#6638AC
Closest named color: Rebecca Purple (#663399). oklch(46.2% 0.176 297.2), rgb(102, 56, 172).
Aa
White text reads best on this color (7.70:1).
About this color
#6638AC is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.176 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.032 away. White text reads best on it, at 7.70:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.176) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #6638AC |
| RGB | rgb(102, 56, 172) |
| HSL | hsl(264, 51%, 45%) |
| OKLCH | oklch(46.2% 0.176 297.2) |
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 #6638AC | 7.70:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #6638AC | 2.72:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #6638AC text on white | 7.70:1 | AAA | Lc 86.2 | Fine for body text |
| #6638AC text on black | 2.72:1 | Fails | Lc -15.9 | 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
#EBE7F9
oklch(93.6% 0.024 296.1)
-
Step 200
200
#DCD3F5
oklch(88.5% 0.047 297.5)
-
Step 300
300
#C6B5F1
oklch(80.8% 0.085 297.5)
-
Step 400
400
#AA8DEA
oklch(70.7% 0.135 297.2)
-
Step 500
500
#966DE4
oklch(63% 0.174 297)
-
Step 600
600
#8252D2
oklch(55.7% 0.189 297.1)
-
Step 700
700 (this color)
#6638AC
oklch(46.2% 0.176 297.2)
-
Step 800
800
#5A3793
oklch(42.8% 0.145 297.4)
-
Step 900
900
#493175
oklch(37.7% 0.112 297)
-
Step 950
950
#2B1D45
oklch(27% 0.073 297.5)
#6638AC 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) | #0053B0 | 0.117 |
| Deuteranopia (no green cones) | #0052AA | 0.118 |
| Tritanopia (no blue cones) | #55536D | 0.134 |
| Achromatopsia (no color) | #535353 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6638AC
#6638AC
oklch(46.2% 0.176 297.2)
- #556000
#556000
oklch(46.3% 0.107 117.2)
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 #6638AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.032
- Bluey Purple #6241C7 ΔE 0.047
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Grape #7209B7 ΔE 0.059
- Blurple #5539CC ΔE 0.061
- Blueberry #464196 ΔE 0.067
- Purple Blue #5D21D0 ΔE 0.069
- Chrysanthemum #560BAD ΔE 0.072
Use #6638AC 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.