#39666E
Closest named color: Slate (#516572). oklch(48.1% 0.051 210.2), rgb(57, 102, 110).
Aa
White text reads best on this color (6.36:1).
About this color
#39666E is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.051 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.030 away. White text reads best on it, at 6.36:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.29:1 |
| White text | 6.36:1 |
Values
| HEX | #39666E |
| RGB | rgb(57, 102, 110) |
| HSL | hsl(189, 32%, 33%) |
| OKLCH | oklch(48.1% 0.051 210.2) |
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 #39666E | 6.36:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #39666E | 3.29:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #39666E text on white | 6.36:1 | AA | Lc 81.5 | Fine for body text |
| #39666E text on black | 3.29:1 | AA large text | Lc -20.3 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#CFDCDE
oklch(88.5% 0.014 207.9)
-
Step 300
300
#AFC5C9
oklch(80.8% 0.025 209.8)
-
Step 400
400
#85A8AE
oklch(70.8% 0.039 209.1)
-
Step 500
500
#65929B
oklch(63.1% 0.051 211.4)
-
Step 600
600
#4B7C85
oklch(55.5% 0.055 210.5)
-
Step 700
700 (this color)
#39666E
oklch(48.1% 0.051 210.2)
-
Step 800
800
#32555C
oklch(42.6% 0.042 211.7)
-
Step 900
900
#2C474B
oklch(37.8% 0.033 207.6)
-
Step 950
950
#1A292C
oklch(26.9% 0.021 211.4)
#39666E 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) | #5F636F | 0.049 |
| Deuteranopia (no green cones) | #565C6E | 0.045 |
| Tritanopia (no blue cones) | #1E6A68 | 0.028 |
| Achromatopsia (no color) | #5F5F5F | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39666E
#39666E
oklch(48.1% 0.051 210.2)
- #78534D
#78534D
oklch(48.1% 0.051 29.3)
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 #39666E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.030
- Dark Aqua #05696B ΔE 0.033
- Deep Turquoise #017374 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.045
- Petrol #005F6A ΔE 0.045
- Dark Aquamarine #017371 ΔE 0.045
- Dark Green Blue #1F6357 ΔE 0.046
- Denim #3B638C ΔE 0.053
Use #39666E 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.