#37574C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.8% 0.042 170.6), rgb(55, 87, 76).
Aa
White text reads best on this color (7.98:1).
About this color
#37574C is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.042 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.031 away. White text reads best on it, at 7.98:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.63:1 |
| White text | 7.98:1 |
Values
| HEX | #37574C |
| RGB | rgb(55, 87, 76) |
| HSL | hsl(159, 23%, 28%) |
| OKLCH | oklch(42.8% 0.042 170.6) |
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 #37574C | 7.98:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #37574C | 2.63:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #37574C text on white | 7.98:1 | AAA | Lc 87.6 | Fine for body text |
| #37574C text on black | 2.63:1 | 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
#D1DCD8
oklch(88.5% 0.013 172.3)
-
Step 300
300
#B2C6BE
oklch(80.9% 0.024 169.7)
-
Step 400
400
#89A99D
oklch(70.7% 0.039 170.4)
-
Step 500
500
#6B9485
oklch(63.2% 0.051 170)
-
Step 600
600
#527E6F
oklch(55.6% 0.054 170.8)
-
Step 700
700
#426A5D
oklch(49% 0.05 171.6)
-
Step 800
800 (this color)
#37574C
oklch(42.8% 0.042 170.6)
-
Step 900
900
#30473F
oklch(37.6% 0.032 170.9)
-
Step 950
950
#1C2A25
oklch(27% 0.021 170.6)
#37574C 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) | #55534B | 0.043 |
| Deuteranopia (no green cones) | #504F4D | 0.042 |
| Tritanopia (no blue cones) | #2E5754 | 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°).
- #37574C
#37574C
oklch(42.8% 0.042 170.6)
- #624652
#624652
oklch(42.9% 0.042 351.6)
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 #37574C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.031
- Dark Green Blue #1F6357 ΔE 0.039
- Deep Teal #00555A ΔE 0.044
- Dark Blue Green #005249 ΔE 0.046
- Pine #2B5D34 ΔE 0.050
- Petrol #005F6A ΔE 0.053
- Dark Teal #014D4E ΔE 0.057
- Spruce #0A5F38 ΔE 0.059
Use #37574C 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.