#3F515F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.5% 0.032 241.9), rgb(63, 81, 95).
Aa
White text reads best on this color (8.22:1).
About this color
#3F515F is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.032 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.036 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #3F515F |
| RGB | rgb(63, 81, 95) |
| HSL | hsl(206, 20%, 31%) |
| OKLCH | oklch(42.5% 0.032 241.9) |
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 #3F515F | 8.22:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #3F515F | 2.55:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #3F515F text on white | 8.22:1 | AAA | Lc 88.4 | Fine for body text |
| #3F515F text on black | 2.55:1 | Fails | Lc -13.8 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B6C2CC
oklch(80.8% 0.019 243)
-
Step 400
400
#91A3B2
oklch(70.6% 0.03 243.3)
-
Step 500
500
#758D9F
oklch(63.1% 0.039 240.7)
-
Step 600
600
#5E778A
oklch(55.7% 0.042 241.2)
-
Step 700
700
#4D6475
oklch(49.1% 0.039 240.6)
-
Step 800
800 (this color)
#3F515F
oklch(42.5% 0.032 241.9)
-
Step 900
900
#36434E
oklch(37.6% 0.025 244)
-
Step 950
950
#20282E
oklch(27.2% 0.016 240.6)
#3F515F 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) | #4B5160 | 0.018 |
| Deuteranopia (no green cones) | #474D5F | 0.016 |
| Tritanopia (no blue cones) | #355455 | 0.026 |
| Achromatopsia (no color) | #4F4F4F | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F515F
#3F515F
oklch(42.5% 0.032 241.9)
- #5C4B3C
#5C4B3C
oklch(42.6% 0.033 63.2)
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 #3F515F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.036
- YInMn Blue #415A77 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.048
- Dusty Grape #545775 ΔE 0.051
- Deep Teal #00555A ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Petrol #005F6A ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.061
Use #3F515F 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.