#283A39
Closest named color: Onyx (#343A40). oklch(33.3% 0.023 191.8), rgb(40, 58, 57).
Aa
White text reads best on this color (11.96:1).
About this color
#283A39 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.023 away. White text reads best on it, at 11.96:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.75:1 |
| White text | 11.96:1 |
Values
| HEX | #283A39 |
| RGB | rgb(40, 58, 57) |
| HSL | hsl(177, 18%, 19%) |
| OKLCH | oklch(33.3% 0.023 191.8) |
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 #283A39 | 11.96:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #283A39 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #283A39 text on white | 11.96:1 | AAA | Lc 97.4 | Preferred for body text |
| #283A39 text on black | 1.75:1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D2DBDB
oklch(88.5% 0.01 197)
-
Step 300
300
#B4C4C3
oklch(80.8% 0.018 192.3)
-
Step 400
400
#8DA6A5
oklch(70.6% 0.028 193.6)
-
Step 500
500
#71918F
oklch(63.2% 0.036 191.5)
-
Step 600
600
#597B79
oklch(55.6% 0.039 191.5)
-
Step 700
700
#496766
oklch(49% 0.035 193.5)
-
Step 800
800
#3C5453
oklch(42.6% 0.029 192.9)
-
Step 900
900 (this color)
#283A39
oklch(33.3% 0.023 191.8)
-
Step 950
950
#1E2928
oklch(27% 0.015 189.4)
#283A39 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) | #383839 | 0.025 |
| Deuteranopia (no green cones) | #343639 | 0.022 |
| Tritanopia (no blue cones) | #223B3A | 0.008 |
| Achromatopsia (no color) | #373737 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A39
#283A39
oklch(33.3% 0.023 191.8)
- #413133
#413133
oklch(33.2% 0.023 10)
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 #283A39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.023
- Gunmetal #293241 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.035
- Midnight Green #073B4C ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.042
- Charcoal #264653 ΔE 0.051
- Pakistan Green #283618 ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.052
Use #283A39 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.