#304B47
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39% 0.034 184.3), rgb(48, 75, 71).
Aa
White text reads best on this color (9.44:1).
About this color
#304B47 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.034 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.016 away. White text reads best on it, at 9.44:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #304B47 |
| RGB | rgb(48, 75, 71) |
| HSL | hsl(171, 22%, 24%) |
| OKLCH | oklch(39% 0.034 184.3) |
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 #304B47 | 9.44:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #304B47 | 2.22:1 | Fails | Lc 12.2 | Not readable |
| #304B47 text on white | 9.44:1 | AAA | Lc 91.8 | Preferred for body text |
| #304B47 text on black | 2.22:1 | Fails | Lc -10.6 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D0DCDA
oklch(88.5% 0.013 185.1)
-
Step 300
300
#B0C6C2
oklch(80.9% 0.025 183.6)
-
Step 400
400
#85A9A3
oklch(70.6% 0.04 183.9)
-
Step 500
500
#66948D
oklch(63.1% 0.051 184.2)
-
Step 600
600
#4C7E77
oklch(55.6% 0.055 184.5)
-
Step 700
700
#3C6B64
oklch(49.2% 0.053 183.5)
-
Step 800
800
#325752
oklch(42.7% 0.043 184.8)
-
Step 900
900 (this color)
#304B47
oklch(39% 0.034 184.3)
-
Step 950
950
#1B2A28
oklch(27.1% 0.021 185.7)
#304B47 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) | #484847 | 0.035 |
| Deuteranopia (no green cones) | #444447 | 0.035 |
| Tritanopia (no blue cones) | #274C4A | 0.010 |
| Achromatopsia (no color) | #464646 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B47
#304B47
oklch(39% 0.034 184.3)
- #553E43
#553E43
oklch(39.1% 0.033 4.3)
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 #304B47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.016
- Charcoal #264653 ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.033
- Dark Teal #014D4E ΔE 0.034
- Dark Blue Green #005249 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Deep Teal #00555A ΔE 0.043
- Onyx #343A40 ΔE 0.054
Use #304B47 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.