#642F91
Closest named color: Rebecca Purple (#663399). oklch(42.6% 0.156 305.6), rgb(100, 47, 145).
Aa
White text reads best on this color (8.90:1).
About this color
#642F91 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.156 and its hue 306°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.016 away. White text reads best on it, at 8.90:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.156) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.35:1 |
| White text | 8.90:1 |
Values
| HEX | #642F91 |
| RGB | rgb(100, 47, 145) |
| HSL | hsl(272, 51%, 38%) |
| OKLCH | oklch(42.6% 0.156 305.6) |
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 #642F91 | 8.90:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #642F91 | 2.35:1 | Fails | Lc 14.2 | Not readable |
| #642F91 text on white | 8.90:1 | AAA | Lc 89.8 | Fine for body text |
| #642F91 text on black | 2.35:1 | 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
#F7F3FC
oklch(97% 0.013 306)
-
Step 100
100
#EEE6F8
oklch(93.6% 0.025 305.8)
-
Step 200
200
#E1D1F5
oklch(88.5% 0.052 305.4)
-
Step 300
300
#CFB2F0
oklch(81% 0.091 305.8)
-
Step 400
400
#B787E8
oklch(70.7% 0.145 305.8)
-
Step 500
500
#A565E1
oklch(63.1% 0.186 305.6)
-
Step 600
600
#9147CF
oklch(55.6% 0.203 305.8)
-
Step 700
700
#7B37B3
oklch(49% 0.189 305.6)
-
Step 800
800 (this color)
#642F91
oklch(42.6% 0.156 305.6)
-
Step 900
900
#512B74
oklch(37.6% 0.123 305.2)
-
Step 950
950
#301A44
oklch(27% 0.078 306)
#642F91 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) | #004894 | 0.126 |
| Deuteranopia (no green cones) | #134A8F | 0.121 |
| Tritanopia (no blue cones) | #5C445C | 0.111 |
| Achromatopsia (no color) | #4A4A4A | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #642F91
#642F91
oklch(42.6% 0.156 305.6)
- #415800
#415800
oklch(42.6% 0.107 125.2)
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 #642F91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.016
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.064
- Chrysanthemum #560BAD ΔE 0.073
- Grape #7209B7 ΔE 0.075
- Purple #800080 ΔE 0.078
- Imperial Purple #480CA8 ΔE 0.088
- Dark Magenta #8B008B ΔE 0.089
Use #642F91 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.