#375657
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.9% 0.037 198.5), rgb(55, 86, 87).
Aa
White text reads best on this color (7.98:1).
About this color
#375657 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.037 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 7.98:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.63:1 |
| White text | 7.98:1 |
Values
| HEX | #375657 |
| RGB | rgb(55, 86, 87) |
| HSL | hsl(182, 23%, 28%) |
| OKLCH | oklch(42.9% 0.037 198.5) |
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 #375657 | 7.98:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #375657 | 2.63:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #375657 text on white | 7.98:1 | AAA | Lc 87.6 | Fine for body text |
| #375657 text on black | 2.63:1 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D1DCDC
oklch(88.6% 0.012 196.9)
-
Step 300
300
#B2C5C6
oklch(80.9% 0.021 200.6)
-
Step 400
400
#88A8A8
oklch(70.8% 0.035 196.4)
-
Step 500
500
#6A9293
oklch(63.1% 0.044 198)
-
Step 600
600
#517C7E
oklch(55.6% 0.048 199.6)
-
Step 700
700
#42696A
oklch(49.2% 0.044 197.9)
-
Step 800
800 (this color)
#375657
oklch(42.9% 0.037 198.5)
-
Step 900
900
#2F4647
oklch(37.6% 0.029 199.4)
-
Step 950
950
#1C292A
oklch(26.9% 0.018 202.1)
#375657 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) | #525357 | 0.038 |
| Deuteranopia (no green cones) | #4C4F57 | 0.035 |
| Tritanopia (no blue cones) | #2B5856 | 0.014 |
| Achromatopsia (no color) | #515151 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375657
#375657
oklch(42.9% 0.037 198.5)
- #624848
#624848
oklch(43% 0.036 18.6)
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 #375657, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Deep Teal #00555A ΔE 0.039
- Petrol #005F6A ΔE 0.044
- Dark Green Blue #1F6357 ΔE 0.045
- Dark Blue Green #005249 ΔE 0.051
- YInMn Blue #415A77 ΔE 0.055
- Dark Teal #014D4E ΔE 0.056
- Charcoal #264653 ΔE 0.058
Use #375657 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.