#304D58
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.2% 0.039 223.9), rgb(48, 77, 88).
Aa
White text reads best on this color (9.02:1).
About this color
#304D58 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.039 and its hue 224°. 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 9.02:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #304D58 |
| RGB | rgb(48, 77, 88) |
| HSL | hsl(197, 29%, 27%) |
| OKLCH | oklch(40.2% 0.039 223.9) |
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 #304D58 | 9.02:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #304D58 | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #304D58 text on white | 9.02:1 | AAA | Lc 90.7 | Preferred for body text |
| #304D58 text on black | 2.32:1 | 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
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ADC5CF
oklch(80.9% 0.03 224.8)
-
Step 400
400
#81A7B7
oklch(70.6% 0.047 225.6)
-
Step 500
500
#6092A5
oklch(63.2% 0.061 223.9)
-
Step 600
600
#457C90
oklch(55.6% 0.066 223.7)
-
Step 700
700
#37687A
oklch(49% 0.06 224.1)
-
Step 800
800
#2E5563
oklch(42.7% 0.05 223.4)
-
Step 900
900 (this color)
#304D58
oklch(40.2% 0.039 223.9)
-
Step 950
950
#19292F
oklch(26.9% 0.024 223.4)
#304D58 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) | #474C59 | 0.032 |
| Deuteranopia (no green cones) | #414758 | 0.028 |
| Tritanopia (no blue cones) | #1F5050 | 0.026 |
| Achromatopsia (no color) | #494949 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304D58
#304D58
oklch(40.2% 0.039 223.9)
- #5B4237
#5B4237
oklch(40.3% 0.039 44.8)
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 #304D58, 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
- Charcoal #264653 ΔE 0.027
- Dark Grey Blue #29465B ΔE 0.027
- Deep Teal #00555A ΔE 0.037
- Dark Teal #014D4E ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.045
- Dark Blue Green #005249 ΔE 0.049
- Petrol #005F6A ΔE 0.058
Use #304D58 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.