#3F47A5
Closest named color: Blueberry (#464196). oklch(44.6% 0.15 274.9), rgb(63, 71, 165).
Aa
White text reads best on this color (7.90:1).
About this color
#3F47A5 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.150 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.029 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #3F47A5 |
| RGB | rgb(63, 71, 165) |
| HSL | hsl(235, 45%, 45%) |
| OKLCH | oklch(44.6% 0.15 274.9) |
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 #3F47A5 | 7.90:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #3F47A5 | 2.65:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #3F47A5 text on white | 7.90:1 | AAA | Lc 87.1 | Fine for body text |
| #3F47A5 text on black | 2.65:1 | Fails | Lc -15.0 | 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
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#B0BDFA
oklch(81% 0.088 275)
-
Step 400
400
#8898F7
oklch(70.8% 0.14 275)
-
Step 500
500
#6C7BF3
oklch(63.1% 0.178 274.7)
-
Step 600
600
#5760E2
oklch(55.6% 0.195 275.1)
-
Step 700
700
#474FC4
oklch(49.1% 0.18 274.7)
-
Step 800
800 (this color)
#3F47A5
oklch(44.6% 0.15 274.9)
-
Step 900
900
#31387E
oklch(37.6% 0.117 275)
-
Step 950
950
#1D224A
oklch(27.1% 0.074 275)
#3F47A5 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) | #0056A8 | 0.054 |
| Deuteranopia (no green cones) | #004DA3 | 0.049 |
| Tritanopia (no blue cones) | #005D6F | 0.127 |
| Achromatopsia (no color) | #515151 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F47A5
#3F47A5
oklch(44.6% 0.15 274.9)
- #645300
#645300
oklch(44.6% 0.092 95.3)
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 #3F47A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.029
- Dark Slate Blue #483D8B ΔE 0.048
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.056
- Twilight #4E518B ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.064
Use #3F47A5 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.