#3A4F78
Closest named color: Dusk (#4E5481). oklch(42.9% 0.073 263), rgb(58, 79, 120).
Aa
White text reads best on this color (8.17:1).
About this color
#3A4F78 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.073 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.036 away. White text reads best on it, at 8.17:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.56:1 |
| White text | 8.17:1 |
Values
| HEX | #3A4F78 |
| RGB | rgb(58, 79, 120) |
| HSL | hsl(220, 35%, 35%) |
| OKLCH | oklch(42.9% 0.073 263) |
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 #3A4F78 | 8.17:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #3A4F78 | 2.56:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #3A4F78 text on white | 8.17:1 | AAA | Lc 88.2 | Fine for body text |
| #3A4F78 text on black | 2.56:1 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D1D9E9
oklch(88.4% 0.024 264.4)
-
Step 300
300
#B2C1DD
oklch(80.9% 0.043 263)
-
Step 400
400
#8AA1CC
oklch(70.7% 0.068 262.8)
-
Step 500
500
#6D89BF
oklch(63% 0.088 263)
-
Step 600
600
#5572AB
oklch(55.5% 0.096 263.1)
-
Step 700
700
#466093
oklch(49.2% 0.088 263)
-
Step 800
800 (this color)
#3A4F78
oklch(42.9% 0.073 263)
-
Step 900
900
#314160
oklch(37.6% 0.057 263)
-
Step 950
950
#1D2638
oklch(26.9% 0.036 263.7)
#3A4F78 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) | #3F527A | 0.012 |
| Deuteranopia (no green cones) | #384D77 | 0.007 |
| Tritanopia (no blue cones) | #1F585E | 0.066 |
| Achromatopsia (no color) | #4F4F4F | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4F78
#3A4F78
oklch(42.9% 0.073 263)
- #634C1A
#634C1A
oklch(43% 0.073 83.7)
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 #3A4F78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.037
- Light Navy #155084 ΔE 0.038
- Dusk Blue #26538D ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.042
- Twilight #4E518B ΔE 0.044
- Dusty Grape #545775 ΔE 0.048
Use #3A4F78 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.