#37535E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.5% 0.038 224.5), rgb(55, 83, 94).
Aa
White text reads best on this color (8.19:1).
About this color
#37535E is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.038 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.029 away. White text reads best on it, at 8.19:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.56:1 |
| White text | 8.19:1 |
Values
| HEX | #37535E |
| RGB | rgb(55, 83, 94) |
| HSL | hsl(197, 26%, 29%) |
| OKLCH | oklch(42.5% 0.038 224.5) |
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 #37535E | 8.19:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #37535E | 2.56:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #37535E text on white | 8.19:1 | AAA | Lc 88.3 | Fine for body text |
| #37535E text on black | 2.56:1 | Fails | Lc -13.9 | 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
#B2C4CB
oklch(80.9% 0.022 223.1)
-
Step 400
400
#89A6B1
oklch(70.7% 0.036 222.8)
-
Step 500
500
#6C909E
oklch(63.1% 0.045 223.8)
-
Step 600
600
#537A89
oklch(55.6% 0.049 224)
-
Step 700
700
#436774
oklch(49.2% 0.046 222.7)
-
Step 800
800 (this color)
#37535E
oklch(42.5% 0.038 224.5)
-
Step 900
900
#30454D
oklch(37.6% 0.03 223.5)
-
Step 950
950
#1D292D
oklch(27.2% 0.018 220.3)
#37535E 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) | #4D525F | 0.031 |
| Deuteranopia (no green cones) | #474D5E | 0.027 |
| Tritanopia (no blue cones) | #285656 | 0.025 |
| Achromatopsia (no color) | #4F4F4F | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37535E
#37535E
oklch(42.5% 0.038 224.5)
- #61483D
#61483D
oklch(42.5% 0.039 44.8)
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 #37535E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.029
- Deep Teal #00555A ΔE 0.041
- Petrol #005F6A ΔE 0.046
- YInMn Blue #415A77 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Dark Teal #014D4E ΔE 0.056
- Dark Blue Green #005249 ΔE 0.058
Use #37535E 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.