#304F4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.2% 0.037 185.5), rgb(48, 79, 75).
Aa
White text reads best on this color (8.95:1).
About this color
#304F4B is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.037 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.007 away. White text reads best on it, at 8.95:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.34:1 |
| White text | 8.95:1 |
Values
| HEX | #304F4B |
| RGB | rgb(48, 79, 75) |
| HSL | hsl(172, 24%, 25%) |
| OKLCH | oklch(40.2% 0.037 185.5) |
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 #304F4B | 8.95:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #304F4B | 2.34:1 | Fails | Lc 13.5 | Not readable |
| #304F4B text on white | 8.95:1 | AAA | Lc 90.5 | Preferred for body text |
| #304F4B text on black | 2.34:1 | Fails | Lc -11.8 | 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 800.
-
Step 50
50
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D1DCDA
oklch(88.6% 0.012 184)
-
Step 300
300
#B2C5C2
oklch(80.8% 0.021 185.4)
-
Step 400
400
#89A8A3
oklch(70.7% 0.035 184.5)
-
Step 500
500
#6B938D
oklch(63.2% 0.045 184.7)
-
Step 600
600
#527D77
oklch(55.6% 0.049 184.9)
-
Step 700
700
#426964
oklch(49% 0.045 185.6)
-
Step 800
800 (this color)
#304F4B
oklch(40.2% 0.037 185.5)
-
Step 900
900
#304744
oklch(37.8% 0.029 185.9)
-
Step 950
950
#1C2928
oklch(26.9% 0.018 190.2)
#304F4B 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) | #4C4C4B | 0.040 |
| Deuteranopia (no green cones) | #46484B | 0.036 |
| Tritanopia (no blue cones) | #25504E | 0.012 |
| Achromatopsia (no color) | #494949 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F4B
#304F4B
oklch(40.2% 0.037 185.5)
- #5A4045
#5A4045
oklch(40.2% 0.037 6.1)
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 #304F4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.007
- Dark Blue Green #005249 ΔE 0.034
- Dark Teal #014D4E ΔE 0.035
- Deep Teal #00555A ΔE 0.036
- Charcoal #264653 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.047
- Petrol #005F6A ΔE 0.061
Use #304F4B 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.