#304E47
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.8% 0.038 177.9), rgb(48, 78, 71).
Aa
White text reads best on this color (9.10:1).
About this color
#304E47 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.038 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.013 away. White text reads best on it, at 9.10:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #304E47 |
| RGB | rgb(48, 78, 71) |
| HSL | hsl(166, 24%, 25%) |
| OKLCH | oklch(39.8% 0.038 177.9) |
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 #304E47 | 9.10:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #304E47 | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #304E47 text on white | 9.10:1 | AAA | Lc 90.9 | Preferred for body text |
| #304E47 text on black | 2.30:1 | Fails | Lc -11.4 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CFDDD9
oklch(88.6% 0.016 177)
-
Step 300
300
#AEC7C0
oklch(80.9% 0.029 176.9)
-
Step 400
400
#83AAA0
oklch(70.6% 0.045 177.5)
-
Step 500
500
#629589
oklch(63% 0.058 177.9)
-
Step 600
600
#478073
oklch(55.7% 0.064 177.4)
-
Step 700
700
#386C61
oklch(49.2% 0.059 178.3)
-
Step 800
800
#2F584F
oklch(42.7% 0.049 178)
-
Step 900
900 (this color)
#304E47
oklch(39.8% 0.038 177.9)
-
Step 950
950
#192A26
oklch(26.9% 0.024 178)
#304E47 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) | #4C4B47 | 0.040 |
| Deuteranopia (no green cones) | #464748 | 0.037 |
| Tritanopia (no blue cones) | #274F4C | 0.011 |
| Achromatopsia (no color) | #484848 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304E47
#304E47
oklch(39.8% 0.038 177.9)
- #583F47
#583F47
oklch(39.8% 0.037 358)
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 #304E47, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.013
- Dark Blue Green #005249 ΔE 0.033
- Dark Teal #014D4E ΔE 0.035
- Deep Teal #00555A ΔE 0.040
- Charcoal #264653 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.050
- Onyx #343A40 ΔE 0.064
Use #304E47 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.