#304F57
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.7% 0.039 215.9), rgb(48, 79, 87).
Aa
White text reads best on this color (8.81:1).
About this color
#304F57 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.039 and its hue 216°. 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 8.81:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #304F57 |
| RGB | rgb(48, 79, 87) |
| HSL | hsl(192, 29%, 26%) |
| OKLCH | oklch(40.7% 0.039 215.9) |
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 #304F57 | 8.81:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #304F57 | 2.38:1 | Fails | Lc 13.9 | Not readable |
| #304F57 text on white | 8.81:1 | AAA | Lc 90.1 | Preferred for body text |
| #304F57 text on black | 2.38:1 | Fails | Lc -12.2 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBDE
oklch(88.4% 0.013 215.8)
-
Step 300
300
#B1C5CA
oklch(81% 0.023 214.4)
-
Step 400
400
#88A7AF
oklch(70.8% 0.036 215.2)
-
Step 500
500
#69919C
oklch(63.1% 0.047 216.6)
-
Step 600
600
#507B86
oklch(55.6% 0.05 215.6)
-
Step 700
700
#406872
oklch(49.2% 0.048 215.4)
-
Step 800
800 (this color)
#304F57
oklch(40.7% 0.039 215.9)
-
Step 900
900
#2F464C
oklch(37.8% 0.03 215.8)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#304F57 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) | #494D57 | 0.034 |
| Deuteranopia (no green cones) | #434857 | 0.032 |
| Tritanopia (no blue cones) | #1F5251 | 0.024 |
| Achromatopsia (no color) | #4A4A4A | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F57
#304F57
oklch(40.7% 0.039 215.9)
- #5D423B
#5D423B
oklch(40.7% 0.04 35)
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 #304F57, 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 0.033
- Deep Teal #00555A ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.034
- Dark Teal #014D4E ΔE 0.040
- Dark Blue Green #005249 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.048
- Petrol #005F6A ΔE 0.053
Use #304F57 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.