#40353A
Closest named color: Onyx (#343A40). oklch(34.3% 0.018 348.9), rgb(64, 53, 58).
Aa
White text reads best on this color (11.74:1).
About this color
#40353A is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.024 away. White text reads best on it, at 11.74:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #40353A |
| RGB | rgb(64, 53, 58) |
| HSL | hsl(333, 9%, 23%) |
| OKLCH | oklch(34.3% 0.018 348.9) |
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 #40353A | 11.74:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #40353A | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #40353A text on white | 11.74:1 | AAA | Lc 97.0 | Preferred for body text |
| #40353A text on black | 1.78:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F6F5F5
oklch(97.1% 0.001 17.2)
-
Step 100
100
#ECE9EA
oklch(93.7% 0.003 354.7)
-
Step 200
200
#DDD7DA
oklch(88.5% 0.008 345.4)
-
Step 300
300
#C8BDC2
oklch(80.9% 0.014 348)
-
Step 400
400
#AB9BA3
oklch(70.6% 0.022 345.9)
-
Step 500
500
#97838C
oklch(63.1% 0.027 349)
-
Step 600
600
#816D76
oklch(55.7% 0.028 349.2)
-
Step 700
700
#6D5B63
oklch(49.2% 0.026 349.5)
-
Step 800
800
#594A51
oklch(42.7% 0.023 348.3)
-
Step 900
900 (this color)
#40353A
oklch(34.3% 0.018 348.9)
-
Step 950
950
#2B2427
oklch(26.9% 0.012 350.2)
#40353A 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) | #36373A | 0.018 |
| Deuteranopia (no green cones) | #38393A | 0.018 |
| Tritanopia (no blue cones) | #423537 | 0.006 |
| Achromatopsia (no color) | #383838 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40353A
#40353A
oklch(34.3% 0.018 348.9)
- #303C37
#303C37
oklch(34.4% 0.018 168.1)
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 #40353A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.024
- Charcoal Grey #3C4142 ΔE 0.037
- Gunmetal #293241 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal #264653 ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.070
- Midnight Green #073B4C ΔE 0.071
Use #40353A 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.