#66638B
Closest named color: Muted Purple (#805B87). oklch(51.8% 0.063 287.4), rgb(102, 99, 139).
Aa
White text reads best on this color (5.64:1).
About this color
#66638B is a medium-dark, muted purple. In OKLCH its lightness is 52%, its chroma 0.063 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Purple (#805B87), ΔE 0.045 away. White text reads best on it, at 5.64:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Muted Purple (#805B87) |
| Black text | 3.72:1 |
| White text | 5.64:1 |
Values
| HEX | #66638B |
| RGB | rgb(102, 99, 139) |
| HSL | hsl(245, 17%, 47%) |
| OKLCH | oklch(51.8% 0.063 287.4) |
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 #66638B | 5.64:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #66638B | 3.72:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #66638B text on white | 5.64:1 | AA | Lc 78.2 | Fine for body text |
| #66638B text on black | 3.72:1 | AA large text | Lc -23.6 | Dividers and decoration only |
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 700.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D8E4
oklch(88.6% 0.016 286.1)
-
Step 300
300
#BFBED4
oklch(80.9% 0.031 287.8)
-
Step 400
400
#9E9CBE
oklch(70.6% 0.049 287.8)
-
Step 500
500
#8784AE
oklch(63.1% 0.063 287.7)
-
Step 600
600
#716D99
oklch(55.6% 0.068 288.1)
-
Step 700
700 (this color)
#66638B
oklch(51.8% 0.063 287.4)
-
Step 800
800
#4D4B6A
oklch(42.8% 0.051 287)
-
Step 900
900
#403E56
oklch(37.6% 0.041 288.1)
-
Step 950
950
#252532
oklch(27% 0.024 284.7)
#66638B 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) | #58688D | 0.023 |
| Deuteranopia (no green cones) | #58668A | 0.022 |
| Tritanopia (no blue cones) | #5E6A71 | 0.054 |
| Achromatopsia (no color) | #676767 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66638B
#66638B
oklch(51.8% 0.063 287.4)
- #6C6B40
#6C6B40
oklch(51.8% 0.062 107.2)
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 #66638B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Purple #805B87 ΔE 0.045
- Dusty Purple #825F87 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.049
- Metallic Blue #4F738E ΔE 0.052
- Slate #516572 ΔE 0.054
- Dusty Grape #545775 ΔE 0.055
- Dull Purple #84597E ΔE 0.055
- Grey Purple #826D8C ΔE 0.055
Use #66638B 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.