#375B66
Closest named color: YInMn Blue (#415A77). oklch(44.9% 0.045 219.3), rgb(55, 91, 102).
Aa
White text reads best on this color (7.36:1).
About this color
#375B66 is a dark, muted teal or cyan. In OKLCH its lightness is 45%, its chroma 0.045 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.033 away. White text reads best on it, at 7.36:1.
| Hue family | Teals and cyans |
| Lightness | dark (45%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #375B66 |
| RGB | rgb(55, 91, 102) |
| HSL | hsl(194, 30%, 31%) |
| OKLCH | oklch(44.9% 0.045 219.3) |
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 #375B66 | 7.36:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #375B66 | 2.85:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #375B66 text on white | 7.36:1 | AAA | Lc 85.5 | Fine for body text |
| #375B66 text on black | 2.85:1 | Fails | Lc -16.5 | Dividers and decoration only |
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
#CFDCE0
oklch(88.6% 0.015 218.1)
-
Step 300
300
#AFC5CC
oklch(80.9% 0.026 218.9)
-
Step 400
400
#84A7B3
oklch(70.6% 0.042 220.8)
-
Step 500
500
#6492A0
oklch(63.2% 0.054 218.8)
-
Step 600
600
#4A7C8B
oklch(55.7% 0.059 219.1)
-
Step 700
700
#3B6876
oklch(49.1% 0.054 220)
-
Step 800
800 (this color)
#375B66
oklch(44.9% 0.045 219.3)
-
Step 900
900
#2C464E
oklch(37.7% 0.034 219.2)
-
Step 950
950
#1A292E
oklch(27% 0.022 220.6)
#375B66 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) | #545967 | 0.039 |
| Deuteranopia (no green cones) | #4D5366 | 0.036 |
| Tritanopia (no blue cones) | #225F5E | 0.029 |
| Achromatopsia (no color) | #565656 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375B66
#375B66
oklch(44.9% 0.045 219.3)
- #6B4C42
#6B4C42
oklch(44.7% 0.045 38.6)
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 #375B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.033
- Petrol #005F6A ΔE 0.034
- Dark Green Blue #1F6357 ΔE 0.046
- Dark Aqua #05696B ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.049
- Deep Teal #00555A ΔE 0.049
- Slate #516572 ΔE 0.050
- Dusty Grape #545775 ΔE 0.051
Use #375B66 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.