#3A3A8E
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.136 278.3), rgb(58, 58, 142).
Aa
White text reads best on this color (9.65:1).
About this color
#3A3A8E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.136 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #3A3A8E |
| RGB | rgb(58, 58, 142) |
| HSL | hsl(240, 42%, 39%) |
| OKLCH | oklch(39.9% 0.136 278.3) |
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 #3A3A8E | 9.65:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #3A3A8E | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #3A3A8E text on white | 9.65:1 | AAA | Lc 92.0 | Preferred for body text |
| #3A3A8E text on black | 2.17:1 | Fails | Lc -10.4 | 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
#E5E8FE
oklch(93.5% 0.03 279.6)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7274FF
oklch(63% 0.202 278.3)
-
Step 600
600
#5E56F2
oklch(55.6% 0.225 278.4)
-
Step 700
700
#4E44D3
oklch(49.1% 0.211 278.4)
-
Step 800
800
#3F3AAB
oklch(42.8% 0.174 278)
-
Step 900
900 (this color)
#3A3A8E
oklch(39.9% 0.136 278.3)
-
Step 950
950
#1E1F4F
oklch(26.9% 0.086 278)
#3A3A8E 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) | #004891 | 0.055 |
| Deuteranopia (no green cones) | #00418C | 0.052 |
| Tritanopia (no blue cones) | #054E5E | 0.118 |
| Achromatopsia (no color) | #454545 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3A8E
#3A3A8E
oklch(39.9% 0.136 278.3)
- #534700
#534700
oklch(39.8% 0.082 98.2)
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 #3A3A8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.030
- Cobalt #1E488F ΔE 0.045
- Sapphire #2138AB ΔE 0.057
- Twilight Blue #0A437A ΔE 0.063
- Dusk Blue #26538D ΔE 0.069
- Light Navy #155084 ΔE 0.070
- Twilight #4E518B ΔE 0.074
Use #3A3A8E 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.