#283F3E
Closest named color: Onyx (#343A40). oklch(34.8% 0.029 192.5), rgb(40, 63, 62).
Aa
White text reads best on this color (11.22:1).
About this color
#283F3E is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.024 away. White text reads best on it, at 11.22:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.22:1 |
Values
| HEX | #283F3E |
| RGB | rgb(40, 63, 62) |
| HSL | hsl(177, 22%, 20%) |
| OKLCH | oklch(34.8% 0.029 192.5) |
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 #283F3E | 11.22:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #283F3E | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #283F3E text on white | 11.22:1 | AAA | Lc 95.9 | Preferred for body text |
| #283F3E text on black | 1.87:1 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D1DCDB
oklch(88.6% 0.012 190.4)
-
Step 300
300
#B2C5C4
oklch(80.9% 0.021 192.9)
-
Step 400
400
#88A8A6
oklch(70.7% 0.035 191.7)
-
Step 500
500
#6A9290
oklch(63% 0.044 192.2)
-
Step 600
600
#517D7B
oklch(55.7% 0.049 192.2)
-
Step 700
700
#426967
oklch(49.1% 0.044 191.7)
-
Step 800
800
#365654
oklch(42.8% 0.038 190.8)
-
Step 900
900 (this color)
#283F3E
oklch(34.8% 0.029 192.5)
-
Step 950
950
#1C2929
oklch(26.9% 0.018 196.1)
#283F3E 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) | #3C3D3E | 0.030 |
| Deuteranopia (no green cones) | #383A3E | 0.027 |
| Tritanopia (no blue cones) | #20403F | 0.009 |
| Achromatopsia (no color) | #3B3B3B | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F3E
#283F3E
oklch(34.8% 0.029 192.5)
- #483436
#483436
oklch(34.8% 0.029 12)
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 #283F3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.024
- Charcoal Grey #3C4142 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.035
- Charcoal #264653 ΔE 0.037
- Midnight Green #073B4C ΔE 0.043
- Gunmetal #293241 ΔE 0.046
- Dark Teal #014D4E ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
Use #283F3E 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.