#40646B
Closest named color: Slate (#516572). oklch(47.9% 0.043 211.1), rgb(64, 100, 107).
Aa
White text reads best on this color (6.45:1).
About this color
#40646B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.043 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.026 away. White text reads best on it, at 6.45:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.25:1 |
| White text | 6.45:1 |
Values
| HEX | #40646B |
| RGB | rgb(64, 100, 107) |
| HSL | hsl(190, 25%, 34%) |
| OKLCH | oklch(47.9% 0.043 211.1) |
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 #40646B | 6.45:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #40646B | 3.25:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #40646B text on white | 6.45:1 | AA | Lc 82.0 | Fine for body text |
| #40646B text on black | 3.25:1 | AA large text | Lc -19.9 | 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
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D1DBDD
oklch(88.4% 0.011 211)
-
Step 300
300
#B2C4C8
oklch(80.8% 0.02 212.6)
-
Step 400
400
#8AA7AC
oklch(70.8% 0.033 209.2)
-
Step 500
500
#6C9198
oklch(63.2% 0.042 210.5)
-
Step 600
600
#537B83
oklch(55.6% 0.046 211.5)
-
Step 700
700 (this color)
#40646B
oklch(47.9% 0.043 211.1)
-
Step 800
800
#38545A
oklch(42.6% 0.035 212.5)
-
Step 900
900
#30464A
oklch(37.8% 0.028 210)
-
Step 950
950
#1D292B
oklch(27.1% 0.017 208.8)
#40646B 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) | #5E616B | 0.040 |
| Deuteranopia (no green cones) | #575C6B | 0.037 |
| Tritanopia (no blue cones) | #2F6766 | 0.022 |
| Achromatopsia (no color) | #5E5E5E | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40646B
#40646B
oklch(47.9% 0.043 211.1)
- #73554F
#73554F
oklch(47.9% 0.041 31.5)
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 #40646B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.026
- Dark Aqua #05696B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.042
- Dark Green Blue #1F6357 ΔE 0.048
- Petrol #005F6A ΔE 0.048
- Deep Turquoise #017374 ΔE 0.052
- Dark Aquamarine #017371 ΔE 0.053
- Dusty Grape #545775 ΔE 0.053
Use #40646B 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.