#37574B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.8% 0.043 168.7), rgb(55, 87, 75).
Aa
White text reads best on this color (7.99:1).
About this color
#37574B is a dark, muted green. In OKLCH its lightness is 43%, its chroma 0.043 and its hue 169°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.032 away. White text reads best on it, at 7.99:1.
| Hue family | Greens |
| Lightness | dark (43%) |
| Chroma | muted (0.043) |
| Temperature | in between |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #37574B |
| RGB | rgb(55, 87, 75) |
| HSL | hsl(158, 23%, 28%) |
| OKLCH | oklch(42.8% 0.043 168.7) |
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 #37574B | 7.99:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #37574B | 2.62:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #37574B text on white | 7.99:1 | AAA | Lc 87.7 | Fine for body text |
| #37574B text on black | 2.62:1 | Fails | Lc -14.5 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5EBE9
oklch(93.5% 0.007 174.4)
-
Step 200
200
#D1DCD7
oklch(88.5% 0.014 167.1)
-
Step 300
300
#B2C6BE
oklch(80.9% 0.024 169.7)
-
Step 400
400
#89A99C
oklch(70.7% 0.04 168.5)
-
Step 500
500
#6B9484
oklch(63.2% 0.051 168.6)
-
Step 600
600
#527E6D
oklch(55.6% 0.056 168.1)
-
Step 700
700
#426A5B
oklch(49% 0.052 168.5)
-
Step 800
800 (this color)
#37574B
oklch(42.8% 0.043 168.7)
-
Step 900
900
#30473E
oklch(37.6% 0.033 168.3)
-
Step 950
950
#1C2A25
oklch(27% 0.021 170.6)
#37574B 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) | #55534A | 0.043 |
| Deuteranopia (no green cones) | #504F4C | 0.042 |
| Tritanopia (no blue cones) | #2F5753 | 0.015 |
| Achromatopsia (no color) | #515151 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37574B
#37574B
oklch(42.8% 0.043 168.7)
- #614653
#614653
oklch(42.8% 0.042 348.6)
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 #37574B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.032
- Dark Green Blue #1F6357 ΔE 0.039
- Deep Teal #00555A ΔE 0.045
- Dark Blue Green #005249 ΔE 0.046
- Pine #2B5D34 ΔE 0.049
- Petrol #005F6A ΔE 0.054
- Dark Teal #014D4E ΔE 0.057
- Spruce #0A5F38 ΔE 0.058
Use #37574B 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.