#3F48B8
Closest named color: Blue With A Hint Of Purple (#533CC6). oklch(46.4% 0.174 273.9), rgb(63, 72, 184).
Aa
White text reads best on this color (7.41:1).
About this color
#3F48B8 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.174 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blue With A Hint Of Purple (#533CC6), ΔE 0.042 away. White text reads best on it, at 7.41:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Blue With A Hint Of Purple (#533CC6) |
| Black text | 2.83:1 |
| White text | 7.41:1 |
Values
| HEX | #3F48B8 |
| RGB | rgb(63, 72, 184) |
| HSL | hsl(236, 49%, 48%) |
| OKLCH | oklch(46.4% 0.174 273.9) |
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 #3F48B8 | 7.41:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #3F48B8 | 2.83:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #3F48B8 text on white | 7.41:1 | AAA | Lc 85.3 | Fine for body text |
| #3F48B8 text on black | 2.83:1 | Fails | Lc -16.7 | 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
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AFBDF8
oklch(80.9% 0.085 274)
-
Step 400
400
#8799F4
oklch(70.7% 0.135 274)
-
Step 500
500
#6B7DF0
oklch(63.2% 0.172 273.8)
-
Step 600
600
#5562DF
oklch(55.6% 0.189 274)
-
Step 700
700 (this color)
#3F48B8
oklch(46.4% 0.174 273.9)
-
Step 800
800
#39439C
oklch(42.7% 0.144 273.8)
-
Step 900
900
#30397C
oklch(37.6% 0.113 273.9)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#3F48B8 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) | #005BBC | 0.056 |
| Deuteranopia (no green cones) | #0050B6 | 0.046 |
| Tritanopia (no blue cones) | #006479 | 0.144 |
| Achromatopsia (no color) | #555555 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F48B8
#3F48B8
oklch(46.4% 0.174 273.9)
- #6B5700
#6B5700
oklch(46.3% 0.095 93.4)
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 #3F48B8, 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 0.042
- Majorelle Blue #3F37C9 ΔE 0.043
- Blue Blue #2242C7 ΔE 0.043
- Blurple #5539CC ΔE 0.051
- Blueberry #464196 ΔE 0.057
- Bluey Purple #6241C7 ΔE 0.059
- Sapphire #2138AB ΔE 0.060
- Warm Blue #4B57DB ΔE 0.068
Use #3F48B8 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.