#3F535E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(43% 0.031 232.5), rgb(63, 83, 94).
Aa
White text reads best on this color (8.04:1).
About this color
#3F535E is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.031 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.61:1 |
| White text | 8.04:1 |
Values
| HEX | #3F535E |
| RGB | rgb(63, 83, 94) |
| HSL | hsl(201, 20%, 31%) |
| OKLCH | oklch(43% 0.031 232.5) |
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 #3F535E | 8.04:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #3F535E | 2.61:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #3F535E text on white | 8.04:1 | AAA | Lc 87.9 | Fine for body text |
| #3F535E text on black | 2.61:1 | Fails | Lc -14.3 | 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
#D3DADF
oklch(88.4% 0.01 238.5)
-
Step 300
300
#B6C3CA
oklch(80.9% 0.017 231)
-
Step 400
400
#90A4B0
oklch(70.7% 0.029 234.2)
-
Step 500
500
#748E9C
oklch(63.1% 0.036 231.6)
-
Step 600
600
#5C7887
oklch(55.6% 0.04 231.8)
-
Step 700
700
#4C6572
oklch(49.2% 0.036 231)
-
Step 800
800 (this color)
#3F535E
oklch(43% 0.031 232.5)
-
Step 900
900
#35444C
oklch(37.7% 0.024 231.5)
-
Step 950
950
#1F282D
oklch(27% 0.016 232.4)
#3F535E 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) | #4E525F | 0.022 |
| Deuteranopia (no green cones) | #494F5E | 0.018 |
| Tritanopia (no blue cones) | #355656 | 0.023 |
| Achromatopsia (no color) | #505050 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F535E
#3F535E
oklch(43% 0.031 232.5)
- #5E4B40
#5E4B40
oklch(42.9% 0.031 51.7)
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 #3F535E, 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 0.042
- Deep Teal #00555A ΔE 0.050
- Dusty Grape #545775 ΔE 0.051
- Petrol #005F6A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
- Charcoal #264653 ΔE 0.056
- Dark Green Blue #1F6357 ΔE 0.062
Use #3F535E 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.