#283740
Closest named color: Gunmetal (#293241). oklch(32.7% 0.025 234.9), rgb(40, 55, 64).
Aa
White text reads best on this color (12.27:1).
About this color
#283740 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Gunmetal (#293241), ΔE 0.018 away. White text reads best on it, at 12.27:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.71:1 |
| White text | 12.27:1 |
Values
| HEX | #283740 |
| RGB | rgb(40, 55, 64) |
| HSL | hsl(203, 23%, 20%) |
| OKLCH | oklch(32.7% 0.025 234.9) |
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 #283740 | 12.27:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #283740 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #283740 text on white | 12.27:1 | AAA | Lc 98.0 | Preferred for body text |
| #283740 text on black | 1.71:1 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAED
oklch(93.5% 0.006 239.8)
-
Step 200
200
#D3DADF
oklch(88.4% 0.01 238.5)
-
Step 300
300
#B5C3CB
oklch(80.9% 0.019 232.6)
-
Step 400
400
#8FA4B1
oklch(70.7% 0.03 235.1)
-
Step 500
500
#738E9E
oklch(63.2% 0.039 234.2)
-
Step 600
600
#5B7889
oklch(55.7% 0.043 234.3)
-
Step 700
700
#4B6574
oklch(49.2% 0.039 233.9)
-
Step 800
800
#3E525E
oklch(42.7% 0.032 234.8)
-
Step 900
900 (this color)
#283740
oklch(32.7% 0.025 234.9)
-
Step 950
950
#1F282D
oklch(27% 0.016 232.4)
#283740 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) | #333740 | 0.017 |
| Deuteranopia (no green cones) | #2F3440 | 0.014 |
| Tritanopia (no blue cones) | #20393A | 0.018 |
| Achromatopsia (no color) | #353535 | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283740
#283740
oklch(32.7% 0.025 234.9)
- #3F3128
#3F3128
oklch(32.6% 0.026 54.3)
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 #283740, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.018
- Onyx #343A40 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.024
- Midnight Green #073B4C ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.035
- Prussian Blue #1D3557 ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.048
- Charcoal #264653 ΔE 0.052
Use #283740 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.