#3F409F
Closest named color: Blueberry (#464196). oklch(42.8% 0.15 277.5), rgb(63, 64, 159).
Aa
White text reads best on this color (8.58:1).
About this color
#3F409F is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.150 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.019 away. White text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #3F409F |
| RGB | rgb(63, 64, 159) |
| HSL | hsl(239, 43%, 44%) |
| OKLCH | oklch(42.8% 0.15 277.5) |
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 #3F409F | 8.58:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #3F409F | 2.44:1 | Fails | Lc 14.9 | Not readable |
| #3F409F text on white | 8.58:1 | AAA | Lc 89.1 | Fine for body text |
| #3F409F text on black | 2.44:1 | Fails | Lc -13.1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7FA
oklch(88.6% 0.049 277.7)
-
Step 300
300
#B2BCF9
oklch(80.9% 0.087 277.1)
-
Step 400
400
#8C96F7
oklch(70.6% 0.141 277.7)
-
Step 500
500
#7279F3
oklch(63.1% 0.179 277.5)
-
Step 600
600
#5D5EE2
oklch(55.6% 0.196 277.6)
-
Step 700
700
#4D4DC4
oklch(49.2% 0.181 277.4)
-
Step 800
800 (this color)
#3F409F
oklch(42.8% 0.15 277.5)
-
Step 900
900
#35377E
oklch(37.7% 0.118 277.9)
-
Step 950
950
#1E214A
oklch(27% 0.075 277)
#3F409F 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) | #0050A2 | 0.058 |
| Deuteranopia (no green cones) | #00489D | 0.053 |
| Tritanopia (no blue cones) | #005769 | 0.130 |
| Achromatopsia (no color) | #4C4C4C | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F409F
#3F409F
oklch(42.8% 0.15 277.5)
- #5D4F00
#5D4F00
oklch(42.9% 0.088 97.4)
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 #3F409F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.019
- Dark Slate Blue #483D8B ΔE 0.036
- Sapphire #2138AB ΔE 0.049
- Cobalt #1E488F ΔE 0.050
- Twilight #4E518B ΔE 0.065
- Dusk Blue #26538D ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
Use #3F409F 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.