#3F4883
Closest named color: Dark Slate Blue (#483D8B). oklch(42.4% 0.098 274.9), rgb(63, 72, 131).
Aa
White text reads best on this color (8.51:1).
About this color
#3F4883 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.098 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.036 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #3F4883 |
| RGB | rgb(63, 72, 131) |
| HSL | hsl(232, 35%, 38%) |
| OKLCH | oklch(42.4% 0.098 274.9) |
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 #3F4883 | 8.51:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #3F4883 | 2.46:1 | Fails | Lc 14.8 | Not readable |
| #3F4883 text on white | 8.51:1 | AAA | Lc 89.2 | Fine for body text |
| #3F4883 text on black | 2.46:1 | Fails | Lc -13.1 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B5BEE6
oklch(80.8% 0.057 275.1)
-
Step 400
400
#909CDA
oklch(70.7% 0.092 275.4)
-
Step 500
500
#7583D0
oklch(63.2% 0.117 274.7)
-
Step 600
600
#5E6BBD
oklch(55.6% 0.127 274.7)
-
Step 700
700
#4E59A3
oklch(49.1% 0.118 274.8)
-
Step 800
800 (this color)
#3F4883
oklch(42.4% 0.098 274.9)
-
Step 900
900
#363D6A
oklch(37.6% 0.077 275.4)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#3F4883 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) | #304F85 | 0.025 |
| Deuteranopia (no green cones) | #294A82 | 0.027 |
| Tritanopia (no blue cones) | #23555F | 0.087 |
| Achromatopsia (no color) | #4D4D4D | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4883
#3F4883
oklch(42.4% 0.098 274.9)
- #5D4D00
#5D4D00
oklch(42.4% 0.087 95.2)
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 #3F4883, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.036
- Twilight #4E518B ΔE 0.037
- Dusk Blue #26538D ΔE 0.039
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.042
- Dusk #4E5481 ΔE 0.044
- Light Navy #155084 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.052
Use #3F4883 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.