#2D3A3F
Closest named color: Onyx (#343A40). oklch(33.9% 0.019 223.3), rgb(45, 58, 63).
Aa
White text reads best on this color (11.74:1).
About this color
#2D3A3F is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.011 away. White text reads best on it, at 11.74:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.78:1 |
| White text | 11.74:1 |
Values
| HEX | #2D3A3F |
| RGB | rgb(45, 58, 63) |
| HSL | hsl(197, 17%, 21%) |
| OKLCH | oklch(33.9% 0.019 223.3) |
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 #2D3A3F | 11.74:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #2D3A3F | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #2D3A3F text on white | 11.74:1 | AAA | Lc 97.0 | Preferred for body text |
| #2D3A3F text on black | 1.78:1 | 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
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADD
oklch(88.5% 0.008 228.9)
-
Step 300
300
#B7C3C7
oklch(80.9% 0.014 219.6)
-
Step 400
400
#92A4AB
oklch(70.7% 0.023 223.1)
-
Step 500
500
#778E97
oklch(63.2% 0.03 223.5)
-
Step 600
600
#5F7881
oklch(55.6% 0.032 221.8)
-
Step 700
700
#4F656D
oklch(49.2% 0.029 222.1)
-
Step 800
800
#415259
oklch(42.7% 0.024 224.9)
-
Step 900
900 (this color)
#2D3A3F
oklch(33.9% 0.019 223.3)
-
Step 950
950
#20282B
oklch(27% 0.013 222.5)
#2D3A3F 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) | #37393F | 0.016 |
| Deuteranopia (no green cones) | #34373F | 0.014 |
| Tritanopia (no blue cones) | #283C3C | 0.012 |
| Achromatopsia (no color) | #383838 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3A3F
#2D3A3F
oklch(33.9% 0.019 223.3)
- #413530
#413530
oklch(34% 0.019 43.9)
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 #2D3A3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.011
- Dark Blue Grey #1F3B4D ΔE 0.028
- Gunmetal #293241 ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.035
- Midnight Green #073B4C ΔE 0.041
- Charcoal #264653 ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.053
Use #2D3A3F 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.