#313A40
Closest named color: Onyx (#343A40). oklch(34.3% 0.016 237.2), rgb(49, 58, 64).
Aa
White text reads best on this color (11.60:1).
About this color
#313A40 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.005 away. White text reads best on it, at 11.60:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.60:1 |
Values
| HEX | #313A40 |
| RGB | rgb(49, 58, 64) |
| HSL | hsl(204, 13%, 22%) |
| OKLCH | oklch(34.3% 0.016 237.2) |
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 #313A40 | 11.60:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #313A40 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #313A40 text on white | 11.60:1 | AAA | Lc 96.7 | Preferred for body text |
| #313A40 text on black | 1.80:1 | 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
#F4F5F6
oklch(97% 0.002 247.8)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#BAC2C7
oklch(80.9% 0.011 234.9)
-
Step 400
400
#96A3AB
oklch(70.8% 0.019 234.6)
-
Step 500
500
#7C8C97
oklch(63.1% 0.025 237.9)
-
Step 600
600
#657681
oklch(55.6% 0.026 236.4)
-
Step 700
700
#54636D
oklch(49.1% 0.024 237.2)
-
Step 800
800
#455159
oklch(42.7% 0.02 237.2)
-
Step 900
900 (this color)
#313A40
oklch(34.3% 0.016 237.2)
-
Step 950
950
#22272B
oklch(26.9% 0.01 242.1)
#313A40 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) | #373A40 | 0.010 |
| Deuteranopia (no green cones) | #353840 | 0.009 |
| Tritanopia (no blue cones) | #2D3C3C | 0.013 |
| Achromatopsia (no color) | #393939 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A40
#313A40
oklch(34.3% 0.016 237.2)
- #3F3731
#3F3731
oklch(34.3% 0.015 59.1)
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 #313A40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.005
- Charcoal Grey #3C4142 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.031
- Gunmetal #293241 ΔE 0.032
- Charcoal #264653 ΔE 0.043
- Midnight Green #073B4C ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.051
Use #313A40 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.