#3F4084
Closest named color: Dark Slate Blue (#483D8B). oklch(40.7% 0.111 279.6), rgb(63, 64, 132).
Aa
White text reads best on this color (9.21:1).
About this color
#3F4084 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.111 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.020 away. White text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #3F4084 |
| RGB | rgb(63, 64, 132) |
| HSL | hsl(239, 35%, 38%) |
| OKLCH | oklch(40.7% 0.111 279.6) |
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 #3F4084 | 9.21:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #3F4084 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #3F4084 text on white | 9.21:1 | AAA | Lc 91.1 | Preferred for body text |
| #3F4084 text on black | 2.27:1 | Fails | Lc -11.3 | 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
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F1
oklch(88.5% 0.036 280.4)
-
Step 300
300
#B7BDEB
oklch(80.9% 0.065 279)
-
Step 400
400
#9399E1
oklch(70.6% 0.105 279.7)
-
Step 500
500
#7A7FD8
oklch(63.2% 0.133 279.4)
-
Step 600
600
#6466C5
oklch(55.5% 0.144 279.7)
-
Step 700
700
#5354AA
oklch(49% 0.134 279.7)
-
Step 800
800 (this color)
#3F4084
oklch(40.7% 0.111 279.6)
-
Step 900
900
#393B6E
oklch(37.7% 0.086 279.7)
-
Step 950
950
#212341
oklch(27% 0.055 279.1)
#3F4084 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) | #204A86 | 0.042 |
| Deuteranopia (no green cones) | #194583 | 0.044 |
| Tritanopia (no blue cones) | #234F5B | 0.098 |
| Achromatopsia (no color) | #474747 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4084
#3F4084
oklch(40.7% 0.111 279.6)
- #554A00
#554A00
oklch(40.8% 0.085 99.5)
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 #3F4084, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.020
- Blueberry #464196 ΔE 0.032
- Cobalt #1E488F ΔE 0.043
- Twilight #4E518B ΔE 0.055
- Dusk Blue #26538D ΔE 0.056
- Twilight Blue #0A437A ΔE 0.058
- Light Navy #155084 ΔE 0.058
- Dusk #4E5481 ΔE 0.065
Use #3F4084 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.