#3A3173
Closest named color: Dark Slate Blue (#483D8B). oklch(36.1% 0.109 285.8), rgb(58, 49, 115).
Aa
White text reads best on this color (11.24:1).
About this color
#3A3173 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.109 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.056 away. White text reads best on it, at 11.24:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.86:1 |
| White text | 11.24:1 |
Values
| HEX | #3A3173 |
| RGB | rgb(58, 49, 115) |
| HSL | hsl(248, 40%, 32%) |
| OKLCH | oklch(36.1% 0.109 285.8) |
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 #3A3173 | 11.24:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #3A3173 | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #3A3173 text on white | 11.24:1 | AAA | Lc 95.7 | Preferred for body text |
| #3A3173 text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F7
oklch(88.4% 0.047 286.8)
-
Step 300
300
#BBB9F4
oklch(80.8% 0.083 285.9)
-
Step 400
400
#9A93EE
oklch(70.6% 0.131 286)
-
Step 500
500
#8376E9
oklch(63.2% 0.168 285.7)
-
Step 600
600
#6E5BD7
oklch(55.6% 0.183 285.8)
-
Step 700
700
#5C4ABA
oklch(49% 0.169 285.7)
-
Step 800
800
#4B3E97
oklch(42.8% 0.14 285.5)
-
Step 900
900 (this color)
#3A3173
oklch(36.1% 0.109 285.8)
-
Step 950
950
#242046
oklch(27% 0.069 285.6)
#3A3173 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) | #0C3D75 | 0.057 |
| Deuteranopia (no green cones) | #0A3972 | 0.056 |
| Tritanopia (no blue cones) | #27404D | 0.092 |
| Achromatopsia (no color) | #3B3B3B | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3173
#3A3173
oklch(36.1% 0.109 285.8)
- #433F00
#433F00
oklch(36% 0.077 105.6)
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 #3A3173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.056
- Marine Blue #01386A ΔE 0.065
- Twilight Blue #0A437A ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.068
- Blueberry #464196 ΔE 0.073
- Marine #042E60 ΔE 0.076
- Cobalt #1E488F ΔE 0.077
- Indigo #4B0082 ΔE 0.083
Use #3A3173 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.