#2A3F3F
Closest named color: Onyx (#343A40). oklch(35% 0.026 196), rgb(42, 63, 63).
Aa
White text reads best on this color (11.16:1).
About this color
#2A3F3F is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.026. 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 11.16:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.88:1 |
| White text | 11.16:1 |
Values
| HEX | #2A3F3F |
| RGB | rgb(42, 63, 63) |
| HSL | hsl(180, 20%, 21%) |
| OKLCH | oklch(35% 0.026 196) |
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 #2A3F3F | 11.16:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #2A3F3F | 1.88:1 | Fails | Lc 8.1 | Not readable |
| #2A3F3F text on white | 11.16:1 | AAA | Lc 95.8 | Preferred for body text |
| #2A3F3F text on black | 1.88:1 | 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
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D1DBDB
oklch(88.4% 0.011 197)
-
Step 300
300
#B3C5C5
oklch(81% 0.02 196.8)
-
Step 400
400
#8AA7A7
oklch(70.7% 0.032 196.4)
-
Step 500
500
#6D9191
oklch(63% 0.04 196.2)
-
Step 600
600
#547C7C
oklch(55.7% 0.045 195.9)
-
Step 700
700
#446868
oklch(49% 0.041 195.9)
-
Step 800
800
#385555
oklch(42.7% 0.035 195.9)
-
Step 900
900 (this color)
#2A3F3F
oklch(35% 0.026 196)
-
Step 950
950
#1D2929
oklch(27% 0.017 196.2)
#2A3F3F 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) | #3C3D3F | 0.027 |
| Deuteranopia (no green cones) | #383A3F | 0.025 |
| Tritanopia (no blue cones) | #22403F | 0.010 |
| Achromatopsia (no color) | #3B3B3B | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3F3F
#2A3F3F
oklch(35% 0.026 196)
- #473536
#473536
oklch(34.9% 0.026 14.8)
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 #2A3F3F, 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 0.029
- Dark Blue Grey #1F3B4D ΔE 0.034
- Charcoal #264653 ΔE 0.035
- Midnight Green #073B4C ΔE 0.043
- Gunmetal #293241 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.048
- Dark Teal #014D4E ΔE 0.049
Use #2A3F3F 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.