#37545B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.6% 0.036 214.5), rgb(55, 84, 91).
Aa
White text reads best on this color (8.13:1).
About this color
#37545B is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.036 and its hue 214°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.026 away. White text reads best on it, at 8.13:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #37545B |
| RGB | rgb(55, 84, 91) |
| HSL | hsl(192, 25%, 29%) |
| OKLCH | oklch(42.6% 0.036 214.5) |
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 #37545B | 8.13:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #37545B | 2.58:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #37545B text on white | 8.13:1 | AAA | Lc 88.1 | Fine for body text |
| #37545B text on black | 2.58:1 | Fails | Lc -14.1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D1DBDE
oklch(88.5% 0.012 217.6)
-
Step 300
300
#B2C4C9
oklch(80.8% 0.021 216.2)
-
Step 400
400
#89A6AE
oklch(70.6% 0.034 216.3)
-
Step 500
500
#6B919A
oklch(63.2% 0.044 213.9)
-
Step 600
600
#537B84
oklch(55.7% 0.047 213.3)
-
Step 700
700
#436770
oklch(49% 0.044 215.2)
-
Step 800
800 (this color)
#37545B
oklch(42.6% 0.036 214.5)
-
Step 900
900
#30464B
oklch(37.8% 0.029 213.3)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#37545B 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) | #4F525B | 0.033 |
| Deuteranopia (no green cones) | #494E5B | 0.030 |
| Tritanopia (no blue cones) | #295756 | 0.021 |
| Achromatopsia (no color) | #4F4F4F | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37545B
#37545B
oklch(42.6% 0.036 214.5)
- #614841
#614841
oklch(42.6% 0.036 36.2)
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 #37545B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.026
- Deep Teal #00555A ΔE 0.039
- Petrol #005F6A ΔE 0.044
- YInMn Blue #415A77 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.051
- Charcoal #264653 ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.054
- Dark Blue Green #005249 ΔE 0.055
Use #37545B 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.