#3F50B8
Closest named color: Blue With A Hint Of Purple (#533CC6). oklch(47.9% 0.164 271.7), rgb(63, 80, 184).
Aa
White text reads best on this color (6.88:1).
About this color
#3F50B8 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.164 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Blue With A Hint Of Purple (#533CC6), ΔE 0.053 away. White text reads best on it, at 6.88:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Blue With A Hint Of Purple (#533CC6) |
| Black text | 3.05:1 |
| White text | 6.88:1 |
Values
| HEX | #3F50B8 |
| RGB | rgb(63, 80, 184) |
| HSL | hsl(232, 49%, 48%) |
| OKLCH | oklch(47.9% 0.164 271.7) |
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 #3F50B8 | 6.88:1 | AA | Lc -88.4 | Fine for body text |
| Black text on #3F50B8 | 3.05:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #3F50B8 text on white | 6.88:1 | AA | Lc 83.4 | Fine for body text |
| #3F50B8 text on black | 3.05:1 | AA large text | Lc -18.6 | 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
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#AEBEF5
oklch(80.9% 0.08 271.9)
-
Step 400
400
#859BF0
oklch(70.8% 0.127 271.8)
-
Step 500
500
#687FEB
oklch(63.1% 0.163 271.9)
-
Step 600
600
#5166D9
oklch(55.6% 0.177 271.7)
-
Step 700
700 (this color)
#3F50B8
oklch(47.9% 0.164 271.7)
-
Step 800
800
#364598
oklch(42.6% 0.136 271.7)
-
Step 900
900
#2E3B79
oklch(37.6% 0.106 271.5)
-
Step 950
950
#1B2347
oklch(27% 0.068 271.8)
#3F50B8 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) | #0060BC | 0.051 |
| Deuteranopia (no green cones) | #0055B6 | 0.043 |
| Tritanopia (no blue cones) | #00697C | 0.136 |
| Achromatopsia (no color) | #5A5A5A | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F50B8
#3F50B8
oklch(47.9% 0.164 271.7)
- #715B00
#715B00
oklch(47.9% 0.098 92.4)
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 #3F50B8, 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 0.053
- Blue Blue #2242C7 ΔE 0.054
- Iris #6258C4 ΔE 0.059
- Majorelle Blue #3F37C9 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.060
- Blurple #5539CC ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.063
- Blueberry #464196 ΔE 0.064
Use #3F50B8 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.