#3F48A8
Closest named color: Blueberry (#464196). oklch(45.1% 0.152 274.5), rgb(63, 72, 168).
Aa
White text reads best on this color (7.76:1).
About this color
#3F48A8 is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.152 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.034 away. White text reads best on it, at 7.76:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.70:1 |
| White text | 7.76:1 |
Values
| HEX | #3F48A8 |
| RGB | rgb(63, 72, 168) |
| HSL | hsl(235, 45%, 45%) |
| OKLCH | oklch(45.1% 0.152 274.5) |
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 #3F48A8 | 7.76:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #3F48A8 | 2.70:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #3F48A8 text on white | 7.76:1 | AAA | Lc 86.6 | Fine for body text |
| #3F48A8 text on black | 2.70:1 | Fails | Lc -15.5 | 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
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#AFBDFB
oklch(81% 0.089 274.4)
-
Step 400
400
#8698F9
oklch(70.7% 0.143 274.2)
-
Step 500
500
#6B7BF5
oklch(63.1% 0.181 274.4)
-
Step 600
600
#5560E4
oklch(55.6% 0.198 274.4)
-
Step 700
700
#464EC6
oklch(49% 0.184 274.5)
-
Step 800
800 (this color)
#3F48A8
oklch(45.1% 0.152 274.5)
-
Step 900
900
#30387F
oklch(37.6% 0.119 274.3)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#3F48A8 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) | #0057AB | 0.053 |
| Deuteranopia (no green cones) | #004EA6 | 0.048 |
| Tritanopia (no blue cones) | #005F71 | 0.129 |
| Achromatopsia (no color) | #525252 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F48A8
#3F48A8
oklch(45.1% 0.152 274.5)
- #665400
#665400
oklch(45.1% 0.092 94.6)
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 #3F48A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.034
- Dark Slate Blue #483D8B ΔE 0.053
- Cobalt #1E488F ΔE 0.056
- Sapphire #2138AB ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Twilight #4E518B ΔE 0.061
- Blue Blue #2242C7 ΔE 0.061
- Dusk Blue #26538D ΔE 0.062
Use #3F48A8 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.