#304D55
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.1% 0.037 217.1), rgb(48, 77, 85).
Aa
White text reads best on this color (9.05:1).
About this color
#304D55 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.037 and its hue 217°. 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 9.05:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.31:1 |
| White text | 9.05:1 |
Values
| HEX | #304D55 |
| RGB | rgb(48, 77, 85) |
| HSL | hsl(193, 28%, 26%) |
| OKLCH | oklch(40.1% 0.037 217.1) |
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 #304D55 | 9.05:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #304D55 | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #304D55 text on white | 9.05:1 | AAA | Lc 90.8 | Preferred for body text |
| #304D55 text on black | 2.31:1 | Fails | Lc -11.6 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCE0
oklch(88.5% 0.016 216.7)
-
Step 300
300
#ADC5CC
oklch(80.8% 0.028 217.2)
-
Step 400
400
#82A8B3
oklch(70.7% 0.044 217.4)
-
Step 500
500
#6192A0
oklch(63% 0.057 217.7)
-
Step 600
600
#467C8B
oklch(55.5% 0.062 217.7)
-
Step 700
700
#376976
oklch(49.1% 0.058 216.7)
-
Step 800
800
#2E5660
oklch(42.8% 0.048 215.8)
-
Step 900
900 (this color)
#304D55
oklch(40.1% 0.037 217.1)
-
Step 950
950
#19292E
oklch(26.9% 0.023 219.4)
#304D55 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) | #484B55 | 0.033 |
| Deuteranopia (no green cones) | #424755 | 0.030 |
| Tritanopia (no blue cones) | #21504F | 0.023 |
| Achromatopsia (no color) | #494949 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D55
#304D55
oklch(40.1% 0.037 217.1)
- #5A413A
#5A413A
oklch(40.1% 0.037 36.2)
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 #304D55, 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 0.027
- Dark Grey Blue #29465B ΔE 0.030
- Deep Teal #00555A ΔE 0.036
- Dark Teal #014D4E ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Blue Green #005249 ΔE 0.046
- Petrol #005F6A ΔE 0.059
Use #304D55 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.