#37545F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.8% 0.039 223.7), rgb(55, 84, 95).
Aa
White text reads best on this color (8.08:1).
About this color
#37545F is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.039 and its hue 224°. 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 8.08:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.59:1 |
| White text | 8.08:1 |
Values
| HEX | #37545F |
| RGB | rgb(55, 84, 95) |
| HSL | hsl(197, 27%, 29%) |
| OKLCH | oklch(42.8% 0.039 223.7) |
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 #37545F | 8.08:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #37545F | 2.59:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #37545F text on white | 8.08:1 | AAA | Lc 88.0 | Fine for body text |
| #37545F text on black | 2.59:1 | Fails | Lc -14.2 | 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
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B2C4CC
oklch(80.9% 0.023 226.2)
-
Step 400
400
#89A6B2
oklch(70.7% 0.037 224.9)
-
Step 500
500
#6B909E
oklch(63.1% 0.046 223.2)
-
Step 600
600
#527A89
oklch(55.6% 0.05 223.5)
-
Step 700
700
#426775
oklch(49.2% 0.048 223.9)
-
Step 800
800 (this color)
#37545F
oklch(42.8% 0.039 223.7)
-
Step 900
900
#30454E
oklch(37.7% 0.03 226.3)
-
Step 950
950
#1C292D
oklch(27.1% 0.019 218.7)
#37545F 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) | #4E5360 | 0.032 |
| Deuteranopia (no green cones) | #484E5F | 0.028 |
| Tritanopia (no blue cones) | #275757 | 0.026 |
| Achromatopsia (no color) | #505050 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37545F
#37545F
oklch(42.8% 0.039 223.7)
- #62483E
#62483E
oklch(42.7% 0.039 42)
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 #37545F, 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
- Deep Teal #00555A ΔE 0.041
- Petrol #005F6A ΔE 0.044
- YInMn Blue #415A77 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.057
- Dusty Grape #545775 ΔE 0.057
Use #37545F 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.