#313170
Closest named color: Marine Blue (#01386A). oklch(35% 0.106 279.4), rgb(49, 49, 112).
Aa
White text reads best on this color (11.64:1).
About this color
#313170 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.106 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.050 away. White text reads best on it, at 11.64:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.64:1 |
Values
| HEX | #313170 |
| RGB | rgb(49, 49, 112) |
| HSL | hsl(240, 39%, 32%) |
| OKLCH | oklch(35% 0.106 279.4) |
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 #313170 | 11.64:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #313170 | 1.80:1 | Fails | Lc 7.3 | Not readable |
| #313170 text on white | 11.64:1 | AAA | Lc 96.5 | Preferred for body text |
| #313170 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F7
oklch(88.5% 0.044 278.4)
-
Step 300
300
#B5BCF4
oklch(80.9% 0.079 278.9)
-
Step 400
400
#9197EE
oklch(70.7% 0.127 279.6)
-
Step 500
500
#777AE9
oklch(63% 0.164 279.4)
-
Step 600
600
#6261D7
oklch(55.7% 0.176 279.4)
-
Step 700
700
#514FBA
oklch(49% 0.164 279.3)
-
Step 800
800
#424197
oklch(42.6% 0.137 279.4)
-
Step 900
900 (this color)
#313170
oklch(35% 0.106 279.4)
-
Step 950
950
#202246
oklch(27.1% 0.066 278.6)
#313170 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) | #0C3B72 | 0.044 |
| Deuteranopia (no green cones) | #03366F | 0.046 |
| Tritanopia (no blue cones) | #143F4B | 0.092 |
| Achromatopsia (no color) | #383838 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313170
#313170
oklch(35% 0.106 279.4)
- #443B00
#443B00
oklch(35.1% 0.073 99.7)
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 #313170, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.058
- Marine #042E60 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.068
- Midnight Blue #191970 ΔE 0.074
- Cobalt #1E488F ΔE 0.077
- Dark Blue Grey #1F3B4D ΔE 0.078
Use #313170 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.