#3A388A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.2% 0.133 279.4), rgb(58, 56, 138).
Aa
White text reads best on this color (9.94:1).
About this color
#3A388A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.133 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 9.94:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.11:1 |
| White text | 9.94:1 |
Values
| HEX | #3A388A |
| RGB | rgb(58, 56, 138) |
| HSL | hsl(241, 42%, 38%) |
| OKLCH | oklch(39.2% 0.133 279.4) |
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 #3A388A | 9.94:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #3A388A | 2.11:1 | Fails | Lc 11.2 | Not readable |
| #3A388A text on white | 9.94:1 | AAA | Lc 92.7 | Preferred for body text |
| #3A388A text on black | 2.11:1 | Fails | Lc -9.7 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FD
oklch(93.5% 0.029 279.4)
-
Step 200
200
#D1D6FE
oklch(88.5% 0.055 279.6)
-
Step 300
300
#B3BAFF
oklch(80.8% 0.098 279.5)
-
Step 400
400
#8E93FF
oklch(70.6% 0.156 279.6)
-
Step 500
500
#7573FF
oklch(63% 0.202 279.5)
-
Step 600
600
#6156EF
oklch(55.6% 0.221 279.6)
-
Step 700
700
#5145D0
oklch(49.2% 0.205 279.6)
-
Step 800
800
#413AA8
oklch(42.7% 0.17 279.2)
-
Step 900
900 (this color)
#3A388A
oklch(39.2% 0.133 279.4)
-
Step 950
950
#1F1F4E
oklch(26.9% 0.084 279.1)
#3A388A 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) | #00468D | 0.056 |
| Deuteranopia (no green cones) | #004088 | 0.054 |
| Tritanopia (no blue cones) | #0F4B5B | 0.114 |
| Achromatopsia (no color) | #434343 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A388A
#3A388A
oklch(39.2% 0.133 279.4)
- #504600
#504600
oklch(39.2% 0.082 100)
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 #3A388A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.049
- Twilight Blue #0A437A ΔE 0.061
- Sapphire #2138AB ΔE 0.062
- Light Navy #155084 ΔE 0.073
- Dusk Blue #26538D ΔE 0.074
- Twilight #4E518B ΔE 0.078
Use #3A388A 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.