#3F4E83
Closest named color: Twilight (#4E518B). oklch(43.7% 0.09 270.4), rgb(63, 78, 131).
Aa
White text reads best on this color (7.98:1).
About this color
#3F4E83 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.090 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.027 away. White text reads best on it, at 7.98:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.62:1 |
| White text | 7.98:1 |
Values
| HEX | #3F4E83 |
| RGB | rgb(63, 78, 131) |
| HSL | hsl(227, 35%, 38%) |
| OKLCH | oklch(43.7% 0.09 270.4) |
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 #3F4E83 | 7.98:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #3F4E83 | 2.62:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #3F4E83 text on white | 7.98:1 | AAA | Lc 87.6 | Fine for body text |
| #3F4E83 text on black | 2.62:1 | Fails | Lc -14.6 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B3C0E3
oklch(80.9% 0.052 269.2)
-
Step 400
400
#8C9ED6
oklch(70.6% 0.085 270.4)
-
Step 500
500
#7185CA
oklch(63% 0.107 270.8)
-
Step 600
600
#5A6EB7
oklch(55.6% 0.116 270.7)
-
Step 700
700
#4A5C9E
oklch(49.2% 0.108 270.5)
-
Step 800
800 (this color)
#3F4E83
oklch(43.7% 0.09 270.4)
-
Step 900
900
#333F67
oklch(37.7% 0.07 270.1)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#3F4E83 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) | #395485 | 0.018 |
| Deuteranopia (no green cones) | #324E82 | 0.017 |
| Tritanopia (no blue cones) | #225962 | 0.080 |
| Achromatopsia (no color) | #515151 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E83
#3F4E83
oklch(43.7% 0.09 270.4)
- #654F00
#654F00
oklch(43.8% 0.09 90.2)
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 #3F4E83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.027
- Dusk #4E5481 ΔE 0.030
- Dusk Blue #26538D ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.040
- Light Navy #155084 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.046
- Cobalt #1E488F ΔE 0.048
Use #3F4E83 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.