#303B33
Closest named color: Onyx (#343A40). oklch(33.9% 0.02 153.7), rgb(48, 59, 51).
Aa
White text reads best on this color (11.67:1).
About this color
#303B33 is a dark close to neutral grey. In OKLCH its lightness is 34%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.026 away. White text reads best on it, at 11.67:1.
| Hue family | Neutrals |
| Lightness | dark (34%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #303B33 |
| RGB | rgb(48, 59, 51) |
| HSL | hsl(136, 10%, 21%) |
| OKLCH | oklch(33.9% 0.02 153.7) |
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 #303B33 | 11.67:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #303B33 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #303B33 text on white | 11.67:1 | AAA | Lc 96.8 | Preferred for body text |
| #303B33 text on black | 1.79:1 | 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
#BAC4BC
oklch(81% 0.016 151.7)
-
Step 400
400
#96A59A
oklch(70.7% 0.023 153.9)
-
Step 500
500
#7C8F81
oklch(63.1% 0.03 153.5)
-
Step 600
600
#65796A
oklch(55.5% 0.033 152.8)
-
Step 700
700
#536659
oklch(49% 0.031 155.2)
-
Step 800
800
#445348
oklch(42.6% 0.026 153.4)
-
Step 900
900 (this color)
#303B33
oklch(33.9% 0.02 153.7)
-
Step 950
950
#222824
oklch(26.9% 0.011 156.4)
#303B33 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 | 0.019 |
| Deuteranopia (no green cones) | #393833 | 0.017 |
| Tritanopia (no blue cones) | #2E3B39 | 0.010 |
| Achromatopsia (no color) | #383838 | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303B33
#303B33
oklch(33.9% 0.02 153.7)
- #3F343C
#3F343C
oklch(34% 0.021 335.8)
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 #303B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.026
- Charcoal Grey #3C4142 ΔE 0.036
- Pakistan Green #283618 ΔE 0.045
- Gunmetal #293241 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.049
- Charcoal #264653 ΔE 0.055
- Midnight Green #073B4C ΔE 0.057
- Evergreen #05472A ΔE 0.061
Use #303B33 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.