#3F4A8E
Closest named color: Blueberry (#464196). oklch(43.5% 0.112 273.9), rgb(63, 74, 142).
Aa
White text reads best on this color (8.13:1).
About this color
#3F4A8E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.112 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.029 away. White text reads best on it, at 8.13:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #3F4A8E |
| RGB | rgb(63, 74, 142) |
| HSL | hsl(232, 39%, 40%) |
| OKLCH | oklch(43.5% 0.112 273.9) |
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 #3F4A8E | 8.13:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3F4A8E | 2.58:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F4A8E text on white | 8.13:1 | AAA | Lc 88.0 | Fine for body text |
| #3F4A8E text on black | 2.58:1 | Fails | Lc -14.2 | 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 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEEC
oklch(80.9% 0.066 274.3)
-
Step 400
400
#8C9CE2
oklch(70.8% 0.104 273.6)
-
Step 500
500
#7181DA
oklch(63% 0.135 274.2)
-
Step 600
600
#5A69C7
oklch(55.6% 0.145 273.9)
-
Step 700
700
#4A57AC
oklch(49.1% 0.135 273.8)
-
Step 800
800 (this color)
#3F4A8E
oklch(43.5% 0.112 273.9)
-
Step 900
900
#343D6F
oklch(37.8% 0.086 273.9)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#3F4A8E 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) | #2B5391 | 0.031 |
| Deuteranopia (no green cones) | #214C8D | 0.034 |
| Tritanopia (no blue cones) | #175965 | 0.099 |
| Achromatopsia (no color) | #4F4F4F | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4A8E
#3F4A8E
oklch(43.5% 0.112 273.9)
- #625000
#625000
oklch(43.7% 0.09 93.9)
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 #3F4A8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.029
- Twilight #4E518B ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.035
- Dusk Blue #26538D ΔE 0.035
- Cobalt #1E488F ΔE 0.038
- Dusk #4E5481 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.047
- Light Navy #155084 ΔE 0.048
Use #3F4A8E 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.