#31365F
Closest named color: Prussian Blue (#1D3557). oklch(34.9% 0.071 276.8), rgb(49, 54, 95).
Aa
White text reads best on this color (11.51:1).
About this color
#31365F is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.071 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 11.51:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.51:1 |
Values
| HEX | #31365F |
| RGB | rgb(49, 54, 95) |
| HSL | hsl(233, 32%, 28%) |
| OKLCH | oklch(34.9% 0.071 276.8) |
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 #31365F | 11.51:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #31365F | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #31365F text on white | 11.51:1 | AAA | Lc 96.4 | Preferred for body text |
| #31365F 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8ED
oklch(88.6% 0.029 277.2)
-
Step 300
300
#B7BEE4
oklch(80.9% 0.054 276.9)
-
Step 400
400
#929CD6
oklch(70.7% 0.086 276.4)
-
Step 500
500
#7983CB
oklch(63.2% 0.109 276.8)
-
Step 600
600
#626BB8
oklch(55.6% 0.119 276.7)
-
Step 700
700
#51599E
oklch(49.1% 0.11 276.6)
-
Step 800
800
#434980
oklch(42.7% 0.091 277.1)
-
Step 900
900 (this color)
#31365F
oklch(34.9% 0.071 276.8)
-
Step 950
950
#21243C
oklch(27% 0.045 277.5)
#31365F 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) | #273B61 | 0.019 |
| Deuteranopia (no green cones) | #23375E | 0.020 |
| Tritanopia (no blue cones) | #213E46 | 0.062 |
| Achromatopsia (no color) | #393939 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31365F
#31365F
oklch(34.9% 0.071 276.8)
- #453A01
#453A01
oklch(35% 0.071 97)
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 #31365F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Dark Blue Grey #1F3B4D ΔE 0.047
- Marine Blue #01386A ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.053
- Gunmetal #293241 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.056
- Marine #042E60 ΔE 0.059
- Onyx #343A40 ΔE 0.060
Use #31365F 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.