#3F4874
Closest named color: Dusk (#4E5481). oklch(41.4% 0.075 273.9), rgb(63, 72, 116).
Aa
White text reads best on this color (8.78:1).
About this color
#3F4874 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.075 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.046 away. White text reads best on it, at 8.78:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #3F4874 |
| RGB | rgb(63, 72, 116) |
| HSL | hsl(230, 30%, 35%) |
| OKLCH | oklch(41.4% 0.075 273.9) |
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 #3F4874 | 8.78:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #3F4874 | 2.39:1 | Fails | Lc 14.0 | Not readable |
| #3F4874 text on white | 8.78:1 | AAA | Lc 90.0 | Preferred for body text |
| #3F4874 text on black | 2.39:1 | Fails | Lc -12.3 | Not readable |
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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#939ECD
oklch(70.8% 0.07 274.3)
-
Step 500
500
#7885C0
oklch(63% 0.09 274)
-
Step 600
600
#626EAC
oklch(55.5% 0.097 274.5)
-
Step 700
700
#515C94
oklch(49.1% 0.091 274.2)
-
Step 800
800 (this color)
#3F4874
oklch(41.4% 0.075 273.9)
-
Step 900
900
#383F60
oklch(37.7% 0.057 274.2)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#3F4874 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) | #384D76 | 0.016 |
| Deuteranopia (no green cones) | #344973 | 0.015 |
| Tritanopia (no blue cones) | #2D5158 | 0.067 |
| Achromatopsia (no color) | #4B4B4B | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4874
#3F4874
oklch(41.4% 0.075 273.9)
- #594A13
#594A13
oklch(41.3% 0.074 93.3)
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 #3F4874, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.046
- Light Navy #155084 ΔE 0.048
- Twilight #4E518B ΔE 0.050
- Dusk Blue #26538D ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.054
- YInMn Blue #415A77 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.056
Use #3F4874 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.