#6639A3
Closest named color: Rebecca Purple (#663399). oklch(45.6% 0.164 299.3), rgb(102, 57, 163).
Aa
White text reads best on this color (7.83:1).
About this color
#6639A3 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.164 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.020 away. White text reads best on it, at 7.83:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.164) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.67:1 |
| White text | 7.83:1 |
Values
| HEX | #6639A3 |
| RGB | rgb(102, 57, 163) |
| HSL | hsl(265, 48%, 43%) |
| OKLCH | oklch(45.6% 0.164 299.3) |
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 #6639A3 | 7.83:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #6639A3 | 2.67:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #6639A3 text on white | 7.83:1 | AAA | Lc 86.7 | Fine for body text |
| #6639A3 text on black | 2.67:1 | Fails | Lc -15.4 | 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
#F6F4FD
oklch(97.1% 0.012 296.4)
-
Step 100
100
#ECE6FA
oklch(93.6% 0.027 299.5)
-
Step 200
200
#DED2F8
oklch(88.5% 0.053 299.7)
-
Step 300
300
#C9B3F6
oklch(80.9% 0.096 299.3)
-
Step 400
400
#AF88F2
oklch(70.7% 0.154 299.4)
-
Step 500
500
#9C66ED
oklch(63.1% 0.196 299.1)
-
Step 600
600
#8848DB
oklch(55.6% 0.213 299.3)
-
Step 700
700
#7438BE
oklch(49.1% 0.198 299.4)
-
Step 800
800 (this color)
#6639A3
oklch(45.6% 0.164 299.3)
-
Step 900
900
#4D2C7A
oklch(37.7% 0.128 299.7)
-
Step 950
950
#2D1B48
oklch(27.1% 0.081 299.4)
#6639A3 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) | #0052A6 | 0.118 |
| Deuteranopia (no green cones) | #0251A1 | 0.118 |
| Tritanopia (no blue cones) | #585169 | 0.124 |
| Achromatopsia (no color) | #525252 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6639A3
#6639A3
oklch(45.6% 0.164 299.3)
- #515F00
#515F00
oklch(45.7% 0.108 119.2)
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 #6639A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.020
- Bluey Purple #6241C7 ΔE 0.060
- Blueberry #464196 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.066
- Blue With A Hint Of Purple #533CC6 ΔE 0.066
- Grape #7209B7 ΔE 0.067
- Blurple #5539CC ΔE 0.073
- Chrysanthemum #560BAD ΔE 0.076
Use #6639A3 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.