#66657F
Closest named color: Slate (#516572). oklch(51.7% 0.041 286.6), rgb(102, 101, 127).
Aa
White text reads best on this color (5.62:1).
About this color
#66657F is a medium-dark, muted purple. In OKLCH its lightness is 52%, its chroma 0.041 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.039 away. White text reads best on it, at 5.62:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #66657F |
| RGB | rgb(102, 101, 127) |
| HSL | hsl(242, 11%, 45%) |
| OKLCH | oklch(51.7% 0.041 286.6) |
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 #66657F | 5.62:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #66657F | 3.73:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #66657F text on white | 5.62:1 | AA | Lc 78.1 | Fine for body text |
| #66657F text on black | 3.73:1 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9E9ED
oklch(93.5% 0.005 286.3)
-
Step 200
200
#D8D8E0
oklch(88.5% 0.011 286.2)
-
Step 300
300
#BFBFCD
oklch(80.9% 0.02 286)
-
Step 400
400
#9F9EB4
oklch(70.7% 0.032 287.6)
-
Step 500
500
#8786A1
oklch(63% 0.04 286.9)
-
Step 600
600
#71708C
oklch(55.6% 0.043 286.5)
-
Step 700
700 (this color)
#66657F
oklch(51.7% 0.041 286.6)
-
Step 800
800
#4D4C61
oklch(42.6% 0.035 287)
-
Step 900
900
#40404F
oklch(37.7% 0.025 285.1)
-
Step 950
950
#26252E
oklch(26.9% 0.017 290.3)
#66657F 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) | #5F6880 | 0.013 |
| Deuteranopia (no green cones) | #5E677E | 0.013 |
| Tritanopia (no blue cones) | #61696E | 0.034 |
| Achromatopsia (no color) | #676767 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66657F
#66657F
oklch(51.7% 0.041 286.6)
- #6B6A4F
#6B6A4F
oklch(51.8% 0.04 106)
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 #66657F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.039
- Dim Gray #696969 ΔE 0.041
- Metallic Blue #4F738E ΔE 0.047
- Battleship Gray #6C757D ΔE 0.050
- Dusty Purple #825F87 ΔE 0.051
- Dusty Grape #545775 ΔE 0.052
- Muted Purple #805B87 ΔE 0.053
- Grey Purple #826D8C ΔE 0.055
Use #66657F 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.