#31345A
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.066 278.8), rgb(49, 52, 90).
Aa
White text reads best on this color (11.86:1).
About this color
#31345A is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.066 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 11.86:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.86:1 |
Values
| HEX | #31345A |
| RGB | rgb(49, 52, 90) |
| HSL | hsl(236, 29%, 27%) |
| OKLCH | oklch(34.1% 0.066 278.8) |
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 #31345A | 11.86:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #31345A | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #31345A text on white | 11.86:1 | AAA | Lc 97.1 | Preferred for body text |
| #31345A 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
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D5D8EC
oklch(88.6% 0.028 279)
-
Step 300
300
#B9BEE1
oklch(80.9% 0.05 278.8)
-
Step 400
400
#959CD2
oklch(70.7% 0.079 278.4)
-
Step 500
500
#7C83C6
oklch(63.2% 0.101 278.5)
-
Step 600
600
#666BB3
oklch(55.6% 0.111 279.1)
-
Step 700
700
#55599A
oklch(49.1% 0.103 279.2)
-
Step 800
800
#45497D
oklch(42.7% 0.086 278.8)
-
Step 900
900 (this color)
#31345A
oklch(34.1% 0.066 278.8)
-
Step 950
950
#22243B
oklch(27% 0.043 279.3)
#31345A 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) | #27395B | 0.020 |
| Deuteranopia (no green cones) | #243659 | 0.019 |
| Tritanopia (no blue cones) | #243C42 | 0.059 |
| Achromatopsia (no color) | #373737 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31345A
#31345A
oklch(34.1% 0.066 278.8)
- #413806
#413806
oklch(34% 0.066 98.3)
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 #31345A, 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 0.043
- Space Cadet #2B2D42 ΔE 0.046
- Gunmetal #293241 ΔE 0.047
- Marine Blue #01386A ΔE 0.052
- Onyx #343A40 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Marine #042E60 ΔE 0.057
Use #31345A 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.