#31403F
Closest named color: Charcoal Grey (#3C4142). oklch(35.8% 0.02 191.3), rgb(49, 64, 63).
Aa
White text reads best on this color (10.84:1).
About this color
#31403F is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.019 away. White text reads best on it, at 10.84:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #31403F |
| RGB | rgb(49, 64, 63) |
| HSL | hsl(176, 13%, 22%) |
| OKLCH | oklch(35.8% 0.02 191.3) |
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 #31403F | 10.84:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #31403F | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #31403F text on white | 10.84:1 | AAA | Lc 95.1 | Preferred for body text |
| #31403F text on black | 1.93:1 | Fails | Lc -7.5 | 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
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D3DBDA
oklch(88.5% 0.009 188.1)
-
Step 300
300
#B6C4C3
oklch(80.9% 0.015 191.7)
-
Step 400
400
#91A6A4
oklch(70.8% 0.024 189.6)
-
Step 500
500
#75908E
oklch(63.2% 0.031 190.9)
-
Step 600
600
#5E7A78
oklch(55.7% 0.032 190.8)
-
Step 700
700
#4D6665
oklch(49% 0.03 193.2)
-
Step 800
800
#3F5452
oklch(42.8% 0.026 189)
-
Step 900
900 (this color)
#31403F
oklch(35.8% 0.02 191.3)
-
Step 950
950
#202828
oklch(26.9% 0.011 196.5)
#31403F 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) | #3E3E3F | 0.021 |
| Deuteranopia (no green cones) | #3B3C3F | 0.019 |
| Tritanopia (no blue cones) | #2D4140 | 0.006 |
| Achromatopsia (no color) | #3D3D3D | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31403F
#31403F
oklch(35.8% 0.02 191.3)
- #46393A
#46393A
oklch(35.9% 0.018 12.8)
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 #31403F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.019
- Onyx #343A40 ΔE 0.021
- Charcoal #264653 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.049
- Dark Teal #014D4E ΔE 0.051
- Gunmetal #293241 ΔE 0.052
Use #31403F 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.