#3F4E7C
Closest named color: Dusk (#4E5481). oklch(43.3% 0.079 269.2), rgb(63, 78, 124).
Aa
White text reads best on this color (8.10:1).
About this color
#3F4E7C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.079 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 8.10:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.59:1 |
| White text | 8.10:1 |
Values
| HEX | #3F4E7C |
| RGB | rgb(63, 78, 124) |
| HSL | hsl(225, 33%, 37%) |
| OKLCH | oklch(43.3% 0.079 269.2) |
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 #3F4E7C | 8.10:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3F4E7C | 2.59:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #3F4E7C text on white | 8.10:1 | AAA | Lc 88.0 | Fine for body text |
| #3F4E7C 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
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8E9FCF
oklch(70.7% 0.073 269.4)
-
Step 500
500
#7287C3
oklch(63.1% 0.094 268.9)
-
Step 600
600
#5B70AF
oklch(55.6% 0.101 269)
-
Step 700
700
#4B5D97
oklch(49.1% 0.096 269.6)
-
Step 800
800 (this color)
#3F4E7C
oklch(43.3% 0.079 269.2)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1F263A
oklch(27.2% 0.039 269)
#3F4E7C 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) | #3D537E | 0.014 |
| Deuteranopia (no green cones) | #374D7B | 0.012 |
| Tritanopia (no blue cones) | #27585F | 0.071 |
| Achromatopsia (no color) | #505050 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4E7C
#3F4E7C
oklch(43.3% 0.079 269.2)
- #624E13
#624E13
oklch(43.3% 0.079 89.2)
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 #3F4E7C, 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 0.035
- Dusk Blue #26538D ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.038
- YInMn Blue #415A77 ΔE 0.040
- Light Navy #155084 ΔE 0.041
- Dusty Grape #545775 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.046
Use #3F4E7C 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.