#64397D
Closest named color: Rebecca Purple (#663399). oklch(42.8% 0.117 311.6), rgb(100, 57, 125).
Aa
White text reads best on this color (8.66:1).
About this color
#64397D is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.117 and its hue 312°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.049 away. White text reads best on it, at 8.66:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.117) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #64397D |
| RGB | rgb(100, 57, 125) |
| HSL | hsl(278, 37%, 36%) |
| OKLCH | oklch(42.8% 0.117 311.6) |
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 #64397D | 8.66:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #64397D | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #64397D text on white | 8.66:1 | AAA | Lc 89.4 | Fine for body text |
| #64397D text on black | 2.42:1 | Fails | Lc -12.8 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE6F4
oklch(93.5% 0.021 311.1)
-
Step 200
200
#E1D2EC
oklch(88.4% 0.039 311.1)
-
Step 300
300
#CFB5E1
oklch(81% 0.067 311.4)
-
Step 400
400
#B78CD2
oklch(70.6% 0.11 311.8)
-
Step 500
500
#A56EC6
oklch(63% 0.14 311.7)
-
Step 600
600
#9055B3
oklch(55.7% 0.151 311.4)
-
Step 700
700
#7B449A
oklch(49.1% 0.142 311.8)
-
Step 800
800 (this color)
#64397D
oklch(42.8% 0.117 311.6)
-
Step 900
900
#513264
oklch(37.7% 0.09 311.4)
-
Step 950
950
#301D3B
oklch(27% 0.059 312.1)
#64397D 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) | #27497F | 0.098 |
| Deuteranopia (no green cones) | #354C7B | 0.087 |
| Tritanopia (no blue cones) | #614455 | 0.081 |
| Achromatopsia (no color) | #4B4B4B | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #64397D
#64397D
oklch(42.8% 0.117 311.6)
- #365B02
#365B02
oklch(42.7% 0.117 131.6)
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 #64397D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.067
- Twilight #4E518B ΔE 0.070
- Dusk #4E5481 ΔE 0.077
- Light Eggplant #894585 ΔE 0.081
- Dusty Grape #545775 ΔE 0.088
- Purple #800080 ΔE 0.089
Use #64397D 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.