#2A3738
Closest named color: Onyx (#343A40). oklch(32.5% 0.017 202.1), rgb(42, 55, 56).
Aa
White text reads best on this color (12.33:1).
About this color
#2A3738 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.017. 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 12.33:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.70:1 |
| White text | 12.33:1 |
Values
| HEX | #2A3738 |
| RGB | rgb(42, 55, 56) |
| HSL | hsl(184, 14%, 19%) |
| OKLCH | oklch(32.5% 0.017 202.1) |
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 #2A3738 | 12.33:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #2A3738 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #2A3738 text on white | 12.33:1 | AAA | Lc 98.1 | Preferred for body text |
| #2A3738 text on black | 1.70:1 | 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
#E7EBEB
oklch(93.7% 0.004 197.1)
-
Step 200
200
#D4DBDB
oklch(88.6% 0.008 197)
-
Step 300
300
#B7C3C4
oklch(80.8% 0.013 202.9)
-
Step 400
400
#92A5A6
oklch(70.7% 0.021 200.5)
-
Step 500
500
#778F90
oklch(63.2% 0.027 199.6)
-
Step 600
600
#60797B
oklch(55.7% 0.029 202.4)
-
Step 700
700
#4F6567
oklch(49% 0.027 203.2)
-
Step 800
800
#415354
oklch(42.7% 0.022 200.5)
-
Step 900
900 (this color)
#2A3738
oklch(32.5% 0.017 202.1)
-
Step 950
950
#202829
oklch(27% 0.011 205.8)
#2A3738 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) | #353638 | 0.017 |
| Deuteranopia (no green cones) | #323438 | 0.015 |
| Tritanopia (no blue cones) | #263837 | 0.007 |
| Achromatopsia (no color) | #353535 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3738
#2A3738
oklch(32.5% 0.017 202.1)
- #3D3130
#3D3130
oklch(32.6% 0.018 23.7)
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 #2A3738, 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 0.027
- Dark Blue Grey #1F3B4D ΔE 0.037
- Space Cadet #2B2D42 ΔE 0.043
- Midnight Green #073B4C ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.047
- Pakistan Green #283618 ΔE 0.052
- Charcoal #264653 ΔE 0.058
Use #2A3738 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.