#37544D
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.1% 0.037 177.6), rgb(55, 84, 77).
Aa
White text reads best on this color (8.27:1).
About this color
#37544D is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.037 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.021 away. White text reads best on it, at 8.27:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.53:1 |
| White text | 8.27:1 |
Values
| HEX | #37544D |
| RGB | rgb(55, 84, 77) |
| HSL | hsl(166, 21%, 27%) |
| OKLCH | oklch(42.1% 0.037 177.6) |
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 #37544D | 8.27:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #37544D | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #37544D text on white | 8.27:1 | AAA | Lc 88.5 | Fine for body text |
| #37544D text on black | 2.53:1 | Fails | Lc -13.6 | 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 800.
-
Step 50
50
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D1DCD9
oklch(88.5% 0.013 178)
-
Step 300
300
#B3C5C0
oklch(80.8% 0.021 177.3)
-
Step 400
400
#8BA8A0
oklch(70.7% 0.034 176.7)
-
Step 500
500
#6D9389
oklch(63.2% 0.045 176.8)
-
Step 600
600
#547D73
oklch(55.6% 0.048 177.5)
-
Step 700
700
#456960
oklch(49.1% 0.044 177)
-
Step 800
800 (this color)
#37544D
oklch(42.1% 0.037 177.6)
-
Step 900
900
#314741
oklch(37.8% 0.029 175.9)
-
Step 950
950
#1D2926
oklch(26.9% 0.017 177.9)
#37544D 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) | #52514D | 0.039 |
| Deuteranopia (no green cones) | #4D4D4E | 0.037 |
| Tritanopia (no blue cones) | #2F5552 | 0.011 |
| Achromatopsia (no color) | #4E4E4E | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37544D
#37544D
oklch(42.1% 0.037 177.6)
- #5E454D
#5E454D
oklch(42% 0.036 357.8)
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 #37544D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.021
- Deep Teal #00555A ΔE 0.041
- Dark Blue Green #005249 ΔE 0.043
- Dark Green Blue #1F6357 ΔE 0.047
- Dark Teal #014D4E ΔE 0.051
- Petrol #005F6A ΔE 0.054
- Charcoal #264653 ΔE 0.056
- Pine #2B5D34 ΔE 0.058
Use #37544D 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.