#2C3F37
Closest named color: Onyx (#343A40). oklch(34.9% 0.028 166.9), rgb(44, 63, 55).
Aa
White text reads best on this color (11.21:1).
About this color
#2C3F37 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 0.029 away. White text reads best on it, at 11.21:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #2C3F37 |
| RGB | rgb(44, 63, 55) |
| HSL | hsl(155, 18%, 21%) |
| OKLCH | oklch(34.9% 0.028 166.9) |
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 #2C3F37 | 11.21:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #2C3F37 | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #2C3F37 text on white | 11.21:1 | AAA | Lc 95.9 | Preferred for body text |
| #2C3F37 text on black | 1.87:1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E6EBE9
oklch(93.6% 0.006 170.4)
-
Step 200
200
#D2DCD7
oklch(88.5% 0.013 164.8)
-
Step 300
300
#B4C5BE
oklch(80.8% 0.021 169.2)
-
Step 400
400
#8DA89C
oklch(70.7% 0.035 166.7)
-
Step 500
500
#719284
oklch(63.1% 0.043 167.2)
-
Step 600
600
#597C6D
oklch(55.5% 0.046 166.4)
-
Step 700
700
#48695B
oklch(49.1% 0.044 166.4)
-
Step 800
800
#3C564B
oklch(42.9% 0.036 166.6)
-
Step 900
900 (this color)
#2C3F37
oklch(34.9% 0.028 166.9)
-
Step 950
950
#1E2925
oklch(26.9% 0.017 170.8)
#2C3F37 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) | #3E3C37 | 0.029 |
| Deuteranopia (no green cones) | #3B3A37 | 0.027 |
| Tritanopia (no blue cones) | #283F3D | 0.011 |
| Achromatopsia (no color) | #3B3B3B | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C3F37
#2C3F37
oklch(34.9% 0.028 166.9)
- #45343D
#45343D
oklch(34.7% 0.028 345.6)
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 #2C3F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.033
- Charcoal #264653 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.047
- Pakistan Green #283618 ΔE 0.051
- Evergreen #05472A ΔE 0.052
- Dark Teal #014D4E ΔE 0.053
- Gunmetal #293241 ΔE 0.054
Use #2C3F37 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.