#313559
Closest named color: Prussian Blue (#1D3557). oklch(34.3% 0.063 277.7), rgb(49, 53, 89).
Aa
White text reads best on this color (11.77:1).
About this color
#313559 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.063 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 11.77:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.78:1 |
| White text | 11.77:1 |
Values
| HEX | #313559 |
| RGB | rgb(49, 53, 89) |
| HSL | hsl(234, 29%, 27%) |
| OKLCH | oklch(34.3% 0.063 277.7) |
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 #313559 | 11.77:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #313559 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #313559 text on white | 11.77:1 | AAA | Lc 97.0 | Preferred for body text |
| #313559 text on black | 1.78:1 | 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B9BEE0
oklch(80.9% 0.048 278.7)
-
Step 400
400
#959CD0
oklch(70.6% 0.076 278.3)
-
Step 500
500
#7B83C4
oklch(63% 0.098 277.8)
-
Step 600
600
#656CB0
oklch(55.6% 0.105 277.9)
-
Step 700
700
#545A97
oklch(49.1% 0.097 277.9)
-
Step 800
800
#454A7B
oklch(42.8% 0.081 278)
-
Step 900
900 (this color)
#313559
oklch(34.3% 0.063 277.7)
-
Step 950
950
#22243A
oklch(26.9% 0.041 279.3)
#313559 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) | #28395A | 0.017 |
| Deuteranopia (no green cones) | #263658 | 0.016 |
| Tritanopia (no blue cones) | #243C42 | 0.056 |
| Achromatopsia (no color) | #383838 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313559
#313559
oklch(34.3% 0.063 277.7)
- #42390B
#42390B
oklch(34.4% 0.063 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 #313559, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.040
- Gunmetal #293241 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.046
- Onyx #343A40 ΔE 0.052
- Marine Blue #01386A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
- Midnight Green #073B4C ΔE 0.055
Use #313559 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.