#304043
Closest named color: Charcoal Grey (#3C4142). oklch(35.9% 0.021 210.3), rgb(48, 64, 67).
Aa
White text reads best on this color (10.82:1).
About this color
#304043 is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.021. 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 10.82:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #304043 |
| RGB | rgb(48, 64, 67) |
| HSL | hsl(189, 17%, 23%) |
| OKLCH | oklch(35.9% 0.021 210.3) |
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 #304043 | 10.82:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #304043 | 1.94:1 | Fails | Lc 8.8 | Not readable |
| #304043 text on white | 10.82:1 | AAA | Lc 95.1 | Preferred for body text |
| #304043 text on black | 1.94:1 | Fails | Lc -7.6 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D3DBDC
oklch(88.6% 0.009 205.9)
-
Step 300
300
#B6C4C6
oklch(81% 0.016 207.1)
-
Step 400
400
#8FA5A9
oklch(70.6% 0.025 209.8)
-
Step 500
500
#738F94
oklch(63% 0.033 209.6)
-
Step 600
600
#5B797F
oklch(55.5% 0.036 211.2)
-
Step 700
700
#4B666B
oklch(49.1% 0.033 210.2)
-
Step 800
800
#3E5357
oklch(42.6% 0.027 210.5)
-
Step 900
900 (this color)
#304043
oklch(35.9% 0.021 210.3)
-
Step 950
950
#1F282A
oklch(26.9% 0.013 212.7)
#304043 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) | #3D3F43 | 0.020 |
| Deuteranopia (no green cones) | #3A3C43 | 0.019 |
| Tritanopia (no blue cones) | #2A4241 | 0.012 |
| Achromatopsia (no color) | #3D3D3D | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304043
#304043
oklch(35.9% 0.021 210.3)
- #473936
#473936
oklch(35.9% 0.021 32.2)
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 #304043, 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 0.019
- Charcoal #264653 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.040
- Dark Slate Gray #2F4F4F ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
- Gunmetal #293241 ΔE 0.049
Use #304043 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.