#3B306B
Closest named color: Prussian Blue (#1D3557). oklch(35.4% 0.099 288.9), rgb(59, 48, 107).
Aa
White text reads best on this color (11.53:1).
About this color
#3B306B is a dark, moderately saturated purple. In OKLCH its lightness is 35%, its chroma 0.099 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.060 away. White text reads best on it, at 11.53:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.53:1 |
Values
| HEX | #3B306B |
| RGB | rgb(59, 48, 107) |
| HSL | hsl(251, 38%, 30%) |
| OKLCH | oklch(35.4% 0.099 288.9) |
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 #3B306B | 11.53:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #3B306B | 1.82:1 | Fails | Lc 7.5 | Not readable |
| #3B306B text on white | 11.53:1 | AAA | Lc 96.4 | Preferred for body text |
| #3B306B text on black | 1.82:1 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F8
oklch(93.6% 0.021 288.9)
-
Step 200
200
#D7D5F3
oklch(88.4% 0.041 288.6)
-
Step 300
300
#BEB9EE
oklch(80.8% 0.074 288.9)
-
Step 400
400
#9E94E6
oklch(70.8% 0.118 288.6)
-
Step 500
500
#8877DE
oklch(63.1% 0.151 288.9)
-
Step 600
600
#735DCC
oklch(55.6% 0.165 289)
-
Step 700
700
#614CB0
oklch(49.1% 0.153 289.2)
-
Step 800
800
#4F3F8F
oklch(42.7% 0.127 289.1)
-
Step 900
900 (this color)
#3B306B
oklch(35.4% 0.099 288.9)
-
Step 950
950
#262043
oklch(27% 0.064 289.3)
#3B306B 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) | #153A6D | 0.054 |
| Deuteranopia (no green cones) | #16386A | 0.052 |
| Tritanopia (no blue cones) | #2D3C48 | 0.082 |
| Achromatopsia (no color) | #393939 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B306B
#3B306B
oklch(35.4% 0.099 288.9)
- #3F3E00
#3F3E00
oklch(35.3% 0.076 108.7)
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 #3B306B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.060
- Marine Blue #01386A ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.066
- Twilight Blue #0A437A ΔE 0.070
- Marine #042E60 ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.079
- Dark Blue Grey #1F3B4D ΔE 0.079
- Dark Grey Blue #29465B ΔE 0.080
Use #3B306B 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.