#31275B
Closest named color: Prussian Blue (#1D3557). oklch(31.4% 0.09 289), rgb(49, 39, 91).
Aa
White text reads best on this color (13.35:1).
About this color
#31275B is a dark, moderately saturated purple. In OKLCH its lightness is 31%, its chroma 0.090 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.050 away. White text reads best on it, at 13.35:1.
| Hue family | Purples |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.57:1 |
| White text | 13.35:1 |
Values
| HEX | #31275B |
| RGB | rgb(49, 39, 91) |
| HSL | hsl(252, 40%, 25%) |
| OKLCH | oklch(31.4% 0.09 289) |
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 #31275B | 13.35:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #31275B | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #31275B text on white | 13.35:1 | AAA | Lc 99.6 | Preferred for body text |
| #31275B text on black | 1.57:1 | 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 950.
-
Step 50
50
#F5F4FF
oklch(97.1% 0.015 290.3)
-
Step 100
100
#E9E7FE
oklch(93.6% 0.031 289.8)
-
Step 200
200
#D7D3FE
oklch(88.4% 0.059 289.4)
-
Step 300
300
#BEB6FF
oklch(80.9% 0.102 288.9)
-
Step 400
400
#9F8CFF
oklch(70.7% 0.164 289.1)
-
Step 500
500
#8A69FF
oklch(63.1% 0.213 288.9)
-
Step 600
600
#7748F1
oklch(55.6% 0.237 289.1)
-
Step 700
700
#6537D1
oklch(49.1% 0.219 289.4)
-
Step 800
800
#5230A9
oklch(42.7% 0.181 289.3)
-
Step 900
900
#432D86
oklch(37.8% 0.141 289.2)
-
Step 950
950 (this color)
#31275B
oklch(31.4% 0.09 289)
#31275B 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) | #0F305D | 0.049 |
| Deuteranopia (no green cones) | #0F2E5A | 0.048 |
| Tritanopia (no blue cones) | #25323D | 0.073 |
| Achromatopsia (no color) | #2F2F2F | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31275B
#31275B
oklch(31.4% 0.09 289)
- #343400
#343400
oklch(31.5% 0.069 109.8)
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 #31275B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.053
- Marine #042E60 ΔE 0.055
- Gunmetal #293241 ΔE 0.065
- Marine Blue #01386A ΔE 0.066
- Midnight Blue #191970 ΔE 0.068
- Oxford Blue #1B263B ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.074
Use #31275B 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.