#3A3B84
Closest named color: Dark Slate Blue (#483D8B). oklch(39.3% 0.12 278.8), rgb(58, 59, 132).
Aa
White text reads best on this color (9.81:1).
About this color
#3A3B84 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.120 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.027 away. White text reads best on it, at 9.81:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.13:1 |
| White text | 9.81:1 |
Values
| HEX | #3A3B84 |
| RGB | rgb(58, 59, 132) |
| HSL | hsl(239, 39%, 37%) |
| OKLCH | oklch(39.3% 0.12 278.8) |
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 #3A3B84 | 9.81:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #3A3B84 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #3A3B84 text on white | 9.81:1 | AAA | Lc 92.5 | Preferred for body text |
| #3A3B84 text on black | 2.13:1 | Fails | Lc -9.9 | 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 900.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E9FC
oklch(93.7% 0.026 278.7)
-
Step 200
200
#D1D6FB
oklch(88.4% 0.051 279.2)
-
Step 300
300
#B3BBFA
oklch(80.8% 0.089 278.6)
-
Step 400
400
#8E95F8
oklch(70.6% 0.144 279)
-
Step 500
500
#7577F5
oklch(63.1% 0.184 279)
-
Step 600
600
#5F5CE4
oklch(55.6% 0.2 278.6)
-
Step 700
700
#4F4BC6
oklch(49.1% 0.186 278.5)
-
Step 800
800
#413EA0
oklch(42.7% 0.154 279)
-
Step 900
900 (this color)
#3A3B84
oklch(39.3% 0.12 278.8)
-
Step 950
950
#1F214A
oklch(27.1% 0.075 278.1)
#3A3B84 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) | #104787 | 0.049 |
| Deuteranopia (no green cones) | #024182 | 0.052 |
| Tritanopia (no blue cones) | #174C59 | 0.105 |
| Achromatopsia (no color) | #434343 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3B84
#3A3B84
oklch(39.3% 0.12 278.8)
- #514600
#514600
oklch(39.3% 0.082 99)
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 #3A3B84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.027
- Blueberry #464196 ΔE 0.039
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.054
- Light Navy #155084 ΔE 0.065
- Dusk Blue #26538D ΔE 0.067
- Twilight #4E518B ΔE 0.071
- Sapphire #2138AB ΔE 0.072
Use #3A3B84 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.