#3F51B2
Closest named color: Blueberry (#464196). oklch(47.6% 0.155 271.4), rgb(63, 81, 178).
Aa
White text reads best on this color (6.92:1).
About this color
#3F51B2 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.155 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.058 away. White text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #3F51B2 |
| RGB | rgb(63, 81, 178) |
| HSL | hsl(231, 48%, 47%) |
| OKLCH | oklch(47.6% 0.155 271.4) |
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 #3F51B2 | 6.92:1 | AA | Lc -88.6 | Fine for body text |
| Black text on #3F51B2 | 3.03:1 | AA large text | Lc 20.4 | Dividers and decoration only |
| #3F51B2 text on white | 6.92:1 | AA | Lc 83.6 | Fine for body text |
| #3F51B2 text on black | 3.03:1 | AA large text | Lc -18.3 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBFF2
oklch(81% 0.074 271.1)
-
Step 400
400
#869CEB
oklch(70.8% 0.119 271.3)
-
Step 500
500
#6981E5
oklch(63.2% 0.152 271.3)
-
Step 600
600
#5268D3
oklch(55.7% 0.166 271.3)
-
Step 700
700 (this color)
#3F51B2
oklch(47.6% 0.155 271.4)
-
Step 800
800
#374794
oklch(42.8% 0.127 271.2)
-
Step 900
900
#2F3C76
oklch(37.7% 0.1 271.4)
-
Step 950
950
#1B2445
oklch(27.1% 0.063 270.3)
#3F51B2 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) | #0A5FB5 | 0.047 |
| Deuteranopia (no green cones) | #0055B0 | 0.043 |
| Tritanopia (no blue cones) | #006879 | 0.130 |
| Achromatopsia (no color) | #5A5A5A | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F51B2
#3F51B2
oklch(47.6% 0.155 271.4)
- #715A00
#715A00
oklch(47.7% 0.098 91.4)
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 #3F51B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Blue Blue #2242C7 ΔE 0.061
- Iris #6258C4 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.062
- Twilight #4E518B ΔE 0.066
- Mid Blue #276AB3 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.067
Use #3F51B2 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.