#31345B
Closest named color: Prussian Blue (#1D3557). oklch(34.2% 0.068 278.8), rgb(49, 52, 91).
Aa
White text reads best on this color (11.84:1).
About this color
#31345B is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.068 and its hue 279°. 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 11.84:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.84:1 |
Values
| HEX | #31345B |
| RGB | rgb(49, 52, 91) |
| HSL | hsl(236, 30%, 27%) |
| OKLCH | oklch(34.2% 0.068 278.8) |
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 #31345B | 11.84:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #31345B | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #31345B text on white | 11.84:1 | AAA | Lc 97.1 | Preferred for body text |
| #31345B text on black | 1.77:1 | 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
#D4D8EC
oklch(88.5% 0.028 276.8)
-
Step 300
300
#B9BEE2
oklch(80.9% 0.051 279)
-
Step 400
400
#959CD3
oklch(70.8% 0.081 278.5)
-
Step 500
500
#7C82C8
oklch(63.1% 0.105 279.2)
-
Step 600
600
#656BB4
oklch(55.6% 0.113 278.5)
-
Step 700
700
#54599B
oklch(49.1% 0.105 278.5)
-
Step 800
800
#45497E
oklch(42.7% 0.087 278.7)
-
Step 900
900 (this color)
#31345B
oklch(34.2% 0.068 278.8)
-
Step 950
950
#22243B
oklch(27% 0.043 279.3)
#31345B 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) | #26395D | 0.020 |
| Deuteranopia (no green cones) | #23365A | 0.021 |
| Tritanopia (no blue cones) | #243C43 | 0.059 |
| Achromatopsia (no color) | #373737 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31345B
#31345B
oklch(34.2% 0.068 278.8)
- #413904
#413904
oklch(34.3% 0.068 100)
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 #31345B, 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 0.044
- Space Cadet #2B2D42 ΔE 0.048
- Gunmetal #293241 ΔE 0.049
- Marine Blue #01386A ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.057
- Onyx #343A40 ΔE 0.057
- Marine #042E60 ΔE 0.057
Use #31345B 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.