#3F50A5
Closest named color: Blueberry (#464196). oklch(46.4% 0.138 271.5), rgb(63, 80, 165).
Aa
White text reads best on this color (7.23:1).
About this color
#3F50A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.138 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.043 away. White text reads best on it, at 7.23:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.90:1 |
| White text | 7.23:1 |
Values
| HEX | #3F50A5 |
| RGB | rgb(63, 80, 165) |
| HSL | hsl(230, 45%, 45%) |
| OKLCH | oklch(46.4% 0.138 271.5) |
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 #3F50A5 | 7.23:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #3F50A5 | 2.90:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #3F50A5 text on white | 7.23:1 | AAA | Lc 84.8 | Fine for body text |
| #3F50A5 text on black | 2.90:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B1BFED
oklch(81% 0.067 271.6)
-
Step 400
400
#899CE3
oklch(70.6% 0.106 272)
-
Step 500
500
#6C82DB
oklch(63% 0.136 271.5)
-
Step 600
600
#556AC9
oklch(55.6% 0.148 271.4)
-
Step 700
700 (this color)
#3F50A5
oklch(46.4% 0.138 271.5)
-
Step 800
800
#39488D
oklch(42.6% 0.115 271.5)
-
Step 900
900
#313D70
oklch(37.6% 0.088 271.6)
-
Step 950
950
#1D2442
oklch(27% 0.057 272.2)
#3F50A5 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) | #215CA8 | 0.039 |
| Deuteranopia (no green cones) | #0553A3 | 0.044 |
| Tritanopia (no blue cones) | #006473 | 0.119 |
| Achromatopsia (no color) | #575757 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F50A5
#3F50A5
oklch(46.4% 0.138 271.5)
- #6D5700
#6D5700
oklch(46.6% 0.095 91.7)
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 #3F50A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.047
- Twilight #4E518B ΔE 0.047
- Dusk Blue #26538D ΔE 0.050
- Dusky Blue #475F94 ΔE 0.056
- Cobalt #1E488F ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.062
Use #3F50A5 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.