#2B3840
Closest named color: Onyx (#343A40). oklch(33.2% 0.022 235.4), rgb(43, 56, 64).
Aa
White text reads best on this color (12.05:1).
About this color
#2B3840 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.016 away. White text reads best on it, at 12.05:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.74:1 |
| White text | 12.05:1 |
Values
| HEX | #2B3840 |
| RGB | rgb(43, 56, 64) |
| HSL | hsl(203, 20%, 21%) |
| OKLCH | oklch(33.2% 0.022 235.4) |
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 #2B3840 | 12.05:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #2B3840 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #2B3840 text on white | 12.05:1 | AAA | Lc 97.6 | Preferred for body text |
| #2B3840 text on black | 1.74:1 | 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
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B7C3CA
oklch(81% 0.017 233.1)
-
Step 400
400
#91A4AF
oklch(70.7% 0.027 233.2)
-
Step 500
500
#768D9C
oklch(63.1% 0.035 236.7)
-
Step 600
600
#5F7786
oklch(55.6% 0.037 235.7)
-
Step 700
700
#4E6472
oklch(49.1% 0.035 236.3)
-
Step 800
800
#40525D
oklch(42.8% 0.029 235.2)
-
Step 900
900 (this color)
#2B3840
oklch(33.2% 0.022 235.4)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#2B3840 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) | #343840 | 0.014 |
| Deuteranopia (no green cones) | #313540 | 0.013 |
| Tritanopia (no blue cones) | #253A3B | 0.016 |
| Achromatopsia (no color) | #363636 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3840
#2B3840
oklch(33.2% 0.022 235.4)
- #3F332B
#3F332B
oklch(33.2% 0.022 55.5)
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 #2B3840, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.016
- Gunmetal #293241 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.025
- Midnight Green #073B4C ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.048
- Charcoal #264653 ΔE 0.048
Use #2B3840 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.