#3F4C82
Closest named color: Twilight (#4E518B). oklch(43.2% 0.091 271.9), rgb(63, 76, 130).
Aa
White text reads best on this color (8.17:1).
About this color
#3F4C82 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.091 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.031 away. White text reads best on it, at 8.17:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.56:1 |
| White text | 8.17:1 |
Values
| HEX | #3F4C82 |
| RGB | rgb(63, 76, 130) |
| HSL | hsl(228, 35%, 38%) |
| OKLCH | oklch(43.2% 0.091 271.9) |
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 #3F4C82 | 8.17:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #3F4C82 | 2.56:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #3F4C82 text on white | 8.17:1 | AAA | Lc 88.2 | Fine for body text |
| #3F4C82 text on black | 2.56:1 | Fails | Lc -14.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B4BFE4
oklch(80.8% 0.054 272.1)
-
Step 400
400
#8E9ED6
oklch(70.8% 0.084 271.8)
-
Step 500
500
#7285CB
oklch(63.1% 0.108 271.5)
-
Step 600
600
#5B6DB8
oklch(55.5% 0.118 271.9)
-
Step 700
700
#4B5B9F
oklch(49.1% 0.11 271.8)
-
Step 800
800 (this color)
#3F4C82
oklch(43.2% 0.091 271.9)
-
Step 900
900
#343F67
oklch(37.8% 0.07 271.1)
-
Step 950
950
#1F253C
oklch(27% 0.044 272.1)
#3F4C82 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) | #375284 | 0.019 |
| Deuteranopia (no green cones) | #304C81 | 0.019 |
| Tritanopia (no blue cones) | #235760 | 0.081 |
| Achromatopsia (no color) | #4F4F4F | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4C82
#3F4C82
oklch(43.2% 0.091 271.9)
- #624E00
#624E00
oklch(43.2% 0.088 91.8)
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 #3F4C82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.031
- Dusk Blue #26538D ΔE 0.034
- Dusk #4E5481 ΔE 0.034
- Light Navy #155084 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.046
- Cobalt #1E488F ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.046
Use #3F4C82 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.