#66858C
Closest named color: Steel Grey (#6F828A). oklch(59.5% 0.037 213.1), rgb(102, 133, 140).
Aa
Black text reads best on this color (5.29:1).
About this color
#66858C is a medium-dark, muted teal or cyan. In OKLCH its lightness is 60%, its chroma 0.037 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Grey (#6F828A), ΔE 0.013 away. Black text reads best on it, at 5.29:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Steel Grey (#6F828A) |
| Black text | 5.29:1 |
| White text | 3.96:1 |
Values
| HEX | #66858C |
| RGB | rgb(102, 133, 140) |
| HSL | hsl(191, 16%, 47%) |
| OKLCH | oklch(59.5% 0.037 213.1) |
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 #66858C | 3.96:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #66858C | 5.29:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #66858C text on white | 3.96:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #66858C text on black | 5.29:1 | AA | Lc -34.7 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDD
oklch(88.5% 0.01 212.5)
-
Step 300
300
#B4C4C7
oklch(80.9% 0.018 210.2)
-
Step 400
400
#8DA6AB
oklch(70.8% 0.029 211.1)
-
Step 500
500 (this color)
#66858C
oklch(59.5% 0.037 213.1)
-
Step 600
600
#587A81
oklch(55.6% 0.04 211.7)
-
Step 700
700
#48676D
oklch(49.2% 0.037 210.9)
-
Step 800
800
#3B5459
oklch(42.8% 0.031 211.3)
-
Step 900
900
#334549
oklch(37.7% 0.024 212.8)
-
Step 950
950
#1E282B
oklch(26.9% 0.015 218)
#66858C 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) | #7F838C | 0.034 |
| Deuteranopia (no green cones) | #797E8C | 0.031 |
| Tritanopia (no blue cones) | #5A8887 | 0.020 |
| Achromatopsia (no color) | #808080 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66858C
#66858C
oklch(59.5% 0.037 213.1)
- #937771
#937771
oklch(59.4% 0.036 32.2)
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 #66858C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Grey #6F828A ΔE 0.013
- Slate Gray #708090 ΔE 0.021
- Steel #738595 ΔE 0.023
- Battleship Grey #6B7C85 ΔE 0.025
- Grey Blue #647D8E ΔE 0.025
- Light Slate Gray #778899 ΔE 0.032
- Medium Grey #7D7F7C ΔE 0.036
- Gray #808080 ΔE 0.037
Use #66858C 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.