#3F565F
Closest named color: YInMn Blue (#415A77). oklch(43.8% 0.032 224), rgb(63, 86, 95).
Aa
White text reads best on this color (7.75:1).
About this color
#3F565F is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.032 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.039 away. White text reads best on it, at 7.75:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.70:1 |
| White text | 7.75:1 |
Values
| HEX | #3F565F |
| RGB | rgb(63, 86, 95) |
| HSL | hsl(197, 20%, 31%) |
| OKLCH | oklch(43.8% 0.032 224) |
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 #3F565F | 7.75:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #3F565F | 2.70:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #3F565F text on white | 7.75:1 | AAA | Lc 86.9 | Fine for body text |
| #3F565F text on black | 2.70:1 | Fails | Lc -15.2 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDE
oklch(88.5% 0.011 219.6)
-
Step 300
300
#B5C3CA
oklch(80.9% 0.018 229.1)
-
Step 400
400
#8EA5AE
oklch(70.7% 0.029 223.4)
-
Step 500
500
#718F9B
oklch(63.1% 0.038 224.2)
-
Step 600
600
#597985
oklch(55.6% 0.041 223)
-
Step 700
700
#496671
oklch(49.2% 0.038 223.4)
-
Step 800
800 (this color)
#3F565F
oklch(43.8% 0.032 224)
-
Step 900
900
#34454B
oklch(37.8% 0.024 221.5)
-
Step 950
950
#1E282C
oklch(26.9% 0.016 224.2)
#3F565F 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) | #515560 | 0.026 |
| Deuteranopia (no green cones) | #4C515F | 0.023 |
| Tritanopia (no blue cones) | #345959 | 0.021 |
| Achromatopsia (no color) | #525252 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F565F
#3F565F
oklch(43.8% 0.032 224)
- #614D44
#614D44
oklch(43.8% 0.031 45.5)
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 #3F565F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.039
- Dark Slate Gray #2F4F4F ΔE 0.039
- Petrol #005F6A ΔE 0.047
- Dusty Grape #545775 ΔE 0.049
- Deep Teal #00555A ΔE 0.051
- Dark Green Blue #1F6357 ΔE 0.055
- Slate #516572 ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.061
Use #3F565F 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.