#6637AA
Closest named color: Rebecca Purple (#663399). oklch(45.9% 0.175 297.9), rgb(102, 55, 170).
Aa
White text reads best on this color (7.80:1).
About this color
#6637AA is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.175 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 0.028 away. White text reads best on it, at 7.80:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.175) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.69:1 |
| White text | 7.80:1 |
Values
| HEX | #6637AA |
| RGB | rgb(102, 55, 170) |
| HSL | hsl(265, 51%, 44%) |
| OKLCH | oklch(45.9% 0.175 297.9) |
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 #6637AA | 7.80:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #6637AA | 2.69:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #6637AA text on white | 7.80:1 | AAA | Lc 86.5 | Fine for body text |
| #6637AA text on black | 2.69:1 | Fails | Lc -15.6 | 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
#F6F4FE
oklch(97.2% 0.013 295.3)
-
Step 100
100
#ECE6FC
oklch(93.6% 0.03 298.3)
-
Step 200
200
#DDD2FB
oklch(88.6% 0.057 297.5)
-
Step 300
300
#C8B3FA
oklch(80.9% 0.101 297.7)
-
Step 400
400
#AE87F8
oklch(70.7% 0.163 298)
-
Step 500
500
#9B63F5
oklch(63% 0.21 297.8)
-
Step 600
600
#8744E3
oklch(55.6% 0.226 297.8)
-
Step 700
700
#7333C5
oklch(49% 0.211 298)
-
Step 800
800 (this color)
#6637AA
oklch(45.9% 0.175 297.9)
-
Step 900
900
#4C2A7F
oklch(37.7% 0.137 297.9)
-
Step 950
950
#2C1A4A
oklch(27% 0.086 297.6)
#6637AA 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) | #0052AD | 0.118 |
| Deuteranopia (no green cones) | #0051A8 | 0.119 |
| Tritanopia (no blue cones) | #56526C | 0.133 |
| Achromatopsia (no color) | #525252 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6637AA
#6637AA
oklch(45.9% 0.175 297.9)
- #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 #6637AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.028
- Bluey Purple #6241C7 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Grape #7209B7 ΔE 0.059
- Blurple #5539CC ΔE 0.063
- Blueberry #464196 ΔE 0.066
- Chrysanthemum #560BAD ΔE 0.070
- Purple Blue #5D21D0 ΔE 0.071
Use #6637AA 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.