#3F4CB3
Closest named color: Blue With A Hint Of Purple (#533CC6). oklch(46.7% 0.163 273), rgb(63, 76, 179).
Aa
White text reads best on this color (7.25:1).
About this color
#3F4CB3 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.163 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blue With A Hint Of Purple (#533CC6), ΔE 0.051 away. White text reads best on it, at 7.25:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Blue With A Hint Of Purple (#533CC6) |
| Black text | 2.89:1 |
| White text | 7.25:1 |
Values
| HEX | #3F4CB3 |
| RGB | rgb(63, 76, 179) |
| HSL | hsl(233, 48%, 47%) |
| OKLCH | oklch(46.7% 0.163 273) |
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 #3F4CB3 | 7.25:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #3F4CB3 | 2.89:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #3F4CB3 text on white | 7.25:1 | AAA | Lc 84.8 | Fine for body text |
| #3F4CB3 text on black | 2.89:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F7
oklch(88.5% 0.044 272.7)
-
Step 300
300
#AFBEF4
oklch(80.9% 0.078 272.5)
-
Step 400
400
#879AEF
oklch(70.7% 0.126 273.2)
-
Step 500
500
#6B7FE9
oklch(63.1% 0.16 273)
-
Step 600
600
#5465D8
oklch(55.6% 0.176 273)
-
Step 700
700 (this color)
#3F4CB3
oklch(46.7% 0.163 273)
-
Step 800
800
#394597
oklch(42.7% 0.134 273.1)
-
Step 900
900
#303B78
oklch(37.7% 0.104 272.8)
-
Step 950
950
#1C2346
oklch(27% 0.065 272.8)
#3F4CB3 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) | #005CB6 | 0.052 |
| Deuteranopia (no green cones) | #0052B1 | 0.045 |
| Tritanopia (no blue cones) | #006578 | 0.136 |
| Achromatopsia (no color) | #575757 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4CB3
#3F4CB3
oklch(46.7% 0.163 273)
- #6C5800
#6C5800
oklch(46.7% 0.096 93.5)
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 #3F4CB3, 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 0.051
- Blue Blue #2242C7 ΔE 0.052
- Blueberry #464196 ΔE 0.053
- Majorelle Blue #3F37C9 ΔE 0.056
- Blurple #5539CC ΔE 0.061
- Bluey Purple #6241C7 ΔE 0.064
- Sapphire #2138AB ΔE 0.066
- Iris #6258C4 ΔE 0.067
Use #3F4CB3 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.