#3F51B4
Closest named color: Blue With A Hint Of Purple (#533CC6). oklch(47.7% 0.158 271.4), rgb(63, 81, 180).
Aa
White text reads best on this color (6.89:1).
About this color
#3F51B4 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.158 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blue With A Hint Of Purple (#533CC6), ΔE 0.058 away. White text reads best on it, at 6.89:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Blue With A Hint Of Purple (#533CC6) |
| Black text | 3.04:1 |
| White text | 6.89:1 |
Values
| HEX | #3F51B4 |
| RGB | rgb(63, 81, 180) |
| HSL | hsl(231, 48%, 48%) |
| OKLCH | oklch(47.7% 0.158 271.4) |
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 #3F51B4 | 6.89:1 | AA | Lc -88.5 | Fine for body text |
| Black text on #3F51B4 | 3.04:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #3F51B4 text on white | 6.89:1 | AA | Lc 83.5 | Fine for body text |
| #3F51B4 text on black | 3.04:1 | AA large text | Lc -18.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
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
#AEBEF3
oklch(80.8% 0.077 271.5)
-
Step 400
400
#859BED
oklch(70.6% 0.123 271.5)
-
Step 500
500
#6880E7
oklch(63% 0.157 271.4)
-
Step 600
600
#5167D5
oklch(55.5% 0.17 271.3)
-
Step 700
700 (this color)
#3F51B4
oklch(47.7% 0.158 271.4)
-
Step 800
800
#374695
oklch(42.7% 0.13 271.7)
-
Step 900
900
#2F3C77
oklch(37.8% 0.101 271.4)
-
Step 950
950
#1B2346
oklch(26.9% 0.066 271.6)
#3F51B4 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) | #025FB7 | 0.048 |
| Deuteranopia (no green cones) | #0055B2 | 0.043 |
| Tritanopia (no blue cones) | #00697A | 0.133 |
| Achromatopsia (no color) | #5A5A5A | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F51B4
#3F51B4
oklch(47.7% 0.158 271.4)
- #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 #3F51B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.059
- Blueberry #464196 ΔE 0.060
- Iris #6258C4 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.065
- Warm Blue #4B57DB ΔE 0.065
- Bluey Purple #6241C7 ΔE 0.066
Use #3F51B4 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.