#3F405F
Closest named color: Dark Grey Blue (#29465B). oklch(38.4% 0.053 282.2), rgb(63, 64, 95).
Aa
White text reads best on this color (9.95:1).
About this color
#3F405F is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.053 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 9.95:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.10:1 |
| White text | 9.95:1 |
Values
| HEX | #3F405F |
| RGB | rgb(63, 64, 95) |
| HSL | hsl(238, 20%, 31%) |
| OKLCH | oklch(38.4% 0.053 282.2) |
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 #3F405F | 9.95:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3F405F | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #3F405F text on white | 9.95:1 | AAA | Lc 93.1 | Preferred for body text |
| #3F405F text on black | 2.10:1 | Fails | Lc -9.4 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D6D8E8
oklch(88.5% 0.022 280.3)
-
Step 300
300
#BCBEDA
oklch(80.9% 0.039 282.2)
-
Step 400
400
#9A9CC8
oklch(70.7% 0.064 282.6)
-
Step 500
500
#8284B9
oklch(63.2% 0.079 282.2)
-
Step 600
600
#6B6DA5
oklch(55.6% 0.086 281.6)
-
Step 700
700
#5A5A8E
oklch(49% 0.083 282.9)
-
Step 800
800
#494A73
oklch(42.7% 0.068 282.1)
-
Step 900
900 (this color)
#3F405F
oklch(38.4% 0.053 282.2)
-
Step 950
950
#242436
oklch(26.9% 0.033 283.9)
#3F405F 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) | #374460 | 0.016 |
| Deuteranopia (no green cones) | #36425E | 0.015 |
| Tritanopia (no blue cones) | #37464B | 0.047 |
| Achromatopsia (no color) | #434343 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F405F
#3F405F
oklch(38.4% 0.053 282.2)
- #494522
#494522
oklch(38.5% 0.053 102.8)
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 #3F405F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.052
- Onyx #343A40 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.064
- Dark Slate Gray #2F4F4F ΔE 0.065
- Twilight Blue #0A437A ΔE 0.068
Use #3F405F 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.