#304E56
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.4% 0.038 216.5), rgb(48, 78, 86).
Aa
White text reads best on this color (8.93:1).
About this color
#304E56 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.038 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.014 away. White text reads best on it, at 8.93:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.34:1 |
| White text | 8.93:1 |
Values
| HEX | #304E56 |
| RGB | rgb(48, 78, 86) |
| HSL | hsl(193, 28%, 26%) |
| OKLCH | oklch(40.4% 0.038 216.5) |
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 #304E56 | 8.93:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #304E56 | 2.34:1 | Fails | Lc 13.5 | Not readable |
| #304E56 text on white | 8.93:1 | AAA | Lc 90.4 | Preferred for body text |
| #304E56 text on black | 2.34:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B1C5CA
oklch(81% 0.023 214.4)
-
Step 400
400
#88A7AF
oklch(70.8% 0.036 215.2)
-
Step 500
500
#6A919B
oklch(63.1% 0.045 215.3)
-
Step 600
600
#517B86
oklch(55.6% 0.049 216)
-
Step 700
700
#416772
oklch(49% 0.046 218.1)
-
Step 800
800 (this color)
#304E56
oklch(40.4% 0.038 216.5)
-
Step 900
900
#2F464C
oklch(37.8% 0.03 215.8)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#304E56 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) | #484C56 | 0.033 |
| Deuteranopia (no green cones) | #424856 | 0.029 |
| Tritanopia (no blue cones) | #205150 | 0.023 |
| Achromatopsia (no color) | #494949 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304E56
#304E56
oklch(40.4% 0.038 216.5)
- #5B423A
#5B423A
oklch(40.4% 0.037 38.5)
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 #304E56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.014
- Charcoal #264653 ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.032
- Deep Teal #00555A ΔE 0.035
- Dark Teal #014D4E ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.045
- Dark Blue Green #005249 ΔE 0.045
- Petrol #005F6A ΔE 0.056
Use #304E56 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.