#31434B
Closest named color: Charcoal (#264653). oklch(37.1% 0.027 227), rgb(49, 67, 75).
Aa
White text reads best on this color (10.31:1).
About this color
#31434B is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Charcoal (#264653), ΔE 0.018 away. White text reads best on it, at 10.31:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Charcoal (#264653) |
| Black text | 2.03:1 |
| White text | 10.31:1 |
Values
| HEX | #31434B |
| RGB | rgb(49, 67, 75) |
| HSL | hsl(198, 21%, 24%) |
| OKLCH | oklch(37.1% 0.027 227) |
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 #31434B | 10.31:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #31434B | 2.03:1 | Fails | Lc 10.0 | Not readable |
| #31434B text on white | 10.31:1 | AAA | Lc 93.9 | Preferred for body text |
| #31434B text on black | 2.03:1 | Fails | Lc -8.6 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D2DBDF
oklch(88.6% 0.011 226)
-
Step 300
300
#B4C4CB
oklch(81% 0.02 225.8)
-
Step 400
400
#8CA5B0
oklch(70.6% 0.032 226.2)
-
Step 500
500
#708F9D
oklch(63.1% 0.041 227.2)
-
Step 600
600
#577988
oklch(55.6% 0.045 227.1)
-
Step 700
700
#476673
oklch(49.1% 0.042 225.9)
-
Step 800
800
#3B535E
oklch(42.7% 0.034 228)
-
Step 900
900 (this color)
#31434B
oklch(37.1% 0.027 227)
-
Step 950
950
#1E282D
oklch(27% 0.017 229.8)
#31434B 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) | #3F424B | 0.021 |
| Deuteranopia (no green cones) | #3B3F4B | 0.019 |
| Tritanopia (no blue cones) | #284545 | 0.019 |
| Achromatopsia (no color) | #404040 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31434B
#31434B
oklch(37.1% 0.027 227)
- #4C3C34
#4C3C34
oklch(37.1% 0.026 48)
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 #31434B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.018
- Charcoal Grey #3C4142 ΔE 0.020
- Dark Grey Blue #29465B ΔE 0.027
- Onyx #343A40 ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.038
- Dark Teal #014D4E ΔE 0.045
- Midnight Green #073B4C ΔE 0.052
Use #31434B 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.