#312C66
Closest named color: Prussian Blue (#1D3557). oklch(33.2% 0.098 283.5), rgb(49, 44, 102).
Aa
White text reads best on this color (12.47:1).
About this color
#312C66 is a dark, moderately saturated purple. In OKLCH its lightness is 33%, its chroma 0.098 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.048 away. White text reads best on it, at 12.47:1.
| Hue family | Purples |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.68:1 |
| White text | 12.47:1 |
Values
| HEX | #312C66 |
| RGB | rgb(49, 44, 102) |
| HSL | hsl(245, 40%, 29%) |
| OKLCH | oklch(33.2% 0.098 283.5) |
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 #312C66 | 12.47:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #312C66 | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #312C66 text on white | 12.47:1 | AAA | Lc 98.2 | Preferred for body text |
| #312C66 text on black | 1.68:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E8F8
oklch(93.5% 0.022 283.1)
-
Step 200
200
#D5D6F4
oklch(88.5% 0.041 284)
-
Step 300
300
#BABBF0
oklch(81% 0.074 283.8)
-
Step 400
400
#9796E8
oklch(70.7% 0.119 283.5)
-
Step 500
500
#7F7AE1
oklch(63.1% 0.151 283.4)
-
Step 600
600
#6A61CE
oklch(55.7% 0.163 283.5)
-
Step 700
700
#594FB3
oklch(49.1% 0.153 283.7)
-
Step 800
800
#484191
oklch(42.6% 0.128 283.5)
-
Step 900
900 (this color)
#312C66
oklch(33.2% 0.098 283.5)
-
Step 950
950
#232144
oklch(27% 0.064 283.9)
#312C66 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) | #0D3668 | 0.047 |
| Deuteranopia (no green cones) | #093265 | 0.047 |
| Tritanopia (no blue cones) | #1E3944 | 0.084 |
| Achromatopsia (no color) | #343434 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #312C66
#312C66
oklch(33.2% 0.098 283.5)
- #3C3700
#3C3700
oklch(33.1% 0.07 103.9)
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 #312C66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.048
- Marine #042E60 ΔE 0.053
- Marine Blue #01386A ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.067
- Midnight Blue #191970 ΔE 0.067
- Dark Blue Grey #1F3B4D ΔE 0.074
- Twilight Blue #0A437A ΔE 0.074
- Gunmetal #293241 ΔE 0.074
Use #312C66 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.