#3F47B1
Closest named color: Blueberry (#464196). oklch(45.6% 0.166 274.4), rgb(63, 71, 177).
Aa
White text reads best on this color (7.64:1).
About this color
#3F47B1 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.166 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.046 away. White text reads best on it, at 7.64:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #3F47B1 |
| RGB | rgb(63, 71, 177) |
| HSL | hsl(236, 48%, 47%) |
| OKLCH | oklch(45.6% 0.166 274.4) |
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 #3F47B1 | 7.64:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #3F47B1 | 2.74:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #3F47B1 text on white | 7.64:1 | AAA | Lc 86.1 | Fine for body text |
| #3F47B1 text on black | 2.74:1 | Fails | Lc -15.9 | 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 800.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FE
oklch(88.5% 0.055 275)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#545CEE
oklch(55.6% 0.216 274.5)
-
Step 700
700
#454ACF
oklch(49.1% 0.201 274.5)
-
Step 800
800 (this color)
#3F47B1
oklch(45.6% 0.166 274.4)
-
Step 900
900
#2F3785
oklch(37.8% 0.129 274)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#3F47B1 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) | #0059B5 | 0.056 |
| Deuteranopia (no green cones) | #004EAF | 0.048 |
| Tritanopia (no blue cones) | #006175 | 0.138 |
| Achromatopsia (no color) | #535353 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F47B1
#3F47B1
oklch(45.6% 0.166 274.4)
- #685500
#685500
oklch(45.5% 0.093 93.9)
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 #3F47B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.046
- Blue With A Hint Of Purple #533CC6 ΔE 0.048
- Blue Blue #2242C7 ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.049
- Sapphire #2138AB ΔE 0.056
- Blurple #5539CC ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.065
Use #3F47B1 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.