#40666E
Closest named color: Slate (#516572). oklch(48.5% 0.045 212.4), rgb(64, 102, 110).
Aa
White text reads best on this color (6.28:1).
About this color
#40666E is a medium-dark, muted teal or cyan. In OKLCH its lightness is 49%, its chroma 0.045 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.023 away. White text reads best on it, at 6.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.34:1 |
| White text | 6.28:1 |
Values
| HEX | #40666E |
| RGB | rgb(64, 102, 110) |
| HSL | hsl(190, 26%, 34%) |
| OKLCH | oklch(48.5% 0.045 212.4) |
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 #40666E | 6.28:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #40666E | 3.34:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #40666E text on white | 6.28:1 | AA | Lc 81.2 | Fine for body text |
| #40666E text on black | 3.34:1 | AA large text | Lc -20.7 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B1C5C9
oklch(81% 0.023 211.1)
-
Step 400
400
#88A7AD
oklch(70.7% 0.035 210.7)
-
Step 500
500
#6A9199
oklch(63.1% 0.045 211.7)
-
Step 600
600
#517B84
oklch(55.6% 0.048 212.6)
-
Step 700
700 (this color)
#40666E
oklch(48.5% 0.045 212.4)
-
Step 800
800
#36555B
oklch(42.8% 0.038 211.1)
-
Step 900
900
#2F464B
oklch(37.7% 0.03 212.7)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#40666E 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) | #60636F | 0.043 |
| Deuteranopia (no green cones) | #585E6E | 0.038 |
| Tritanopia (no blue cones) | #2D6968 | 0.024 |
| Achromatopsia (no color) | #606060 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40666E
#40666E
oklch(48.5% 0.045 212.4)
- #76564F
#76564F
oklch(48.5% 0.044 32.6)
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 #40666E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.023
- Dark Aqua #05696B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.044
- Deep Turquoise #017374 ΔE 0.048
- Dark Aquamarine #017371 ΔE 0.049
- Dark Green Blue #1F6357 ΔE 0.051
- Petrol #005F6A ΔE 0.052
- Denim #3B638C ΔE 0.053
Use #40666E 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.