#313873
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.1 275.2), rgb(49, 56, 115).
Aa
White text reads best on this color (10.80:1).
About this color
#313873 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.100 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #313873 |
| RGB | rgb(49, 56, 115) |
| HSL | hsl(234, 40%, 32%) |
| OKLCH | oklch(36.7% 0.1 275.2) |
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 #313873 | 10.80:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #313873 | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #313873 text on white | 10.80:1 | AAA | Lc 94.8 | Preferred for body text |
| #313873 text on black | 1.94:1 | Fails | Lc -7.8 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D1D8F5
oklch(88.6% 0.041 274.8)
-
Step 300
300
#B2BDF2
oklch(80.8% 0.076 275.5)
-
Step 400
400
#8B9AEB
oklch(70.7% 0.12 274.9)
-
Step 500
500
#707EE5
oklch(63% 0.154 275.2)
-
Step 600
600
#5A65D3
oklch(55.6% 0.167 275.3)
-
Step 700
700
#4A53B7
oklch(49.1% 0.156 275.2)
-
Step 800
800
#3D4594
oklch(42.8% 0.128 275.2)
-
Step 900
900 (this color)
#313873
oklch(36.7% 0.1 275.2)
-
Step 950
950
#1E2345
oklch(27.1% 0.063 275.1)
#313873 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) | #1B4075 | 0.031 |
| Deuteranopia (no green cones) | #123B72 | 0.034 |
| Tritanopia (no blue cones) | #0F4550 | 0.088 |
| Achromatopsia (no color) | #3D3D3D | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313873
#313873
oklch(36.7% 0.1 275.2)
- #4B3E00
#4B3E00
oklch(36.7% 0.075 95.6)
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 #313873, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.058
- Cobalt #1E488F ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.067
- Marine #042E60 ΔE 0.069
- Blueberry #464196 ΔE 0.071
Use #313873 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.