#303E39
Closest named color: Onyx (#343A40). oklch(35% 0.02 171.3), rgb(48, 62, 57).
Aa
White text reads best on this color (11.20:1).
About this color
#303E39 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.022 away. White text reads best on it, at 11.20:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #303E39 |
| RGB | rgb(48, 62, 57) |
| HSL | hsl(159, 13%, 22%) |
| OKLCH | oklch(35% 0.02 171.3) |
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 #303E39 | 11.20:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #303E39 | 1.87:1 | Fails | Lc 8.0 | Not readable |
| #303E39 text on white | 11.20:1 | AAA | Lc 95.9 | Preferred for body text |
| #303E39 text on black | 1.87:1 | 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
#E7EBE9
oklch(93.6% 0.005 165)
-
Step 200
200
#D4DBD8
oklch(88.5% 0.009 168.7)
-
Step 300
300
#B7C4BF
oklch(80.9% 0.016 170.9)
-
Step 400
400
#92A69F
oklch(70.8% 0.025 172.5)
-
Step 500
500
#779087
oklch(63.1% 0.031 171.4)
-
Step 600
600
#607A71
oklch(55.6% 0.033 171.9)
-
Step 700
700
#4F675E
oklch(49.2% 0.032 170)
-
Step 800
800
#41544D
oklch(42.8% 0.026 170.6)
-
Step 900
900 (this color)
#303E39
oklch(35% 0.02 171.3)
-
Step 950
950
#202926
oklch(27.1% 0.014 173)
#303E39 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) | #3D3C39 | 0.021 |
| Deuteranopia (no green cones) | #3A3A39 | 0.020 |
| Tritanopia (no blue cones) | #2D3E3C | 0.006 |
| Achromatopsia (no color) | #3B3B3B | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E39
#303E39
oklch(35% 0.02 171.3)
- #43363C
#43363C
oklch(34.9% 0.021 348.7)
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 #303E39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Charcoal Grey #3C4142 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.044
- Charcoal #264653 ΔE 0.044
- Gunmetal #293241 ΔE 0.050
- Midnight Green #073B4C ΔE 0.054
- Pakistan Green #283618 ΔE 0.055
- Dark Teal #014D4E ΔE 0.057
Use #303E39 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.