#2A4043
Closest named color: Onyx (#343A40). oklch(35.4% 0.028 206.6), rgb(42, 64, 67).
Aa
White text reads best on this color (10.97:1).
About this color
#2A4043 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 0.022 away. White text reads best on it, at 10.97:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #2A4043 |
| RGB | rgb(42, 64, 67) |
| HSL | hsl(187, 23%, 21%) |
| OKLCH | oklch(35.4% 0.028 206.6) |
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 #2A4043 | 10.97:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #2A4043 | 1.91:1 | Fails | Lc 8.5 | Not readable |
| #2A4043 text on white | 10.97:1 | AAA | Lc 95.4 | Preferred for body text |
| #2A4043 text on black | 1.91:1 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDD
oklch(88.4% 0.011 211)
-
Step 300
300
#B2C5C7
oklch(81% 0.021 204.4)
-
Step 400
400
#89A7AB
oklch(70.7% 0.034 206.4)
-
Step 500
500
#6B9196
oklch(63% 0.043 206.2)
-
Step 600
600
#527B81
oklch(55.5% 0.046 207.4)
-
Step 700
700
#42686D
oklch(49.1% 0.044 206.3)
-
Step 800
800
#375559
oklch(42.8% 0.036 206.4)
-
Step 900
900 (this color)
#2A4043
oklch(35.4% 0.028 206.6)
-
Step 950
950
#1C292B
oklch(27% 0.018 207.9)
#2A4043 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) | #3D3E43 | 0.028 |
| Deuteranopia (no green cones) | #383B43 | 0.025 |
| Tritanopia (no blue cones) | #214241 | 0.013 |
| Achromatopsia (no color) | #3C3C3C | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4043
#2A4043
oklch(35.4% 0.028 206.6)
- #493634
#493634
oklch(35.4% 0.028 25.4)
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 #2A4043, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Charcoal Grey #3C4142 ΔE 0.027
- Charcoal #264653 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.041
- Midnight Green #073B4C ΔE 0.042
- Dark Teal #014D4E ΔE 0.046
- Gunmetal #293241 ΔE 0.047
Use #2A4043 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.