51, 165) |
| HSL | hsl(267, 53%, 42%) |
| OKLCH | oklch(44.9% 0.174 299.9) |
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 #6633A5 | 8.13:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #6633A5 | 2.58:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #6633A5 text on white | 8.13:1 | AAA | Lc 87.5 | Fine for body text |
| #6633A5 text on black | 2.58:1 | Fails | Lc -14.6 | Not readable |
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
#F7F4FE
oklch(97.2% 0.014 299.8)
-
Step 100
100
#ECE6FB
oklch(93.6% 0.029 298.9)
-
Step 200
200
#DED1FA
oklch(88.4% 0.057 299.7)
-
Step 300
300
#CAB2F9
oklch(80.9% 0.101 299.6)
-
Step 400
400
#B186F6
oklch(70.7% 0.163 300)
-
Step 500
500
#9F62F2
oklch(63.1% 0.208 300)
-
Step 600
600
#8B42E1
oklch(55.6% 0.227 299.9)
-
Step 700
700
#7632C3
oklch(49.1% 0.21 299.9)
-
Step 800
800 (this color)
#6633A5
oklch(44.9% 0.174 299.9)
-
Step 900
900
#4E2A7D
oklch(37.7% 0.135 299.9)
-
Step 950
950
#2D1A49
oklch(27% 0.084 299.3)
#6633A5 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) | #004FA8 | 0.122 |
| Deuteranopia (no green cones) | #004FA3 | 0.123 |
| Tritanopia (no blue cones) | #584E68 | 0.131 |
| Achromatopsia (no color) | #4F4F4F | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6633A5
#6633A5
oklch(44.9% 0.174 299.9)
- #4E5D00
#4E5D00
oklch(45% 0.107 120)
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 #6633A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.019
- Grape #7209B7 ΔE 0.056
- Bluey Purple #6241C7 ΔE 0.061
- Chrysanthemum #560BAD ΔE 0.065
- Blueberry #464196 ΔE 0.066
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.070
- Blurple #5539CC ΔE 0.072
Use #6633A5 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.