#304D43
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.4% 0.039 170.5), rgb(48, 77, 67).
Aa
White text reads best on this color (9.25:1).
About this color
#304D43 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.039 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.019 away. White text reads best on it, at 9.25:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #304D43 |
| RGB | rgb(48, 77, 67) |
| HSL | hsl(159, 23%, 25%) |
| OKLCH | oklch(39.4% 0.039 170.5) |
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 #304D43 | 9.25:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #304D43 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #304D43 text on white | 9.25:1 | AAA | Lc 91.3 | Preferred for body text |
| #304D43 text on black | 2.26:1 | Fails | Lc -11.0 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5ECE9
oklch(93.7% 0.008 168.7)
-
Step 200
200
#CFDDD7
oklch(88.5% 0.017 168.4)
-
Step 300
300
#AFC7BE
oklch(80.9% 0.029 171)
-
Step 400
400
#84AA9C
oklch(70.6% 0.046 170.4)
-
Step 500
500
#649684
oklch(63.2% 0.06 169.8)
-
Step 600
600
#4A806E
oklch(55.7% 0.065 170.5)
-
Step 700
700
#3A6C5C
oklch(49.1% 0.061 171)
-
Step 800
800
#31584B
oklch(42.7% 0.05 170.5)
-
Step 900
900 (this color)
#304D43
oklch(39.4% 0.039 170.5)
-
Step 950
950
#1A2A25
oklch(26.9% 0.023 173)
#304D43 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) | #4B4943 | 0.040 |
| Deuteranopia (no green cones) | #464644 | 0.038 |
| Tritanopia (no blue cones) | #284D4A | 0.014 |
| Achromatopsia (no color) | #474747 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D43
#304D43
oklch(39.4% 0.039 170.5)
- #573E49
#573E49
oklch(39.5% 0.039 350.9)
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 #304D43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.019
- Dark Blue Green #005249 ΔE 0.033
- Dark Teal #014D4E ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.041
- Charcoal #264653 ΔE 0.043
- Deep Teal #00555A ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.054
- Evergreen #05472A ΔE 0.060
Use #304D43 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.