#3F405B
Closest named color: Dark Grey Blue (#29465B). oklch(38.2% 0.046 282.4), rgb(63, 64, 91).
Aa
White text reads best on this color (10.02:1).
About this color
#3F405B is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.046 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 10.02:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.09:1 |
| White text | 10.02:1 |
Values
| HEX | #3F405B |
| RGB | rgb(63, 64, 91) |
| HSL | hsl(238, 18%, 30%) |
| OKLCH | oklch(38.2% 0.046 282.4) |
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 #3F405B | 10.02:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #3F405B | 2.09:1 | Fails | Lc 10.7 | Not readable |
| #3F405B text on white | 10.02:1 | AAA | Lc 93.3 | Preferred for body text |
| #3F405B text on black | 2.09:1 | Fails | Lc -9.2 | 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 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D7D8E6
oklch(88.6% 0.019 282.7)
-
Step 300
300
#BDBED7
oklch(80.9% 0.035 283.8)
-
Step 400
400
#9B9DC3
oklch(70.8% 0.055 282.5)
-
Step 500
500
#8384B3
oklch(63% 0.07 283.2)
-
Step 600
600
#6C6E9F
oklch(55.6% 0.076 281.8)
-
Step 700
700
#5A5C88
oklch(49.2% 0.07 281.5)
-
Step 800
800
#4A4B6F
oklch(42.8% 0.059 282.4)
-
Step 900
900 (this color)
#3F405B
oklch(38.2% 0.046 282.4)
-
Step 950
950
#242534
oklch(27% 0.028 281.4)
#3F405B 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) | #38435C | 0.013 |
| Deuteranopia (no green cones) | #37415A | 0.013 |
| Tritanopia (no blue cones) | #384549 | 0.041 |
| Achromatopsia (no color) | #424242 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F405B
#3F405B
oklch(38.2% 0.046 282.4)
- #484426
#484426
oklch(38.3% 0.046 101.7)
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 #3F405B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal #264653 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.046
- Onyx #343A40 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.056
- Dark Slate Gray #2F4F4F ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.064
- Gunmetal #293241 ΔE 0.070
Use #3F405B 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.