#3F5359
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.8% 0.027 218.1), rgb(63, 83, 89).
Aa
White text reads best on this color (8.09:1).
About this color
#3F5359 is a dark close to neutral grey. In OKLCH its lightness is 43%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.09:1.
| Hue family | Neutrals |
| Lightness | dark (43%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.59:1 |
| White text | 8.09:1 |
Values
| HEX | #3F5359 |
| RGB | rgb(63, 83, 89) |
| HSL | hsl(194, 17%, 30%) |
| OKLCH | oklch(42.8% 0.027 218.1) |
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 #3F5359 | 8.09:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #3F5359 | 2.59:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F5359 text on white | 8.09:1 | AAA | Lc 88.0 | Fine for body text |
| #3F5359 text on black | 2.59:1 | Fails | Lc -14.1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EBEC
oklch(93.7% 0.005 214.3)
-
Step 200
200
#D3DBDD
oklch(88.6% 0.009 214.3)
-
Step 300
300
#B6C3C7
oklch(80.8% 0.015 218.1)
-
Step 400
400
#90A5AB
oklch(70.8% 0.025 216.8)
-
Step 500
500
#758F96
oklch(63.2% 0.031 215.9)
-
Step 600
600
#5D7981
oklch(55.7% 0.035 217.1)
-
Step 700
700
#4C656D
oklch(49% 0.032 219.4)
-
Step 800
800 (this color)
#3F5359
oklch(42.8% 0.027 218.1)
-
Step 900
900
#354449
oklch(37.6% 0.021 220.1)
-
Step 950
950
#1F282B
oklch(26.9% 0.014 220.1)
#3F5359 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) | #4F5259 | 0.023 |
| Deuteranopia (no green cones) | #4B4E59 | 0.022 |
| Tritanopia (no blue cones) | #375555 | 0.015 |
| Achromatopsia (no color) | #505050 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5359
#3F5359
oklch(42.8% 0.027 218.1)
- #5D4A45
#5D4A45
oklch(42.7% 0.027 35.2)
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 #3F5359, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Deep Teal #00555A ΔE 0.049
- YInMn Blue #415A77 ΔE 0.049
- Petrol #005F6A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.056
- Dusty Grape #545775 ΔE 0.058
- Dark Green Blue #1F6357 ΔE 0.058
Use #3F5359 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.