#3F565A
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43.6% 0.029 209.4), rgb(63, 86, 90).
Aa
White text reads best on this color (7.80:1).
About this color
#3F565A is a dark close to neutral grey. In OKLCH its lightness is 44%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 7.80:1.
| Hue family | Neutrals |
| Lightness | dark (44%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.69:1 |
| White text | 7.80:1 |
Values
| HEX | #3F565A |
| RGB | rgb(63, 86, 90) |
| HSL | hsl(189, 18%, 30%) |
| OKLCH | oklch(43.6% 0.029 209.4) |
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 #3F565A | 7.80:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3F565A | 2.69:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3F565A text on white | 7.80:1 | AAA | Lc 87.1 | Fine for body text |
| #3F565A text on black | 2.69:1 | Fails | Lc -15.0 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D2DBDC
oklch(88.5% 0.01 204.9)
-
Step 300
300
#B5C4C6
oklch(80.9% 0.017 206.4)
-
Step 400
400
#8EA6AA
oklch(70.8% 0.027 208.7)
-
Step 500
500
#729095
oklch(63.2% 0.035 208.8)
-
Step 600
600
#5A7A7F
oklch(55.7% 0.037 208.1)
-
Step 700
700
#4A666B
oklch(49% 0.034 209.7)
-
Step 800
800 (this color)
#3F565A
oklch(43.6% 0.029 209.4)
-
Step 900
900
#344548
oklch(37.7% 0.022 209.5)
-
Step 950
950
#1F282A
oklch(26.9% 0.013 212.7)
#3F565A 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) | #52545A | 0.028 |
| Deuteranopia (no green cones) | #4D515A | 0.024 |
| Tritanopia (no blue cones) | #365857 | 0.014 |
| Achromatopsia (no color) | #525252 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F565A
#3F565A
oklch(43.6% 0.029 209.4)
- #604C48
#604C48
oklch(43.6% 0.028 31.3)
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 #3F565A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- YInMn Blue #415A77 ΔE 0.047
- Petrol #005F6A ΔE 0.049
- Deep Teal #00555A ΔE 0.049
- Dark Green Blue #1F6357 ΔE 0.051
- Dusty Grape #545775 ΔE 0.056
- Slate #516572 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.063
Use #3F565A 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.