#373A42
Closest named color: Onyx (#343A40). oklch(34.9% 0.015 269.3), rgb(55, 58, 66).
Aa
White text reads best on this color (11.37:1).
About this color
#373A42 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.006 away. White text reads best on it, at 11.37:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #373A42 |
| RGB | rgb(55, 58, 66) |
| HSL | hsl(224, 9%, 24%) |
| OKLCH | oklch(34.9% 0.015 269.3) |
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 #373A42 | 11.37:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #373A42 | 1.84:1 | Fails | Lc 7.6 | Not readable |
| #373A42 text on white | 11.37:1 | AAA | Lc 96.3 | Preferred for body text |
| #373A42 text on black | 1.84:1 | 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
#D7D9DD
oklch(88.5% 0.006 264.5)
-
Step 300
300
#BEC0C8
oklch(80.9% 0.011 274.9)
-
Step 400
400
#9CA0AC
oklch(70.6% 0.018 271.2)
-
Step 500
500
#848997
oklch(63.1% 0.022 270.1)
-
Step 600
600
#6D7382
oklch(55.6% 0.024 268.2)
-
Step 700
700
#5B606E
oklch(49% 0.023 269.9)
-
Step 800
800
#4B4F5A
oklch(42.8% 0.019 269.7)
-
Step 900
900 (this color)
#373A42
oklch(34.9% 0.015 269.3)
-
Step 950
950
#25262B
oklch(27% 0.009 276.8)
#373A42 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) | #383B42 | 0.004 |
| Deuteranopia (no green cones) | #373A42 | 0.000 |
| Tritanopia (no blue cones) | #353B3D | 0.011 |
| Achromatopsia (no color) | #3A3A3A | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
This color is close to neutral, so it has no meaningful hue to rotate. Hue harmonies are omitted.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #373A42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.006
- Charcoal Grey #3C4142 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Charcoal #264653 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.050
- Midnight Green #073B4C ΔE 0.053
Use #373A42 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.