#3A3D72
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.089 278.9), rgb(58, 61, 114).
Aa
White text reads best on this color (10.04:1).
About this color
#3A3D72 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.089 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 10.04:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.04:1 |
Values
| HEX | #3A3D72 |
| RGB | rgb(58, 61, 114) |
| HSL | hsl(237, 33%, 34%) |
| OKLCH | oklch(38.5% 0.089 278.9) |
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 #3A3D72 | 10.04:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #3A3D72 | 2.09:1 | Fails | Lc 10.7 | Not readable |
| #3A3D72 text on white | 10.04:1 | AAA | Lc 93.2 | Preferred for body text |
| #3A3D72 text on black | 2.09:1 | Fails | Lc -9.3 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B7BDEC
oklch(81% 0.067 279.1)
-
Step 400
400
#9299E2
oklch(70.6% 0.107 279.1)
-
Step 500
500
#797FDA
oklch(63.2% 0.136 278.9)
-
Step 600
600
#6366C8
oklch(55.7% 0.149 279.1)
-
Step 700
700
#5254AD
oklch(49.1% 0.139 279)
-
Step 800
800
#43458C
oklch(42.7% 0.115 279.1)
-
Step 900
900 (this color)
#3A3D72
oklch(38.5% 0.089 278.9)
-
Step 950
950
#212341
oklch(27% 0.055 279.1)
#3A3D72 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) | #284474 | 0.029 |
| Deuteranopia (no green cones) | #244071 | 0.030 |
| Tritanopia (no blue cones) | #264852 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3D72
#3A3D72
oklch(38.5% 0.089 278.9)
- #4E4400
#4E4400
oklch(38.5% 0.08 99.8)
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 #3A3D72, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.058
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.063
- Blueberry #464196 ΔE 0.064
- Marine Blue #01386A ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.068
Use #3A3D72 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.