#3F4A9A
Closest named color: Blueberry (#464196). oklch(44.4% 0.13 274), rgb(63, 74, 154).
Aa
White text reads best on this color (7.90:1).
About this color
#3F4A9A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.130 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.024 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #3F4A9A |
| RGB | rgb(63, 74, 154) |
| HSL | hsl(233, 42%, 43%) |
| OKLCH | oklch(44.4% 0.13 274) |
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 #3F4A9A | 7.90:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #3F4A9A | 2.65:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #3F4A9A text on white | 7.90:1 | AAA | Lc 87.2 | Fine for body text |
| #3F4A9A text on black | 2.65:1 | Fails | Lc -15.0 | 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
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BEF2
oklch(81% 0.075 273.7)
-
Step 400
400
#899AEC
oklch(70.7% 0.122 274)
-
Step 500
500
#6E7FE6
oklch(63.2% 0.155 274.1)
-
Step 600
600
#5766D4
oklch(55.6% 0.168 273.8)
-
Step 700
700
#4854B8
oklch(49.2% 0.157 274)
-
Step 800
800 (this color)
#3F4A9A
oklch(44.4% 0.13 274)
-
Step 900
900
#323B76
oklch(37.7% 0.1 274.1)
-
Step 950
950
#1D2345
oklch(27% 0.063 273.9)
#3F4A9A 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) | #1F559D | 0.040 |
| Deuteranopia (no green cones) | #0C4E98 | 0.045 |
| Tritanopia (no blue cones) | #005C6B | 0.114 |
| Achromatopsia (no color) | #515151 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4A9A
#3F4A9A
oklch(44.4% 0.13 274)
- #645200
#645200
oklch(44.4% 0.091 94.3)
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 #3F4A9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.024
- Dark Slate Blue #483D8B ΔE 0.040
- Twilight #4E518B ΔE 0.041
- Cobalt #1E488F ΔE 0.043
- Dusk Blue #26538D ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.051
- Dusk #4E5481 ΔE 0.059
- Light Navy #155084 ΔE 0.059
Use #3F4A9A 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.