#31316B
Closest named color: Prussian Blue (#1D3557). oklch(34.6% 0.098 280), rgb(49, 49, 107).
Aa
White text reads best on this color (11.78:1).
About this color
#31316B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.098 and its hue 280°. 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 11.78:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #31316B |
| RGB | rgb(49, 49, 107) |
| HSL | hsl(240, 37%, 31%) |
| OKLCH | oklch(34.6% 0.098 280) |
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 #31316B | 11.78:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #31316B | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #31316B text on white | 11.78:1 | AAA | Lc 96.8 | Preferred for body text |
| #31316B text on black | 1.78:1 | 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
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D3D7F5
oklch(88.5% 0.041 279.5)
-
Step 300
300
#B7BCF0
oklch(80.9% 0.073 280.3)
-
Step 400
400
#9298E9
oklch(70.7% 0.118 279.7)
-
Step 500
500
#797CE2
oklch(63.1% 0.151 279.9)
-
Step 600
600
#6363D0
oklch(55.6% 0.164 279.7)
-
Step 700
700
#5351B4
oklch(49.1% 0.153 280.1)
-
Step 800
800
#444392
oklch(42.8% 0.127 280.2)
-
Step 900
900 (this color)
#31316B
oklch(34.6% 0.098 280)
-
Step 950
950
#212244
oklch(27% 0.062 280.1)
#31316B 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) | #143A6D | 0.040 |
| Deuteranopia (no green cones) | #0D356A | 0.041 |
| Tritanopia (no blue cones) | #193E49 | 0.085 |
| Achromatopsia (no color) | #383838 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31316B
#31316B
oklch(34.6% 0.098 280)
- #433A00
#433A00
oklch(34.7% 0.072 99.5)
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 #31316B, 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 Blue #01386A ΔE 0.048
- Marine #042E60 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.074
- Midnight Blue #191970 ΔE 0.075
Use #31316B 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.