#353740
Closest named color: Onyx (#343A40). oklch(33.8% 0.016 275.6), rgb(53, 55, 64).
Aa
White text reads best on this color (11.85:1).
About this color
#353740 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.010 away. White text reads best on it, at 11.85:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.77:1 |
| White text | 11.85:1 |
Values
| HEX | #353740 |
| RGB | rgb(53, 55, 64) |
| HSL | hsl(229, 9%, 23%) |
| OKLCH | oklch(33.8% 0.016 275.6) |
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 #353740 | 11.85:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #353740 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #353740 text on white | 11.85:1 | AAA | Lc 97.2 | Preferred for body text |
| #353740 text on black | 1.77:1 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E9EAEC
oklch(93.7% 0.003 264.5)
-
Step 200
200
#D8D9DE
oklch(88.6% 0.007 277.2)
-
Step 300
300
#BEC0C9
oklch(80.9% 0.013 276.1)
-
Step 400
400
#9DA0AD
oklch(70.7% 0.019 275.5)
-
Step 500
500
#858999
oklch(63.2% 0.024 274.5)
-
Step 600
600
#6F7283
oklch(55.5% 0.027 277.6)
-
Step 700
700
#5C606F
oklch(49.1% 0.024 273.7)
-
Step 800
800
#4C4E5B
oklch(42.7% 0.022 278.5)
-
Step 900
900 (this color)
#353740
oklch(33.8% 0.016 275.6)
-
Step 950
950
#25262B
oklch(27% 0.009 276.8)
#353740 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) | #353840 | 0.003 |
| Deuteranopia (no green cones) | #343740 | 0.002 |
| Tritanopia (no blue cones) | #33393A | 0.015 |
| Achromatopsia (no color) | #373737 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #353740
#353740
oklch(33.8% 0.016 275.6)
- #3A382E
#3A382E
oklch(33.9% 0.017 97.9)
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 #353740, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.010
- Gunmetal #293241 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.036
- Space Cadet #2B2D42 ΔE 0.040
- Midnight Green #073B4C ΔE 0.051
- Charcoal #264653 ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.054
Use #353740 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.