#3F406B
Closest named color: Dark Grey Blue (#29465B). oklch(39.1% 0.072 281.5), rgb(63, 64, 107).
Aa
White text reads best on this color (9.73:1).
About this color
#3F406B is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.072 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.048 away. White text reads best on it, at 9.73:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.15:1 |
| White text | 9.73:1 |
Values
| HEX | #3F406B |
| RGB | rgb(63, 64, 107) |
| HSL | hsl(239, 26%, 33%) |
| OKLCH | oklch(39.1% 0.072 281.5) |
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 #3F406B | 9.73:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #3F406B | 2.15:1 | Fails | Lc 11.4 | Not readable |
| #3F406B text on white | 9.73:1 | AAA | Lc 92.5 | Preferred for body text |
| #3F406B text on black | 2.15:1 | Fails | Lc -9.9 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E8E9F4
oklch(93.6% 0.015 281.9)
-
Step 200
200
#D5D7ED
oklch(88.4% 0.03 281.6)
-
Step 300
300
#BABDE4
oklch(80.9% 0.055 281.6)
-
Step 400
400
#979AD6
oklch(70.6% 0.087 281.7)
-
Step 500
500
#7E81CB
oklch(63.2% 0.111 281)
-
Step 600
600
#6869B8
oklch(55.6% 0.121 281.2)
-
Step 700
700
#57579E
oklch(49.1% 0.112 281.5)
-
Step 800
800
#474780
oklch(42.6% 0.093 281.7)
-
Step 900
900 (this color)
#3F406B
oklch(39.1% 0.072 281.5)
-
Step 950
950
#23233C
oklch(26.9% 0.046 282.9)
#3F406B 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) | #32466D | 0.024 |
| Deuteranopia (no green cones) | #2F436A | 0.024 |
| Tritanopia (no blue cones) | #324850 | 0.062 |
| Achromatopsia (no color) | #444444 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F406B
#3F406B
oklch(39.1% 0.072 281.5)
- #4D4610
#4D4610
oklch(39% 0.072 101.7)
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 #3F406B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.058
- Charcoal #264653 ΔE 0.062
- Light Navy #155084 ΔE 0.065
- Cobalt #1E488F ΔE 0.069
- Dusk #4E5481 ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.070
Use #3F406B 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.