#3F4DA1
Closest named color: Blueberry (#464196). oklch(45.5% 0.136 272.7), rgb(63, 77, 161).
Aa
White text reads best on this color (7.53:1).
About this color
#3F4DA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.136 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.034 away. White text reads best on it, at 7.53:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.78:1 |
| White text | 7.53:1 |
Values
| HEX | #3F4DA1 |
| RGB | rgb(63, 77, 161) |
| HSL | hsl(231, 44%, 44%) |
| OKLCH | oklch(45.5% 0.136 272.7) |
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 #3F4DA1 | 7.53:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #3F4DA1 | 2.78:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #3F4DA1 text on white | 7.53:1 | AAA | Lc 85.9 | Fine for body text |
| #3F4DA1 text on black | 2.78:1 | Fails | Lc -16.1 | Dividers and decoration only |
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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F7
oklch(88.5% 0.044 272.7)
-
Step 300
300
#AFBEF5
oklch(80.9% 0.08 272.7)
-
Step 400
400
#869AF0
oklch(70.7% 0.128 272.8)
-
Step 500
500
#6A7FEA
oklch(63.1% 0.161 272.6)
-
Step 600
600
#5365D9
oklch(55.6% 0.177 272.6)
-
Step 700
700
#4453BC
oklch(49% 0.165 272.7)
-
Step 800
800 (this color)
#3F4DA1
oklch(45.5% 0.136 272.7)
-
Step 900
900
#303B79
oklch(37.8% 0.106 272.8)
-
Step 950
950
#1C2347
oklch(27.1% 0.067 272.9)
#3F4DA1 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) | #1E59A4 | 0.041 |
| Deuteranopia (no green cones) | #03509F | 0.046 |
| Tritanopia (no blue cones) | #00606F | 0.118 |
| Achromatopsia (no color) | #545454 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4DA1
#3F4DA1
oklch(45.5% 0.136 272.7)
- #695500
#695500
oklch(45.6% 0.093 93)
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 #3F4DA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.034
- Twilight #4E518B ΔE 0.045
- Dusk Blue #26538D ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.049
- Cobalt #1E488F ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Dusky Blue #475F94 ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.062
Use #3F4DA1 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.