#37544B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42% 0.038 173), rgb(55, 84, 75).
Aa
White text reads best on this color (8.29:1).
About this color
#37544B is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.038 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.29:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #37544B |
| RGB | rgb(55, 84, 75) |
| HSL | hsl(161, 21%, 27%) |
| OKLCH | oklch(42% 0.038 173) |
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 #37544B | 8.29:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #37544B | 2.53:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #37544B text on white | 8.29:1 | AAA | Lc 88.6 | Fine for body text |
| #37544B 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
#E6EBE9
oklch(93.6% 0.006 170.4)
-
Step 200
200
#D1DCD8
oklch(88.5% 0.013 172.3)
-
Step 300
300
#B3C6BF
oklch(81% 0.023 171.6)
-
Step 400
400
#8BA89E
oklch(70.7% 0.035 172.3)
-
Step 500
500
#6D9387
oklch(63.1% 0.046 173.3)
-
Step 600
600
#557D70
oklch(55.6% 0.049 172.2)
-
Step 700
700
#45695E
oklch(49% 0.045 173.2)
-
Step 800
800 (this color)
#37544B
oklch(42% 0.038 173)
-
Step 900
900
#314740
oklch(37.7% 0.03 172.9)
-
Step 950
950
#1D2A25
oklch(27.1% 0.02 169.2)
#37544B 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) | #52504B | 0.040 |
| Deuteranopia (no green cones) | #4D4D4C | 0.037 |
| Tritanopia (no blue cones) | #2F5551 | 0.012 |
| Achromatopsia (no color) | #4E4E4E | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37544B
#37544B
oklch(42% 0.038 173)
- #5E454F
#5E454F
oklch(42.1% 0.037 353)
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 #37544B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Deep Teal #00555A ΔE 0.042
- Dark Blue Green #005249 ΔE 0.043
- Dark Green Blue #1F6357 ΔE 0.047
- Dark Teal #014D4E ΔE 0.051
- Pine #2B5D34 ΔE 0.056
- Petrol #005F6A ΔE 0.056
- Charcoal #264653 ΔE 0.058
Use #37544B 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.