#3F4582
Closest named color: Dark Slate Blue (#483D8B). oklch(41.7% 0.101 276.8), rgb(63, 69, 130).
Aa
White text reads best on this color (8.80:1).
About this color
#3F4582 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.101 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.030 away. White text reads best on it, at 8.80:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #3F4582 |
| RGB | rgb(63, 69, 130) |
| HSL | hsl(235, 35%, 38%) |
| OKLCH | oklch(41.7% 0.101 276.8) |
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 #3F4582 | 8.80:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #3F4582 | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #3F4582 text on white | 8.80:1 | AAA | Lc 90.0 | Fine for body text |
| #3F4582 text on black | 2.38:1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D8EF
oklch(88.5% 0.032 276)
-
Step 300
300
#B6BEE7
oklch(80.9% 0.059 276.4)
-
Step 400
400
#919BDB
oklch(70.6% 0.094 276.9)
-
Step 500
500
#7781D1
oklch(63% 0.121 276.9)
-
Step 600
600
#616ABF
oklch(55.7% 0.131 276.7)
-
Step 700
700
#5058A4
oklch(49.2% 0.121 276.5)
-
Step 800
800 (this color)
#3F4582
oklch(41.7% 0.101 276.8)
-
Step 900
900
#373D6B
oklch(37.8% 0.079 276.3)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#3F4582 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) | #2B4D84 | 0.031 |
| Deuteranopia (no green cones) | #254881 | 0.032 |
| Tritanopia (no blue cones) | #24525D | 0.089 |
| Achromatopsia (no color) | #4A4A4A | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4582
#3F4582
oklch(41.7% 0.101 276.8)
- #5A4C00
#5A4C00
oklch(41.8% 0.086 96.9)
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 #3F4582, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.030
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.042
- Twilight #4E518B ΔE 0.044
- Dusk Blue #26538D ΔE 0.046
- Light Navy #155084 ΔE 0.049
- Dusk #4E5481 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.057
Use #3F4582 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.