#31335D
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.073 279.7), rgb(49, 51, 93).
Aa
White text reads best on this color (11.91:1).
About this color
#31335D is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.073 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.031 away. White text reads best on it, at 11.91:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #31335D |
| RGB | rgb(49, 51, 93) |
| HSL | hsl(237, 31%, 28%) |
| OKLCH | oklch(34.1% 0.073 279.7) |
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 #31335D | 11.91:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #31335D | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #31335D text on white | 11.91:1 | AAA | Lc 97.2 | Preferred for body text |
| #31335D text on black | 1.76:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D5D7EE
oklch(88.5% 0.032 281.8)
-
Step 300
300
#B9BDE4
oklch(80.8% 0.055 280.5)
-
Step 400
400
#959BD7
oklch(70.7% 0.088 279.5)
-
Step 500
500
#7C81CC
oklch(63.1% 0.112 279.7)
-
Step 600
600
#6669B9
oklch(55.5% 0.123 280)
-
Step 700
700
#55589F
oklch(49.2% 0.112 279.6)
-
Step 800
800
#454881
oklch(42.7% 0.094 279.4)
-
Step 900
900 (this color)
#31335D
oklch(34.1% 0.073 279.7)
-
Step 950
950
#22243D
oklch(27.1% 0.046 279.3)
#31335D 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) | #23395F | 0.025 |
| Deuteranopia (no green cones) | #20355C | 0.024 |
| Tritanopia (no blue cones) | #233C43 | 0.065 |
| Achromatopsia (no color) | #373737 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31335D
#31335D
oklch(34.1% 0.073 279.7)
- #413800
#413800
oklch(34% 0.07 99.2)
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 #31335D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.049
- Marine Blue #01386A ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.050
- Gunmetal #293241 ΔE 0.053
- Marine #042E60 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.061
- Onyx #343A40 ΔE 0.062
Use #31335D 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.