#3A4381
Closest named color: Dark Slate Blue (#483D8B). oklch(40.8% 0.104 274.7), rgb(58, 67, 129).
Aa
White text reads best on this color (9.13:1).
About this color
#3A4381 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.104 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 9.13:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.29:1 |
| White text | 9.13:1 |
Values
| HEX | #3A4381 |
| RGB | rgb(58, 67, 129) |
| HSL | hsl(232, 38%, 37%) |
| OKLCH | oklch(40.8% 0.104 274.7) |
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 #3A4381 | 9.13:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #3A4381 | 2.29:1 | Fails | Lc 13.1 | Not readable |
| #3A4381 text on white | 9.13:1 | AAA | Lc 90.9 | Preferred for body text |
| #3A4381 text on black | 2.29:1 | Fails | Lc -11.5 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B4BEE8
oklch(80.8% 0.06 274.5)
-
Step 400
400
#8E9CDD
oklch(70.7% 0.097 274.3)
-
Step 500
500
#7482D4
oklch(63.1% 0.124 274.9)
-
Step 600
600
#5D6AC1
oklch(55.6% 0.135 274.8)
-
Step 700
700
#4D58A7
oklch(49.1% 0.126 274.8)
-
Step 800
800 (this color)
#3A4381
oklch(40.8% 0.104 274.7)
-
Step 900
900
#353D6C
oklch(37.7% 0.081 274.6)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#3A4381 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) | #274B83 | 0.029 |
| Deuteranopia (no green cones) | #1F4580 | 0.032 |
| Tritanopia (no blue cones) | #19515B | 0.093 |
| Achromatopsia (no color) | #484848 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4381
#3A4381
oklch(40.8% 0.104 274.7)
- #584900
#584900
oklch(40.9% 0.084 95.5)
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 #3A4381, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.040
- Light Navy #155084 ΔE 0.047
- Dusk Blue #26538D ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Twilight #4E518B ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.060
Use #3A4381 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.