#37555F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43% 0.039 220.9), rgb(55, 85, 95).
Aa
White text reads best on this color (7.99:1).
About this color
#37555F is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.039 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.032 away. White text reads best on it, at 7.99:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #37555F |
| RGB | rgb(55, 85, 95) |
| HSL | hsl(195, 27%, 29%) |
| OKLCH | oklch(43% 0.039 220.9) |
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 #37555F | 7.99:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #37555F | 2.62:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #37555F text on white | 7.99:1 | AAA | Lc 87.7 | Fine for body text |
| #37555F text on black | 2.62:1 | Fails | Lc -14.5 | 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
#B1C4CB
oklch(80.8% 0.023 221.9)
-
Step 400
400
#88A6B1
oklch(70.6% 0.037 222.1)
-
Step 500
500
#6A909E
oklch(63% 0.047 222.7)
-
Step 600
600
#517B88
oklch(55.7% 0.051 219.3)
-
Step 700
700
#416774
oklch(49.1% 0.048 221.6)
-
Step 800
800 (this color)
#37555F
oklch(43% 0.039 220.9)
-
Step 900
900
#2F464D
oklch(37.8% 0.031 218.7)
-
Step 950
950
#1C292D
oklch(27.1% 0.019 218.7)
#37555F 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) | #4F5360 | 0.033 |
| Deuteranopia (no green cones) | #494F5F | 0.029 |
| Tritanopia (no blue cones) | #275858 | 0.025 |
| Achromatopsia (no color) | #515151 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37555F
#37555F
oklch(43% 0.039 220.9)
- #63493F
#63493F
oklch(43% 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 #37555F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.032
- Deep Teal #00555A ΔE 0.041
- Petrol #005F6A ΔE 0.042
- YInMn Blue #415A77 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.053
- Dark Green Blue #1F6357 ΔE 0.054
- Charcoal #264653 ΔE 0.055
- Dusty Grape #545775 ΔE 0.057
Use #37555F 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.