#3F4BA8
Closest named color: Blueberry (#464196). oklch(45.6% 0.149 273.5), rgb(63, 75, 168).
Aa
White text reads best on this color (7.54:1).
About this color
#3F4BA8 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.149 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.037 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #3F4BA8 |
| RGB | rgb(63, 75, 168) |
| HSL | hsl(233, 45%, 45%) |
| OKLCH | oklch(45.6% 0.149 273.5) |
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 #3F4BA8 | 7.54:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #3F4BA8 | 2.78:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #3F4BA8 text on white | 7.54:1 | AAA | Lc 85.9 | Fine for body text |
| #3F4BA8 text on black | 2.78:1 | Fails | Lc -16.2 | 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 800.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#AEBDF9
oklch(80.8% 0.087 273.5)
-
Step 400
400
#8599F7
oklch(70.8% 0.139 273.3)
-
Step 500
500
#697CF3
oklch(63.1% 0.178 273.4)
-
Step 600
600
#5362E2
oklch(55.7% 0.193 273.3)
-
Step 700
700
#4450C4
oklch(49.1% 0.179 273.3)
-
Step 800
800 (this color)
#3F4BA8
oklch(45.6% 0.149 273.5)
-
Step 900
900
#2F397E
oklch(37.7% 0.116 273.3)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#3F4BA8 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) | #0559AB | 0.050 |
| Deuteranopia (no green cones) | #0050A6 | 0.047 |
| Tritanopia (no blue cones) | #006172 | 0.126 |
| Achromatopsia (no color) | #545454 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4BA8
#3F4BA8
oklch(45.6% 0.149 273.5)
- #695500
#695500
oklch(45.6% 0.093 93)
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 #3F4BA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.037
- Twilight #4E518B ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Cobalt #1E488F ΔE 0.057
- Dusk Blue #26538D ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Sapphire #2138AB ΔE 0.063
Use #3F4BA8 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.