#6639A8
Closest named color: Rebecca Purple (#663399). oklch(46% 0.17 298), rgb(102, 57, 168).
Aa
White text reads best on this color (7.73:1).
About this color
#6639A8 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.170 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 0.027 away. White text reads best on it, at 7.73:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.170) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.71:1 |
| White text | 7.73:1 |
Values
| HEX | #6639A8 |
| RGB | rgb(102, 57, 168) |
| HSL | hsl(264, 49%, 44%) |
| OKLCH | oklch(46% 0.17 298) |
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 #6639A8 | 7.73:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #6639A8 | 2.71:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #6639A8 text on white | 7.73:1 | AAA | Lc 86.3 | Fine for body text |
| #6639A8 text on black | 2.71:1 | Fails | Lc -15.8 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EBE7F8
oklch(93.6% 0.023 296.7)
-
Step 200
200
#DCD3F4
oklch(88.4% 0.046 297.9)
-
Step 300
300
#C7B6EF
oklch(81% 0.081 298.2)
-
Step 400
400
#AB8DE7
oklch(70.6% 0.132 298.3)
-
Step 500
500
#976EE0
oklch(63% 0.168 298)
-
Step 600
600
#8353CE
oklch(55.6% 0.183 298.2)
-
Step 700
700 (this color)
#6639A8
oklch(46% 0.17 298)
-
Step 800
800
#5A3890
oklch(42.7% 0.14 298)
-
Step 900
900
#4A3173
oklch(37.7% 0.11 298.5)
-
Step 950
950
#2B1D43
oklch(26.9% 0.07 298.6)
#6639A8 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) | #0053AB | 0.117 |
| Deuteranopia (no green cones) | #0051A6 | 0.117 |
| Tritanopia (no blue cones) | #56536B | 0.131 |
| Achromatopsia (no color) | #535353 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6639A8
#6639A8
oklch(46% 0.17 298)
- #535F00
#535F00
oklch(45.9% 0.107 117.9)
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 #6639A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.027
- Bluey Purple #6241C7 ΔE 0.052
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Grape #7209B7 ΔE 0.063
- Blueberry #464196 ΔE 0.064
- Blurple #5539CC ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.071
- Chrysanthemum #560BAD ΔE 0.074
Use #6639A8 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.