#40535F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.1% 0.031 236.2), rgb(64, 83, 95).
Aa
White text reads best on this color (8.01:1).
About this color
#40535F is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.031 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.037 away. White text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.62:1 |
| White text | 8.01:1 |
Values
| HEX | #40535F |
| RGB | rgb(64, 83, 95) |
| HSL | hsl(203, 19%, 31%) |
| OKLCH | oklch(43.1% 0.031 236.2) |
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 #40535F | 8.01:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #40535F | 2.62:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #40535F text on white | 8.01:1 | AAA | Lc 87.8 | Fine for body text |
| #40535F text on black | 2.62:1 | Fails | Lc -14.4 | Not readable |
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 800.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D3DADF
oklch(88.4% 0.01 238.5)
-
Step 300
300
#B6C3CB
oklch(81% 0.018 234.6)
-
Step 400
400
#90A4B0
oklch(70.7% 0.029 234.2)
-
Step 500
500
#758D9D
oklch(63% 0.037 237.4)
-
Step 600
600
#5D7788
oklch(55.5% 0.04 237.1)
-
Step 700
700
#4D6473
oklch(49% 0.037 237.1)
-
Step 800
800 (this color)
#40535F
oklch(43.1% 0.031 236.2)
-
Step 900
900
#36444D
oklch(37.8% 0.024 236.5)
-
Step 950
950
#1F282D
oklch(27% 0.016 232.4)
#40535F 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) | #4E5260 | 0.021 |
| Deuteranopia (no green cones) | #494F5F | 0.017 |
| Tritanopia (no blue cones) | #365657 | 0.023 |
| Achromatopsia (no color) | #505050 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40535F
#40535F
oklch(43.1% 0.031 236.2)
- #5E4C40
#5E4C40
oklch(43.2% 0.031 55.4)
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 #40535F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.037
- YInMn Blue #415A77 ΔE 0.040
- Dusty Grape #545775 ΔE 0.049
- Deep Teal #00555A ΔE 0.052
- Petrol #005F6A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
- Charcoal #264653 ΔE 0.058
- Dusk #4E5481 ΔE 0.062
Use #40535F 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.