#3F4983
Closest named color: Twilight (#4E518B). oklch(42.6% 0.097 274.2), rgb(63, 73, 131).
Aa
White text reads best on this color (8.42:1).
About this color
#3F4983 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.097 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.035 away. White text reads best on it, at 8.42:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.49:1 |
| White text | 8.42:1 |
Values
| HEX | #3F4983 |
| RGB | rgb(63, 73, 131) |
| HSL | hsl(231, 35%, 38%) |
| OKLCH | oklch(42.6% 0.097 274.2) |
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 #3F4983 | 8.42:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #3F4983 | 2.49:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #3F4983 text on white | 8.42:1 | AAA | Lc 88.9 | Fine for body text |
| #3F4983 text on black | 2.49:1 | Fails | Lc -13.3 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE6
oklch(81% 0.056 273.8)
-
Step 400
400
#8F9DD9
oklch(70.8% 0.089 273.8)
-
Step 500
500
#7483CF
oklch(63.1% 0.116 274.1)
-
Step 600
600
#5E6BBC
oklch(55.5% 0.126 274.7)
-
Step 700
700
#4D59A2
oklch(49% 0.117 274.2)
-
Step 800
800 (this color)
#3F4983
oklch(42.6% 0.097 274.2)
-
Step 900
900
#363E69
oklch(37.8% 0.074 274.3)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#3F4983 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) | #315085 | 0.024 |
| Deuteranopia (no green cones) | #2B4B82 | 0.025 |
| Tritanopia (no blue cones) | #23555F | 0.086 |
| Achromatopsia (no color) | #4D4D4D | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4983
#3F4983
oklch(42.6% 0.097 274.2)
- #5E4D00
#5E4D00
oklch(42.5% 0.087 94.3)
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 #3F4983, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.035
- Dusk Blue #26538D ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.038
- Blueberry #464196 ΔE 0.041
- Dusk #4E5481 ΔE 0.042
- Cobalt #1E488F ΔE 0.042
- Light Navy #155084 ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.050
Use #3F4983 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.