#313C43
Closest named color: Onyx (#343A40). oklch(34.9% 0.019 236), rgb(49, 60, 67).
Aa
White text reads best on this color (11.30:1).
About this color
#313C43 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.008 away. White text reads best on it, at 11.30:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.85:1 |
| White text | 11.30:1 |
Values
| HEX | #313C43 |
| RGB | rgb(49, 60, 67) |
| HSL | hsl(203, 16%, 23%) |
| OKLCH | oklch(34.9% 0.019 236) |
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 #313C43 | 11.30:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #313C43 | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #313C43 text on white | 11.30:1 | AAA | Lc 96.1 | Preferred for body text |
| #313C43 text on black | 1.85:1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B8C2C9
oklch(80.8% 0.015 238.1)
-
Step 400
400
#94A3AD
oklch(70.7% 0.022 236.9)
-
Step 500
500
#798D99
oklch(63.2% 0.029 234.3)
-
Step 600
600
#627784
oklch(55.7% 0.032 235.3)
-
Step 700
700
#51646F
oklch(49.2% 0.029 233.6)
-
Step 800
800
#42515B
oklch(42.6% 0.025 237.4)
-
Step 900
900 (this color)
#313C43
oklch(34.9% 0.019 236)
-
Step 950
950
#21272C
oklch(26.9% 0.013 243.3)
#313C43 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) | #393C43 | 0.013 |
| Deuteranopia (no green cones) | #363A43 | 0.010 |
| Tritanopia (no blue cones) | #2C3E3E | 0.015 |
| Achromatopsia (no color) | #3A3A3A | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C43
#313C43
oklch(34.9% 0.019 236)
- #423831
#423831
oklch(34.9% 0.019 57.1)
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 #313C43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.008
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.029
- Charcoal #264653 ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.045
- Midnight Green #073B4C ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.052
Use #313C43 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.