#663189
Closest named color: Rebecca Purple (#663399). oklch(42.6% 0.145 309.3), rgb(102, 49, 137).
Aa
White text reads best on this color (8.87:1).
About this color
#663189 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.145 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.026 away. White text reads best on it, at 8.87:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #663189 |
| RGB | rgb(102, 49, 137) |
| HSL | hsl(276, 47%, 36%) |
| OKLCH | oklch(42.6% 0.145 309.3) |
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 #663189 | 8.87:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #663189 | 2.36:1 | Fails | Lc 14.2 | Not readable |
| #663189 text on white | 8.87:1 | AAA | Lc 89.8 | Fine for body text |
| #663189 text on black | 2.36:1 | Fails | Lc -12.4 | Not readable |
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
#F8F3FB
oklch(97% 0.012 313.2)
-
Step 100
100
#EFE6F7
oklch(93.7% 0.025 309.4)
-
Step 200
200
#E2D1F1
oklch(88.4% 0.047 309.2)
-
Step 300
300
#D1B2EA
oklch(80.9% 0.084 309.6)
-
Step 400
400
#BA88E0
oklch(70.8% 0.135 309.4)
-
Step 500
500
#A866D7
oklch(63% 0.174 309.2)
-
Step 600
600
#944AC4
oklch(55.6% 0.188 309.5)
-
Step 700
700
#7E3AAA
oklch(49.1% 0.176 309.3)
-
Step 800
800 (this color)
#663189
oklch(42.6% 0.145 309.3)
-
Step 900
900
#532D6E
oklch(37.7% 0.112 309)
-
Step 950
950
#311B40
oklch(27% 0.071 309.9)
#663189 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) | #04488C | 0.128 |
| Deuteranopia (no green cones) | #254B87 | 0.113 |
| Tritanopia (no blue cones) | #614258 | 0.101 |
| Achromatopsia (no color) | #4A4A4A | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663189
#663189
oklch(42.6% 0.145 309.3)
- #3A5A00
#3A5A00
oklch(42.6% 0.114 129.5)
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 #663189, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.026
- Dark Slate Blue #483D8B ΔE 0.059
- Blueberry #464196 ΔE 0.067
- Purple #800080 ΔE 0.074
- Twilight #4E518B ΔE 0.085
- Dark Magenta #8B008B ΔE 0.086
- Chrysanthemum #560BAD ΔE 0.087
- Grape #7209B7 ΔE 0.088
Use #663189 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.