#37554E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.4% 0.038 178.1), rgb(55, 85, 78).
Aa
White text reads best on this color (8.16:1).
About this color
#37554E is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.038 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.024 away. White text reads best on it, at 8.16:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #37554E |
| RGB | rgb(55, 85, 78) |
| HSL | hsl(166, 21%, 27%) |
| OKLCH | oklch(42.4% 0.038 178.1) |
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 #37554E | 8.16:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #37554E | 2.57:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #37554E text on white | 8.16:1 | AAA | Lc 88.2 | Fine for body text |
| #37554E text on black | 2.57:1 | Fails | Lc -14.0 | 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
#B2C6C0
oklch(81% 0.023 175.8)
-
Step 400
400
#8AA8A0
oklch(70.7% 0.035 177.3)
-
Step 500
500
#6C9389
oklch(63.1% 0.046 177.2)
-
Step 600
600
#537D73
oklch(55.6% 0.049 177.8)
-
Step 700
700
#446961
oklch(49% 0.044 179.3)
-
Step 800
800 (this color)
#37554E
oklch(42.4% 0.038 178.1)
-
Step 900
900
#314742
oklch(37.8% 0.029 179)
-
Step 950
950
#1D2A26
oklch(27.2% 0.019 173.9)
#37554E 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) | #53524E | 0.040 |
| Deuteranopia (no green cones) | #4D4E4F | 0.037 |
| Tritanopia (no blue cones) | #2E5653 | 0.011 |
| Achromatopsia (no color) | #4F4F4F | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37554E
#37554E
oklch(42.4% 0.038 178.1)
- #60464E
#60464E
oklch(42.5% 0.038 358.6)
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 #37554E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.024
- Deep Teal #00555A ΔE 0.041
- Dark Green Blue #1F6357 ΔE 0.044
- Dark Blue Green #005249 ΔE 0.045
- Petrol #005F6A ΔE 0.052
- Dark Teal #014D4E ΔE 0.053
- Pine #2B5D34 ΔE 0.057
- Charcoal #264653 ΔE 0.059
Use #37554E 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.