#375B63
Closest named color: Petrol (#005F6A). oklch(44.7% 0.043 213.3), rgb(55, 91, 99).
Aa
White text reads best on this color (7.39:1).
About this color
#375B63 is a dark, muted teal or cyan. In OKLCH its lightness is 45%, its chroma 0.043 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.034 away. White text reads best on it, at 7.39:1.
| Hue family | Teals and cyans |
| Lightness | dark (45%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.83:1 |
| White text | 7.39:1 |
Values
| HEX | #375B63 |
| RGB | rgb(55, 91, 99) |
| HSL | hsl(191, 29%, 30%) |
| OKLCH | oklch(44.7% 0.043 213.3) |
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 #375B63 | 7.39:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #375B63 | 2.83:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #375B63 text on white | 7.39:1 | AAA | Lc 85.6 | Fine for body text |
| #375B63 text on black | 2.83:1 | Fails | Lc -16.4 | 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
#CFDCDF
oklch(88.6% 0.015 213.1)
-
Step 300
300
#AFC5CA
oklch(80.8% 0.025 212.9)
-
Step 400
400
#84A8B0
oklch(70.8% 0.041 212.8)
-
Step 500
500
#64929C
oklch(63.1% 0.052 212.7)
-
Step 600
600
#4A7C87
oklch(55.5% 0.056 213.3)
-
Step 700
700
#3B6973
oklch(49.2% 0.053 213.2)
-
Step 800
800 (this color)
#375B63
oklch(44.7% 0.043 213.3)
-
Step 900
900
#2C464C
oklch(37.6% 0.033 213.8)
-
Step 950
950
#1A292D
oklch(26.9% 0.022 216.2)
#375B63 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) | #555963 | 0.040 |
| Deuteranopia (no green cones) | #4E5363 | 0.037 |
| Tritanopia (no blue cones) | #245E5D | 0.024 |
| Achromatopsia (no color) | #565656 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375B63
#375B63
oklch(44.7% 0.043 213.3)
- #6A4C45
#6A4C45
oklch(44.7% 0.043 33.5)
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 #375B63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.034
- YInMn Blue #415A77 ΔE 0.038
- Dark Green Blue #1F6357 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.046
- Dark Aqua #05696B ΔE 0.047
- Deep Teal #00555A ΔE 0.048
- Slate #516572 ΔE 0.052
- Dusty Grape #545775 ΔE 0.054
Use #375B63 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.