#668C8B
Closest named color: Steel Grey (#6F828A). oklch(61.2% 0.042 194.1), rgb(102, 140, 139).
Aa
Black text reads best on this color (5.68:1).
About this color
#668C8B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 61%, its chroma 0.042 and its hue 194°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Grey (#6F828A), ΔE 0.030 away. Black text reads best on it, at 5.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Steel Grey (#6F828A) |
| Black text | 5.68:1 |
| White text | 3.69:1 |
Values
| HEX | #668C8B |
| RGB | rgb(102, 140, 139) |
| HSL | hsl(178, 16%, 47%) |
| OKLCH | oklch(61.2% 0.042 194.1) |
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 #668C8B | 3.69:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #668C8B | 5.68:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #668C8B text on white | 3.69:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #668C8B text on black | 5.68:1 | AA | Lc -37.2 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D1DCDB
oklch(88.6% 0.012 190.4)
-
Step 300
300
#B2C5C4
oklch(80.9% 0.021 192.9)
-
Step 400
400
#8AA7A6
oklch(70.6% 0.032 193.9)
-
Step 500
500 (this color)
#668C8B
oklch(61.2% 0.042 194.1)
-
Step 600
600
#537C7B
oklch(55.6% 0.046 194)
-
Step 700
700
#436968
oklch(49.2% 0.043 193.7)
-
Step 800
800
#385555
oklch(42.7% 0.035 195.9)
-
Step 900
900
#304646
oklch(37.6% 0.027 196)
-
Step 950
950
#1D2929
oklch(27% 0.017 196.2)
#668C8B 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) | #87888B | 0.044 |
| Deuteranopia (no green cones) | #80838B | 0.041 |
| Tritanopia (no blue cones) | #598E8C | 0.015 |
| Achromatopsia (no color) | #858585 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #668C8B
#668C8B
oklch(61.2% 0.042 194.1)
- #9B7A7C
#9B7A7C
oklch(61.2% 0.041 14.3)
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 #668C8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Grey #6F828A ΔE 0.030
- Dusty Teal #4C9085 ΔE 0.032
- Steel #738595 ΔE 0.034
- Light Slate Gray #778899 ΔE 0.036
- Slate Gray #708090 ΔE 0.040
- Blue Grey #758DA3 ΔE 0.043
- Medium Grey #7D7F7C ΔE 0.044
- Gray #808080 ΔE 0.044
Use #668C8B 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.