#2B403B
Closest named color: Onyx (#343A40). oklch(35.2% 0.028 178.2), rgb(43, 64, 59).
Aa
White text reads best on this color (11.05:1).
About this color
#2B403B is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.027 away. White text reads best on it, at 11.05:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #2B403B |
| RGB | rgb(43, 64, 59) |
| HSL | hsl(166, 20%, 21%) |
| OKLCH | oklch(35.2% 0.028 178.2) |
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 #2B403B | 11.05:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #2B403B | 1.89:1 | Fails | Lc 8.3 | Not readable |
| #2B403B text on white | 11.05:1 | AAA | Lc 95.6 | Preferred for body text |
| #2B403B text on black | 1.89:1 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D1DCD9
oklch(88.5% 0.013 178)
-
Step 300
300
#B3C5C0
oklch(80.8% 0.021 177.3)
-
Step 400
400
#8BA8A0
oklch(70.7% 0.034 176.7)
-
Step 500
500
#6E9289
oklch(63% 0.042 177.8)
-
Step 600
600
#557D73
oklch(55.7% 0.047 177.1)
-
Step 700
700
#456961
oklch(49.1% 0.043 178.9)
-
Step 800
800
#39564F
oklch(42.8% 0.037 177.7)
-
Step 900
900 (this color)
#2B403B
oklch(35.2% 0.028 178.2)
-
Step 950
950
#1D2926
oklch(26.9% 0.017 177.9)
#2B403B 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) | #3E3E3B | 0.029 |
| Deuteranopia (no green cones) | #3B3B3B | 0.028 |
| Tritanopia (no blue cones) | #25413E | 0.008 |
| Achromatopsia (no color) | #3C3C3C | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B403B
#2B403B
oklch(35.2% 0.028 178.2)
- #48353B
#48353B
oklch(35.2% 0.029 357.9)
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 #2B403B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.029
- Charcoal #264653 ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.043
- Dark Teal #014D4E ΔE 0.049
- Midnight Green #073B4C ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.053
- Gunmetal #293241 ΔE 0.053
Use #2B403B 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.