#40636E
Closest named color: Slate (#516572). oklch(47.7% 0.044 219.6), rgb(64, 99, 110).
Aa
White text reads best on this color (6.50:1).
About this color
#40636E is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.044 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.024 away. White text reads best on it, at 6.50:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.22:1 |
| White text | 6.50:1 |
Values
| HEX | #40636E |
| RGB | rgb(64, 99, 110) |
| HSL | hsl(194, 26%, 34%) |
| OKLCH | oklch(47.7% 0.044 219.6) |
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 #40636E | 6.50:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #40636E | 3.22:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #40636E text on white | 6.50:1 | AA | Lc 82.2 | Fine for body text |
| #40636E text on black | 3.22:1 | AA large text | Lc -19.7 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B2C4CA
oklch(80.8% 0.021 219.7)
-
Step 400
400
#8AA6AF
oklch(70.7% 0.034 219.2)
-
Step 500
500
#6C909C
oklch(63.1% 0.044 220.4)
-
Step 600
600
#547A86
oklch(55.6% 0.046 219.5)
-
Step 700
700 (this color)
#40636E
oklch(47.7% 0.044 219.6)
-
Step 800
800
#38545D
oklch(42.7% 0.037 220)
-
Step 900
900
#31454C
oklch(37.6% 0.028 221.5)
-
Step 950
950
#1D292C
oklch(27.1% 0.017 214.8)
#40636E 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) | #5C616F | 0.038 |
| Deuteranopia (no green cones) | #555B6E | 0.035 |
| Tritanopia (no blue cones) | #2E6766 | 0.028 |
| Achromatopsia (no color) | #5E5E5E | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40636E
#40636E
oklch(47.7% 0.044 219.6)
- #73554A
#73554A
oklch(47.8% 0.044 41)
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 #40636E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.024
- YInMn Blue #415A77 ΔE 0.036
- Dark Aqua #05696B ΔE 0.042
- Petrol #005F6A ΔE 0.048
- Dusty Grape #545775 ΔE 0.048
- Denim #3B638C ΔE 0.049
- Dark Green Blue #1F6357 ΔE 0.052
- Deep Turquoise #017374 ΔE 0.055
Use #40636E 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.