#31316F
Closest named color: Marine Blue (#01386A). oklch(35% 0.105 279.5), rgb(49, 49, 111).
Aa
White text reads best on this color (11.67:1).
About this color
#31316F is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.105 and its hue 280°. 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 11.67:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.67:1 |
Values
| HEX | #31316F |
| RGB | rgb(49, 49, 111) |
| HSL | hsl(240, 39%, 31%) |
| OKLCH | oklch(35% 0.105 279.5) |
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 #31316F | 11.67:1 | AAA | Lc -100.3 | Preferred for body text |
| Black text on #31316F | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #31316F text on white | 11.67:1 | AAA | Lc 96.6 | Preferred for body text |
| #31316F text on black | 1.79:1 | 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F6
oklch(88.6% 0.043 279.7)
-
Step 300
300
#B6BCF3
oklch(81% 0.078 279.7)
-
Step 400
400
#9197ED
oklch(70.7% 0.125 279.6)
-
Step 500
500
#787BE8
oklch(63.2% 0.161 279.6)
-
Step 600
600
#6261D6
oklch(55.6% 0.175 279.4)
-
Step 700
700
#524FB9
oklch(49% 0.162 279.8)
-
Step 800
800
#434296
oklch(42.8% 0.134 279.6)
-
Step 900
900 (this color)
#31316F
oklch(35% 0.105 279.5)
-
Step 950
950
#202246
oklch(27.1% 0.066 278.6)
#31316F 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) | #0E3B71 | 0.043 |
| Deuteranopia (no green cones) | #05366E | 0.045 |
| Tritanopia (no blue cones) | #163F4B | 0.090 |
| Achromatopsia (no color) | #383838 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31316F
#31316F
oklch(35% 0.105 279.5)
- #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 #31316F, 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 0.054
- Twilight Blue #0A437A ΔE 0.059
- Marine #042E60 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.069
- Midnight Blue #191970 ΔE 0.074
- Dark Blue Grey #1F3B4D ΔE 0.077
- Cobalt #1E488F ΔE 0.078
Use #31316F 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.