#666377
Closest named color: Slate (#516572). oklch(51% 0.032 292.1), rgb(102, 99, 119).
Aa
White text reads best on this color (5.80:1).
About this color
#666377 is a medium-dark, muted purple. In OKLCH its lightness is 51%, its chroma 0.032 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Slate (#516572), ΔE 0.033 away. White text reads best on it, at 5.80:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.032) |
| Temperature | in between |
| Nearest name | Slate (#516572) |
| Black text | 3.61:1 |
| White text | 5.80:1 |
Values
| HEX | #666377 |
| RGB | rgb(102, 99, 119) |
| HSL | hsl(249, 9%, 43%) |
| OKLCH | oklch(51% 0.032 292.1) |
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 #666377 | 5.80:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #666377 | 3.61:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #666377 text on white | 5.80:1 | AA | Lc 79.1 | Fine for body text |
| #666377 text on black | 3.61:1 | AA large text | Lc -22.7 | 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
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#D9D8DE
oklch(88.5% 0.008 293.9)
-
Step 300
300
#C0BFCA
oklch(80.9% 0.015 290.2)
-
Step 400
400
#A09EAF
oklch(70.6% 0.025 291.2)
-
Step 500
500
#89869B
oklch(63% 0.031 292)
-
Step 600
600
#737086
oklch(55.6% 0.034 291.5)
-
Step 700
700 (this color)
#666377
oklch(51% 0.032 292.1)
-
Step 800
800
#4F4D5C
oklch(42.8% 0.025 291.4)
-
Step 900
900
#42404C
oklch(37.8% 0.02 293)
-
Step 950
950
#26252C
oklch(26.8% 0.013 292.1)
#666377 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) | #5F6678 | 0.013 |
| Deuteranopia (no green cones) | #5F6576 | 0.012 |
| Tritanopia (no blue cones) | #63666A | 0.026 |
| Achromatopsia (no color) | #656565 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666377
#666377
oklch(51% 0.032 292.1)
- #666853
#666853
oklch(50.9% 0.032 112)
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 #666377, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.033
- Dim Gray #696969 ΔE 0.033
- Dusty Grape #545775 ΔE 0.048
- Battleship Gray #6C757D ΔE 0.053
- Metallic Blue #4F738E ΔE 0.055
- Dusty Purple #825F87 ΔE 0.056
- Muted Purple #805B87 ΔE 0.057
- Dull Purple #84597E ΔE 0.058
Use #666377 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.