#3F4E7D
Closest named color: Dusk (#4E5481). oklch(43.3% 0.08 269.4), rgb(63, 78, 125).
Aa
White text reads best on this color (8.08:1).
About this color
#3F4E7D is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.080 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.030 away. White text reads best on it, at 8.08:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.59:1 |
| White text | 8.08:1 |
Values
| HEX | #3F4E7D |
| RGB | rgb(63, 78, 125) |
| HSL | hsl(225, 33%, 37%) |
| OKLCH | oklch(43.3% 0.08 269.4) |
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 #3F4E7D | 8.08:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3F4E7D | 2.59:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #3F4E7D text on white | 8.08:1 | AAA | Lc 87.9 | Fine for body text |
| #3F4E7D text on black | 2.59:1 | Fails | Lc -14.2 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0E0
oklch(80.9% 0.047 269.1)
-
Step 400
400
#8E9FD0
oklch(70.7% 0.075 269.6)
-
Step 500
500
#7287C4
oklch(63.2% 0.095 269.1)
-
Step 600
600
#5B6FB0
oklch(55.5% 0.104 269.8)
-
Step 700
700
#4B5D98
oklch(49.1% 0.097 269.7)
-
Step 800
800 (this color)
#3F4E7D
oklch(43.3% 0.08 269.4)
-
Step 900
900
#344063
oklch(37.8% 0.062 268.9)
-
Step 950
950
#1F253A
oklch(26.9% 0.04 271.3)
#3F4E7D 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) | #3C537F | 0.014 |
| Deuteranopia (no green cones) | #364D7C | 0.013 |
| Tritanopia (no blue cones) | #27585F | 0.072 |
| Achromatopsia (no color) | #505050 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E7D
#3F4E7D
oklch(43.3% 0.08 269.4)
- #624E11
#624E11
oklch(43.3% 0.08 89.6)
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 #3F4E7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.030
- Twilight #4E518B ΔE 0.033
- Dusk Blue #26538D ΔE 0.036
- Light Navy Blue #2E5A88 ΔE 0.038
- YInMn Blue #415A77 ΔE 0.041
- Light Navy #155084 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.045
- Dusty Grape #545775 ΔE 0.047
Use #3F4E7D 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.