#643091
Closest named color: Rebecca Purple (#663399). oklch(42.8% 0.155 305.4), rgb(100, 48, 145).
Aa
White text reads best on this color (8.84:1).
About this color
#643091 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.155 and its hue 305°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.015 away. White text reads best on it, at 8.84:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.155) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.37:1 |
| White text | 8.84:1 |
Values
| HEX | #643091 |
| RGB | rgb(100, 48, 145) |
| HSL | hsl(272, 50%, 38%) |
| OKLCH | oklch(42.8% 0.155 305.4) |
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 #643091 | 8.84:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #643091 | 2.37:1 | Fails | Lc 14.3 | Not readable |
| #643091 text on white | 8.84:1 | AAA | Lc 89.7 | Fine for body text |
| #643091 text on black | 2.37:1 | Fails | Lc -12.6 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EEE6F8
oklch(93.6% 0.025 305.8)
-
Step 200
200
#E1D1F4
oklch(88.4% 0.05 306)
-
Step 300
300
#CEB2F0
oklch(80.9% 0.091 305.1)
-
Step 400
400
#B687E8
oklch(70.7% 0.145 305.3)
-
Step 500
500
#A565E1
oklch(63.1% 0.186 305.6)
-
Step 600
600
#9048CF
oklch(55.6% 0.202 305.2)
-
Step 700
700
#7B38B3
oklch(49.1% 0.187 305.5)
-
Step 800
800 (this color)
#643091
oklch(42.8% 0.155 305.4)
-
Step 900
900
#512C73
oklch(37.7% 0.12 305.4)
-
Step 950
950
#2F1B44
oklch(27.1% 0.076 304.3)
#643091 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) | #004994 | 0.125 |
| Deuteranopia (no green cones) | #154A8F | 0.119 |
| Tritanopia (no blue cones) | #5C455C | 0.112 |
| Achromatopsia (no color) | #4A4A4A | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #643091
#643091
oklch(42.8% 0.155 305.4)
- #415900
#415900
oklch(42.8% 0.109 125.6)
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 #643091, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.015
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.063
- Chrysanthemum #560BAD ΔE 0.074
- Grape #7209B7 ΔE 0.076
- Purple #800080 ΔE 0.079
- Twilight #4E518B ΔE 0.087
- Imperial Purple #480CA8 ΔE 0.089
Use #643091 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.