#3F4F91
Closest named color: Twilight (#4E518B). oklch(44.8% 0.11 271.1), rgb(63, 79, 145).
Aa
White text reads best on this color (7.66:1).
About this color
#3F4F91 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.110 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.025 away. White text reads best on it, at 7.66:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.73:1 |
| White text | 7.66:1 |
Values
| HEX | #3F4F91 |
| RGB | rgb(63, 79, 145) |
| HSL | hsl(228, 39%, 41%) |
| OKLCH | oklch(44.8% 0.11 271.1) |
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 #3F4F91 | 7.66:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #3F4F91 | 2.73:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #3F4F91 text on white | 7.66:1 | AAA | Lc 86.5 | Fine for body text |
| #3F4F91 text on black | 2.73:1 | Fails | Lc -15.6 | Dividers and decoration only |
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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F1
oklch(88.4% 0.035 271.5)
-
Step 300
300
#B1BFEB
oklch(80.9% 0.064 271.1)
-
Step 400
400
#899DE1
oklch(70.7% 0.102 271.1)
-
Step 500
500
#6D83D8
oklch(63.1% 0.13 271.3)
-
Step 600
600
#566BC6
oklch(55.6% 0.143 271.3)
-
Step 700
700
#4659AB
oklch(49.1% 0.132 271)
-
Step 800
800 (this color)
#3F4F91
oklch(44.8% 0.11 271.1)
-
Step 900
900
#313E6F
oklch(37.8% 0.085 270.7)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#3F4F91 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) | #325793 | 0.025 |
| Deuteranopia (no green cones) | #285090 | 0.026 |
| Tritanopia (no blue cones) | #115D69 | 0.097 |
| Achromatopsia (no color) | #535353 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4F91
#3F4F91
oklch(44.8% 0.11 271.1)
- #685200
#685200
oklch(44.8% 0.092 90.8)
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 #3F4F91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.025
- Dusk Blue #26538D ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.034
- Blueberry #464196 ΔE 0.039
- Dusk #4E5481 ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.041
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.048
Use #3F4F91 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.