#37313B
Closest named color: Gunmetal (#293241). oklch(32.3% 0.019 311.9), rgb(55, 49, 59).
Aa
White text reads best on this color (12.61:1).
About this color
#37313B is a dark close to neutral grey. In OKLCH its lightness is 32%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Gunmetal (#293241), ΔE 0.025 away. White text reads best on it, at 12.61:1.
| Hue family | Neutrals |
| Lightness | dark (32%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.66:1 |
| White text | 12.61:1 |
Values
| HEX | #37313B |
| RGB | rgb(55, 49, 59) |
| HSL | hsl(276, 9%, 21%) |
| OKLCH | oklch(32.3% 0.019 311.9) |
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 #37313B | 12.61:1 | AAA | Lc -102.0 | Preferred for body text |
| Black text on #37313B | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #37313B text on white | 12.61:1 | AAA | Lc 98.6 | Preferred for body text |
| #37313B text on black | 1.66:1 | 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 950.
-
Step 50
50
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#EBE9ED
oklch(93.7% 0.006 308.4)
-
Step 200
200
#DCD7DF
oklch(88.5% 0.012 313.2)
-
Step 300
300
#C5BDCC
oklch(80.9% 0.023 309.5)
-
Step 400
400
#A89AB1
oklch(70.6% 0.037 312.3)
-
Step 500
500
#93829E
oklch(63.1% 0.046 312.1)
-
Step 600
600
#7D6B89
oklch(55.6% 0.05 311.7)
-
Step 700
700
#6A5974
oklch(49.1% 0.047 312.9)
-
Step 800
800
#56495F
oklch(42.7% 0.039 311.3)
-
Step 900
900
#473D4E
oklch(37.7% 0.031 311.3)
-
Step 950
950 (this color)
#37313B
oklch(32.3% 0.019 311.9)
#37313B 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) | #30333B | 0.013 |
| Deuteranopia (no green cones) | #31333B | 0.012 |
| Tritanopia (no blue cones) | #373234 | 0.014 |
| Achromatopsia (no color) | #333333 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37313B
#37313B
oklch(32.3% 0.019 311.9)
- #30362C
#30362C
oklch(32.4% 0.019 132.8)
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 #37313B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.025
- Onyx #343A40 ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.059
- Midnight Green #073B4C ΔE 0.061
- Oxford Blue #1B263B ΔE 0.064
Use #37313B 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.