#3F4C71
Closest named color: Dusk (#4E5481). oklch(42.2% 0.064 268.8), rgb(63, 76, 113).
Aa
White text reads best on this color (8.45:1).
About this color
#3F4C71 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.064 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.041 away. White text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #3F4C71 |
| RGB | rgb(63, 76, 113) |
| HSL | hsl(224, 28%, 35%) |
| OKLCH | oklch(42.2% 0.064 268.8) |
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 #3F4C71 | 8.45:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #3F4C71 | 2.48:1 | Fails | Lc 14.9 | Not readable |
| #3F4C71 text on white | 8.45:1 | AAA | Lc 89.1 | Fine for body text |
| #3F4C71 text on black | 2.48:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF1
oklch(93.7% 0.01 267.4)
-
Step 200
200
#D3D9E7
oklch(88.5% 0.02 267.3)
-
Step 300
300
#B6C0DA
oklch(80.8% 0.038 268.8)
-
Step 400
400
#91A0C7
oklch(70.8% 0.06 268.4)
-
Step 500
500
#7688B9
oklch(63.2% 0.077 268.6)
-
Step 600
600
#5F71A5
oklch(55.6% 0.084 269)
-
Step 700
700
#4E5F8D
oklch(49.2% 0.077 268)
-
Step 800
800 (this color)
#3F4C71
oklch(42.2% 0.064 268.8)
-
Step 900
900
#36415C
oklch(37.8% 0.049 267)
-
Step 950
950
#202636
oklch(27% 0.031 268.4)
#3F4C71 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) | #3F4F73 | 0.009 |
| Deuteranopia (no green cones) | #3A4B70 | 0.008 |
| Tritanopia (no blue cones) | #2E5459 | 0.059 |
| Achromatopsia (no color) | #4D4D4D | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4C71
#3F4C71
oklch(42.2% 0.064 268.8)
- #5C4C21
#5C4C21
oklch(42.3% 0.064 89)
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 #3F4C71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.041
- YInMn Blue #415A77 ΔE 0.042
- Dusty Grape #545775 ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Twilight #4E518B ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
- Dusk Blue #26538D ΔE 0.051
Use #3F4C71 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.