#313B33
Closest named color: Onyx (#343A40). oklch(34% 0.019 151.1), rgb(49, 59, 51).
Aa
White text reads best on this color (11.64:1).
About this color
#313B33 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 0.025 away. White text reads best on it, at 11.64:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #313B33 |
| RGB | rgb(49, 59, 51) |
| HSL | hsl(132, 9%, 21%) |
| OKLCH | oklch(34% 0.019 151.1) |
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 #313B33 | 11.64:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #313B33 | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #313B33 text on white | 11.64:1 | AAA | Lc 96.8 | Preferred for body text |
| #313B33 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D5DBD6
oklch(88.5% 0.009 150.7)
-
Step 300
300
#BAC3BC
oklch(80.8% 0.014 152.5)
-
Step 400
400
#97A599
oklch(70.7% 0.023 149.6)
-
Step 500
500
#7D8F81
oklch(63.1% 0.029 152.1)
-
Step 600
600
#66796A
oklch(55.6% 0.032 151.5)
-
Step 700
700
#556658
oklch(49.2% 0.03 150.3)
-
Step 800
800
#455348
oklch(42.7% 0.025 151.6)
-
Step 900
900 (this color)
#313B33
oklch(34% 0.019 151.1)
-
Step 950
950
#222823
oklch(26.9% 0.013 150.2)
#313B33 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) | #3B3933 | 0.017 |
| Deuteranopia (no green cones) | #393833 | 0.016 |
| Tritanopia (no blue cones) | #303B39 | 0.010 |
| Achromatopsia (no color) | #383838 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B33
#313B33
oklch(34% 0.019 151.1)
- #3E353D
#3E353D
oklch(34.2% 0.018 329.6)
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 #313B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.025
- Charcoal Grey #3C4142 ΔE 0.035
- Pakistan Green #283618 ΔE 0.046
- Gunmetal #293241 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.050
- Charcoal #264653 ΔE 0.055
- Midnight Green #073B4C ΔE 0.058
- Evergreen #05472A ΔE 0.062
Use #313B33 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.