#37333D
Closest named color: Onyx (#343A40). oklch(32.9% 0.018 303.6), rgb(55, 51, 61).
Aa
White text reads best on this color (12.32:1).
About this color
#37333D is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.022 away. White text reads best on it, at 12.32:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.70:1 |
| White text | 12.32:1 |
Values
| HEX | #37333D |
| RGB | rgb(55, 51, 61) |
| HSL | hsl(264, 9%, 22%) |
| OKLCH | oklch(32.9% 0.018 303.6) |
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 #37333D | 12.32:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #37333D | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #37333D text on white | 12.32:1 | AAA | Lc 98.1 | Preferred for body text |
| #37333D text on black | 1.70:1 | 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
#F6F5F6
oklch(97.1% 0.002 325.6)
-
Step 100
100
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#DAD8DD
oklch(88.5% 0.007 304.2)
-
Step 300
300
#C2BFC8
oklch(81% 0.013 301.2)
-
Step 400
400
#A39DAC
oklch(70.6% 0.023 303.9)
-
Step 500
500
#8D8698
oklch(63.2% 0.028 303.2)
-
Step 600
600
#776F82
oklch(55.6% 0.03 304.5)
-
Step 700
700
#645D6E
oklch(49.1% 0.028 304)
-
Step 800
800
#514C5A
oklch(42.7% 0.024 301.7)
-
Step 900
900 (this color)
#37333D
oklch(32.9% 0.018 303.6)
-
Step 950
950
#28252B
oklch(27% 0.012 308)
#37333D 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) | #31353D | 0.012 |
| Deuteranopia (no green cones) | #32353D | 0.010 |
| Tritanopia (no blue cones) | #363436 | 0.014 |
| Achromatopsia (no color) | #353535 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37333D
#37333D
oklch(32.9% 0.018 303.6)
- #33372D
#33372D
oklch(33% 0.018 125.1)
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 #37333D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Gunmetal #293241 ΔE 0.025
- Space Cadet #2B2D42 ΔE 0.033
- Dark Blue Grey #1F3B4D ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.057
- Midnight Green #073B4C ΔE 0.058
- Charcoal #264653 ΔE 0.063
Use #37333D 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.