#313571
Closest named color: Marine Blue (#01386A). oklch(36% 0.102 277.1), rgb(49, 53, 113).
Aa
White text reads best on this color (11.18:1).
About this color
#313571 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.102 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.048 away. White text reads best on it, at 11.18:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.87:1 |
| White text | 11.18:1 |
Values
| HEX | #313571 |
| RGB | rgb(49, 53, 113) |
| HSL | hsl(236, 40%, 32%) |
| OKLCH | oklch(36% 0.102 277.1) |
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 #313571 | 11.18:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #313571 | 1.87:1 | Fails | Lc 8.3 | Not readable |
| #313571 text on white | 11.18:1 | AAA | Lc 95.6 | Preferred for body text |
| #313571 text on black | 1.87:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F6
oklch(88.5% 0.043 278.2)
-
Step 300
300
#B4BDF2
oklch(81% 0.076 277.1)
-
Step 400
400
#8E99EC
oklch(70.8% 0.122 277.1)
-
Step 500
500
#747DE6
oklch(63.2% 0.156 277.3)
-
Step 600
600
#5E64D4
oklch(55.7% 0.169 277.1)
-
Step 700
700
#4E52B8
oklch(49.2% 0.158 277.2)
-
Step 800
800
#3F4494
oklch(42.7% 0.129 276.7)
-
Step 900
900 (this color)
#313571
oklch(36% 0.102 277.1)
-
Step 950
950
#1F2245
oklch(26.9% 0.064 277.4)
#313571 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) | #173E73 | 0.036 |
| Deuteranopia (no green cones) | #0E3970 | 0.038 |
| Tritanopia (no blue cones) | #13424D | 0.089 |
| Achromatopsia (no color) | #3B3B3B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313571
#313571
oklch(36% 0.102 277.1)
- #483D00
#483D00
oklch(36.1% 0.074 97.7)
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 #313571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.048
- Twilight Blue #0A437A ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.062
- Marine #042E60 ΔE 0.064
- Cobalt #1E488F ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.075
Use #313571 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.