#37333B
Closest named color: Onyx (#343A40). oklch(32.8% 0.015 308), rgb(55, 51, 59).
Aa
White text reads best on this color (12.35:1).
About this color
#37333B is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.015. 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 12.35:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.69:1 |
| White text | 12.35:1 |
Values
| HEX | #37333B |
| RGB | rgb(55, 51, 59) |
| HSL | hsl(270, 7%, 22%) |
| OKLCH | oklch(32.8% 0.015 308) |
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 #37333B | 12.35:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #37333B | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #37333B text on white | 12.35:1 | AAA | Lc 98.2 | Preferred for body text |
| #37333B text on black | 1.69:1 | 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
#EAE9EB
oklch(93.5% 0.003 308.4)
-
Step 200
200
#DAD8DC
oklch(88.5% 0.006 308.4)
-
Step 300
300
#C2BFC6
oklch(80.9% 0.01 305.4)
-
Step 400
400
#A49EA9
oklch(70.8% 0.017 310)
-
Step 500
500
#8D8694
oklch(63.1% 0.022 308.1)
-
Step 600
600
#77707F
oklch(55.7% 0.024 306.6)
-
Step 700
700
#645D6B
oklch(49% 0.024 307.9)
-
Step 800
800
#524C57
oklch(42.6% 0.019 309.8)
-
Step 900
900 (this color)
#37333B
oklch(32.8% 0.015 308)
-
Step 950
950
#28252A
oklch(27% 0.01 312.1)
#37333B 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) | #32343B | 0.009 |
| Deuteranopia (no green cones) | #33353B | 0.009 |
| Tritanopia (no blue cones) | #373436 | 0.011 |
| Achromatopsia (no color) | #343434 | 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 #37333B, 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 0.026
- Space Cadet #2B2D42 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.046
- Midnight Green #073B4C ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.059
- Charcoal #264653 ΔE 0.064
Use #37333B 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.