#31365B
Closest named color: Prussian Blue (#1D3557). oklch(34.7% 0.065 276.6), rgb(49, 54, 91).
Aa
White text reads best on this color (11.60:1).
About this color
#31365B is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.065 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.029 away. White text reads best on it, at 11.60:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.60:1 |
Values
| HEX | #31365B |
| RGB | rgb(49, 54, 91) |
| HSL | hsl(233, 30%, 27%) |
| OKLCH | oklch(34.7% 0.065 276.6) |
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 #31365B | 11.60:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #31365B | 1.80:1 | Fails | Lc 0.0 | Not readable |
| #31365B text on white | 11.60:1 | AAA | Lc 96.6 | Preferred for body text |
| #31365B text on black | 1.80:1 | 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
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B8BEE1
oklch(80.8% 0.05 277.6)
-
Step 400
400
#949DD1
oklch(70.8% 0.077 276.6)
-
Step 500
500
#7A84C5
oklch(63.2% 0.098 276.5)
-
Step 600
600
#636CB2
oklch(55.5% 0.109 276.7)
-
Step 700
700
#525A99
oklch(49% 0.101 276.5)
-
Step 800
800
#434A7C
oklch(42.7% 0.083 276.2)
-
Step 900
900 (this color)
#31365B
oklch(34.7% 0.065 276.6)
-
Step 950
950
#21243A
oklch(26.8% 0.041 277.3)
#31365B 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) | #293A5C | 0.016 |
| Deuteranopia (no green cones) | #26375A | 0.016 |
| Tritanopia (no blue cones) | #233D44 | 0.056 |
| Achromatopsia (no color) | #393939 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31365B
#31365B
oklch(34.7% 0.065 276.6)
- #433909
#433909
oklch(34.5% 0.065 96.7)
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 #31365B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.041
- Gunmetal #293241 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.050
- Marine Blue #01386A ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.051
- Onyx #343A40 ΔE 0.054
- Midnight Green #073B4C ΔE 0.056
Use #31365B 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.