#3F52A0
Closest named color: Denim Blue (#3B5B92). oklch(46.5% 0.128 270.5), rgb(63, 82, 160).
Aa
White text reads best on this color (7.17:1).
About this color
#3F52A0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.128 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.037 away. White text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.92:1 |
| White text | 7.17:1 |
Values
| HEX | #3F52A0 |
| RGB | rgb(63, 82, 160) |
| HSL | hsl(228, 43%, 44%) |
| OKLCH | oklch(46.5% 0.128 270.5) |
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 #3F52A0 | 7.17:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #3F52A0 | 2.92:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #3F52A0 text on white | 7.17:1 | AAA | Lc 84.7 | Fine for body text |
| #3F52A0 text on black | 2.92:1 | Fails | Lc -17.3 | 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 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F1
oklch(88.6% 0.034 269.3)
-
Step 300
300
#B1BFEA
oklch(80.8% 0.063 270.8)
-
Step 400
400
#899DDF
oklch(70.6% 0.1 270.8)
-
Step 500
500
#6D84D6
oklch(63.2% 0.126 270.6)
-
Step 600
600
#556CC3
oklch(55.6% 0.137 270.3)
-
Step 700
700 (this color)
#3F52A0
oklch(46.5% 0.128 270.5)
-
Step 800
800
#394A88
oklch(42.7% 0.105 270)
-
Step 900
900
#313E6D
oklch(37.7% 0.082 270.4)
-
Step 950
950
#1D2540
oklch(27.1% 0.052 270.2)
#3F52A0 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) | #2B5CA3 | 0.031 |
| Deuteranopia (no green cones) | #1B539E | 0.035 |
| Tritanopia (no blue cones) | #006471 | 0.112 |
| Achromatopsia (no color) | #575757 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F52A0
#3F52A0
oklch(46.5% 0.128 270.5)
- #6E5600
#6E5600
oklch(46.5% 0.095 89.9)
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 #3F52A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.037
- Twilight #4E518B ΔE 0.039
- Dusk Blue #26538D ΔE 0.043
- Blueberry #464196 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.052
- Dusk #4E5481 ΔE 0.056
- Cobalt #1E488F ΔE 0.056
Use #3F52A0 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.