#303D40
Closest named color: Onyx (#343A40). oklch(35% 0.018 213.3), rgb(48, 61, 64).
Aa
White text reads best on this color (11.24:1).
About this color
#303D40 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.011 away. White text reads best on it, at 11.24:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.86:1 |
| White text | 11.24:1 |
Values
| HEX | #303D40 |
| RGB | rgb(48, 61, 64) |
| HSL | hsl(191, 14%, 22%) |
| OKLCH | oklch(35% 0.018 213.3) |
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 #303D40 | 11.24:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #303D40 | 1.86:1 | Fails | Lc 7.9 | Not readable |
| #303D40 text on white | 11.24:1 | AAA | Lc 96.0 | Preferred for body text |
| #303D40 text on black | 1.86:1 | 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
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D4DADC
oklch(88.4% 0.007 219.6)
-
Step 300
300
#B7C3C6
oklch(80.9% 0.014 214.4)
-
Step 400
400
#92A4A9
oklch(70.6% 0.022 216.3)
-
Step 500
500
#778E93
oklch(63% 0.027 212.3)
-
Step 600
600
#60787E
oklch(55.6% 0.029 214.6)
-
Step 700
700
#4F656A
oklch(49.1% 0.028 213.1)
-
Step 800
800
#415257
oklch(42.6% 0.023 217.6)
-
Step 900
900 (this color)
#303D40
oklch(35% 0.018 213.3)
-
Step 950
950
#20282A
oklch(27% 0.012 214.5)
#303D40 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) | #3B3C40 | 0.017 |
| Deuteranopia (no green cones) | #383A40 | 0.015 |
| Tritanopia (no blue cones) | #2B3E3E | 0.009 |
| Achromatopsia (no color) | #3B3B3B | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D40
#303D40
oklch(35% 0.018 213.3)
- #433734
#433734
oklch(34.9% 0.018 34.3)
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 #303D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.011
- Charcoal Grey #3C4142 ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.033
- Charcoal #264653 ΔE 0.037
- Gunmetal #293241 ΔE 0.041
- Midnight Green #073B4C ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.057
Use #303D40 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.