#304540
Closest named color: Charcoal Grey (#3C4142). oklch(37.1% 0.028 178.3), rgb(48, 69, 64).
Aa
White text reads best on this color (10.23:1).
About this color
#304540 is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.022 away. White text reads best on it, at 10.23:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.05:1 |
| White text | 10.23:1 |
Values
| HEX | #304540 |
| RGB | rgb(48, 69, 64) |
| HSL | hsl(166, 18%, 23%) |
| OKLCH | oklch(37.1% 0.028 178.3) |
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 #304540 | 10.23:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #304540 | 2.05:1 | Fails | Lc 10.2 | Not readable |
| #304540 text on white | 10.23:1 | AAA | Lc 93.8 | Preferred for body text |
| #304540 text on black | 2.05:1 | Fails | Lc -8.8 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D2DCD9
oklch(88.6% 0.012 176.3)
-
Step 300
300
#B3C5C0
oklch(80.8% 0.021 177.3)
-
Step 400
400
#8BA8A1
oklch(70.8% 0.034 179)
-
Step 500
500
#6E9289
oklch(63% 0.042 177.8)
-
Step 600
600
#557D73
oklch(55.7% 0.047 177.1)
-
Step 700
700
#456961
oklch(49.1% 0.043 178.9)
-
Step 800
800
#39564F
oklch(42.8% 0.037 177.7)
-
Step 900
900 (this color)
#304540
oklch(37.1% 0.028 178.3)
-
Step 950
950
#1D2926
oklch(26.9% 0.017 177.9)
#304540 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) | #434240 | 0.029 |
| Deuteranopia (no green cones) | #3F4040 | 0.026 |
| Tritanopia (no blue cones) | #2A4643 | 0.008 |
| Achromatopsia (no color) | #414141 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304540
#304540
oklch(37.1% 0.028 178.3)
- #4D3A40
#4D3A40
oklch(37.1% 0.028 357.8)
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 #304540, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.035
- Onyx #343A40 ΔE 0.037
- Dark Teal #014D4E ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.046
- Dark Blue Green #005249 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.052
Use #304540 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.