#3F51A2
Closest named color: Denim Blue (#3B5B92). oklch(46.4% 0.132 271), rgb(63, 81, 162).
Aa
White text reads best on this color (7.21:1).
About this color
#3F51A2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.132 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.041 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.91:1 |
| White text | 7.21:1 |
Values
| HEX | #3F51A2 |
| RGB | rgb(63, 81, 162) |
| HSL | hsl(229, 44%, 44%) |
| OKLCH | oklch(46.4% 0.132 271) |
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 #3F51A2 | 7.21:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #3F51A2 | 2.91:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #3F51A2 text on white | 7.21:1 | AAA | Lc 84.8 | Fine for body text |
| #3F51A2 text on black | 2.91:1 | Fails | Lc -17.2 | 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
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F1
oklch(88.4% 0.035 271.5)
-
Step 300
300
#B1BFEB
oklch(80.9% 0.064 271.1)
-
Step 400
400
#899DE1
oklch(70.7% 0.102 271.1)
-
Step 500
500
#6D83D8
oklch(63.1% 0.13 271.3)
-
Step 600
600
#556BC6
oklch(55.6% 0.143 270.9)
-
Step 700
700 (this color)
#3F51A2
oklch(46.4% 0.132 271)
-
Step 800
800
#39498A
oklch(42.6% 0.109 270.8)
-
Step 900
900
#313E6F
oklch(37.8% 0.085 270.7)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#3F51A2 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) | #275CA5 | 0.035 |
| Deuteranopia (no green cones) | #1353A0 | 0.039 |
| Tritanopia (no blue cones) | #006372 | 0.113 |
| Achromatopsia (no color) | #575757 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F51A2
#3F51A2
oklch(46.4% 0.132 271)
- #6D5600
#6D5600
oklch(46.3% 0.095 90.7)
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 #3F51A2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.041
- Twilight #4E518B ΔE 0.042
- Blueberry #464196 ΔE 0.044
- Dusk Blue #26538D ΔE 0.046
- Dusky Blue #475F94 ΔE 0.051
- Cobalt #1E488F ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.056
- Dusk #4E5481 ΔE 0.059
Use #3F51A2 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.