#66259B
Closest named color: Rebecca Purple (#663399). oklch(42.5% 0.18 304.8), rgb(102, 37, 155).
Aa
White text reads best on this color (9.11:1).
About this color
#66259B is a dark, vivid purple. In OKLCH its lightness is 42%, its chroma 0.180 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 0.025 away. White text reads best on it, at 9.11:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | vivid (0.180) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #66259B |
| RGB | rgb(102, 37, 155) |
| HSL | hsl(273, 61%, 38%) |
| OKLCH | oklch(42.5% 0.18 304.8) |
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 #66259B | 9.11:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #66259B | 2.30:1 | Fails | Lc 13.9 | Not readable |
| #66259B text on white | 9.11:1 | AAA | Lc 90.1 | Preferred for body text |
| #66259B text on black | 2.30:1 | Fails | Lc -12.2 | 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
#F7F3FD
oklch(97% 0.014 304.1)
-
Step 100
100
#EEE5FB
oklch(93.5% 0.031 304.3)
-
Step 200
200
#E2D0F9
oklch(88.5% 0.059 305.1)
-
Step 300
300
#D0B0F8
oklch(81% 0.105 304.5)
-
Step 400
400
#B982F4
oklch(70.7% 0.168 304.7)
-
Step 500
500
#A85CEF
oklch(63% 0.215 304.8)
-
Step 600
600
#943ADE
oklch(55.6% 0.234 304.7)
-
Step 700
700
#7E2AC0
oklch(49% 0.217 304.7)
-
Step 800
800 (this color)
#66259B
oklch(42.5% 0.18 304.8)
-
Step 900
900
#53267C
oklch(37.7% 0.14 304.5)
-
Step 950
950
#311848
oklch(27.1% 0.088 305.3)
#66259B 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) | #00479E | 0.135 |
| Deuteranopia (no green cones) | #004899 | 0.136 |
| Tritanopia (no blue cones) | #5C425E | 0.129 |
| Achromatopsia (no color) | #484848 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66259B
#66259B
oklch(42.5% 0.18 304.8)
- #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 #66259B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.025
- Grape #7209B7 ΔE 0.053
- Chrysanthemum #560BAD ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.075
- Imperial Purple #480CA8 ΔE 0.076
- Blueberry #464196 ΔE 0.077
- Purple #800080 ΔE 0.078
- Dark Magenta #8B008B ΔE 0.085
Use #66259B 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.