#3F4C83
Closest named color: Twilight (#4E518B). oklch(43.3% 0.092 272), rgb(63, 76, 131).
Aa
White text reads best on this color (8.16:1).
About this color
#3F4C83 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.092 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.030 away. White text reads best on it, at 8.16:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #3F4C83 |
| RGB | rgb(63, 76, 131) |
| HSL | hsl(229, 35%, 38%) |
| OKLCH | oklch(43.3% 0.092 272) |
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 #3F4C83 | 8.16:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #3F4C83 | 2.57:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #3F4C83 text on white | 8.16:1 | AAA | Lc 88.1 | Fine for body text |
| #3F4C83 text on black | 2.57:1 | Fails | Lc -14.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
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
#B4BFE4
oklch(80.8% 0.054 272.1)
-
Step 400
400
#8D9ED7
oklch(70.8% 0.086 271.3)
-
Step 500
500
#7285CC
oklch(63.2% 0.109 271.6)
-
Step 600
600
#5B6DB9
oklch(55.6% 0.12 271.9)
-
Step 700
700
#4B5BA0
oklch(49.2% 0.112 271.9)
-
Step 800
800 (this color)
#3F4C83
oklch(43.3% 0.092 272)
-
Step 900
900
#343F68
oklch(37.8% 0.072 271.3)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#3F4C83 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) | #365285 | 0.019 |
| Deuteranopia (no green cones) | #2F4D82 | 0.020 |
| Tritanopia (no blue cones) | #225861 | 0.083 |
| Achromatopsia (no color) | #4F4F4F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4C83
#3F4C83
oklch(43.3% 0.092 272)
- #624E00
#624E00
oklch(43.2% 0.088 91.8)
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 #3F4C83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.030
- Dusk Blue #26538D ΔE 0.033
- Dusk #4E5481 ΔE 0.035
- Light Navy #155084 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Cobalt #1E488F ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.046
Use #3F4C83 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.