#3F4E5C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.7% 0.03 246.7), rgb(63, 78, 92).
Aa
White text reads best on this color (8.55:1).
About this color
#3F4E5C is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.030 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.033 away. White text reads best on it, at 8.55:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #3F4E5C |
| RGB | rgb(63, 78, 92) |
| HSL | hsl(209, 19%, 30%) |
| OKLCH | oklch(41.7% 0.03 246.7) |
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 #3F4E5C | 8.55:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #3F4E5C | 2.45:1 | Fails | Lc 14.6 | Not readable |
| #3F4E5C text on white | 8.55:1 | AAA | Lc 89.4 | Fine for body text |
| #3F4E5C text on black | 2.45:1 | Fails | Lc -12.8 | 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
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B8C2CC
oklch(80.9% 0.018 248)
-
Step 400
400
#93A3B2
oklch(70.8% 0.028 246.5)
-
Step 500
500
#788C9F
oklch(63.1% 0.037 247)
-
Step 600
600
#617689
oklch(55.6% 0.039 245.9)
-
Step 700
700
#506375
oklch(49.1% 0.037 247.2)
-
Step 800
800 (this color)
#3F4E5C
oklch(41.7% 0.03 246.7)
-
Step 900
900
#38434E
oklch(37.7% 0.024 248.5)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#3F4E5C 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) | #494E5D | 0.015 |
| Deuteranopia (no green cones) | #454B5C | 0.012 |
| Tritanopia (no blue cones) | #365152 | 0.026 |
| Achromatopsia (no color) | #4C4C4C | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E5C
#3F4E5C
oklch(41.7% 0.03 246.7)
- #58493B
#58493B
oklch(41.7% 0.03 64.9)
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 #3F4E5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal #264653 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.052
- Deep Teal #00555A ΔE 0.053
- Dusty Grape #545775 ΔE 0.057
- Dark Teal #014D4E ΔE 0.062
Use #3F4E5C 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.