#3F535B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.9% 0.028 224.3), rgb(63, 83, 91).
Aa
White text reads best on this color (8.07:1).
About this color
#3F535B is a dark close to neutral grey. In OKLCH its lightness is 43%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.032 away. White text reads best on it, at 8.07:1.
| Hue family | Neutrals |
| Lightness | dark (43%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.59:1 |
| White text | 8.07:1 |
Values
| HEX | #3F535B |
| RGB | rgb(63, 83, 91) |
| HSL | hsl(197, 18%, 30%) |
| OKLCH | oklch(42.9% 0.028 224.3) |
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 #3F535B | 8.07:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3F535B | 2.59:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F535B text on white | 8.07:1 | AAA | Lc 88.0 | Fine for body text |
| #3F535B text on black | 2.59:1 | Fails | Lc -14.2 | 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
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D3DADE
oklch(88.4% 0.009 232.4)
-
Step 300
300
#B6C3C9
oklch(80.9% 0.017 227)
-
Step 400
400
#90A4AD
oklch(70.6% 0.026 226.6)
-
Step 500
500
#748E99
oklch(63% 0.034 225.4)
-
Step 600
600
#5D7883
oklch(55.6% 0.036 224.7)
-
Step 700
700
#4C656F
oklch(49.1% 0.034 224.4)
-
Step 800
800 (this color)
#3F535B
oklch(42.9% 0.028 224.3)
-
Step 900
900
#35444A
oklch(37.6% 0.022 224.2)
-
Step 950
950
#1F282C
oklch(27% 0.015 226.6)
#3F535B 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) | #4F525B | 0.023 |
| Deuteranopia (no green cones) | #4A4E5B | 0.021 |
| Tritanopia (no blue cones) | #365655 | 0.020 |
| Achromatopsia (no color) | #505050 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F535B
#3F535B
oklch(42.9% 0.028 224.3)
- #5D4B43
#5D4B43
oklch(42.9% 0.028 45.3)
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 #3F535B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.032
- YInMn Blue #415A77 ΔE 0.046
- Deep Teal #00555A ΔE 0.049
- Petrol #005F6A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.054
- Dusty Grape #545775 ΔE 0.055
- Charcoal #264653 ΔE 0.056
- Dark Green Blue #1F6357 ΔE 0.060
Use #3F535B 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.