#6637A3
Closest named color: Rebecca Purple (#663399). oklch(45.3% 0.166 299.7), rgb(102, 55, 163).
Aa
White text reads best on this color (7.95:1).
About this color
#6637A3 is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.166 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 0.018 away. White text reads best on it, at 7.95:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.166) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.64:1 |
| White text | 7.95:1 |
Values
| HEX | #6637A3 |
| RGB | rgb(102, 55, 163) |
| HSL | hsl(266, 50%, 43%) |
| OKLCH | oklch(45.3% 0.166 299.7) |
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 #6637A3 | 7.95:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #6637A3 | 2.64:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #6637A3 text on white | 7.95:1 | AAA | Lc 87.0 | Fine for body text |
| #6637A3 text on black | 2.64:1 | 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
#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
#CAB3F7
oklch(81% 0.097 299.7)
-
Step 400
400
#B088F2
oklch(70.8% 0.155 299.9)
-
Step 500
500
#9D65EE
oklch(63.1% 0.199 299.5)
-
Step 600
600
#8947DC
oklch(55.6% 0.216 299.6)
-
Step 700
700
#7536BF
oklch(49.1% 0.202 299.9)
-
Step 800
800 (this color)
#6637A3
oklch(45.3% 0.166 299.7)
-
Step 900
900
#4D2B7B
oklch(37.6% 0.131 299.7)
-
Step 950
950
#2D1A48
oklch(26.9% 0.083 299.9)
#6637A3 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) | #0051A6 | 0.120 |
| Deuteranopia (no green cones) | #0050A1 | 0.120 |
| Tritanopia (no blue cones) | #585068 | 0.127 |
| Achromatopsia (no color) | #515151 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6637A3
#6637A3
oklch(45.3% 0.166 299.7)
- #4F5E00
#4F5E00
oklch(45.3% 0.107 119.9)
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 #6637A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.018
- Bluey Purple #6241C7 ΔE 0.061
- Blueberry #464196 ΔE 0.062
- Grape #7209B7 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
- Chrysanthemum #560BAD ΔE 0.073
- Blurple #5539CC ΔE 0.074
Use #6637A3 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.