#313555
Closest named color: Prussian Blue (#1D3557). oklch(34.1% 0.056 277.5), rgb(49, 53, 85).
Aa
White text reads best on this color (11.85:1).
About this color
#313555 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.056 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 11.85:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.77:1 |
| White text | 11.85:1 |
Values
| HEX | #313555 |
| RGB | rgb(49, 53, 85) |
| HSL | hsl(233, 27%, 26%) |
| OKLCH | oklch(34.1% 0.056 277.5) |
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 #313555 | 11.85:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #313555 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #313555 text on white | 11.85:1 | AAA | Lc 97.2 | Preferred for body text |
| #313555 text on black | 1.77:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D5D8E9
oklch(88.5% 0.023 277.9)
-
Step 300
300
#B9BFDC
oklch(80.9% 0.041 276.2)
-
Step 400
400
#969DCB
oklch(70.7% 0.068 277.8)
-
Step 500
500
#7D84BE
oklch(63.1% 0.088 278.3)
-
Step 600
600
#666DAA
oklch(55.5% 0.095 277.8)
-
Step 700
700
#555B92
oklch(49.1% 0.088 277.9)
-
Step 800
800
#454B76
oklch(42.7% 0.072 276.9)
-
Step 900
900 (this color)
#313555
oklch(34.1% 0.056 277.5)
-
Step 950
950
#222538
oklch(27.1% 0.036 276.8)
#313555 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) | #2A3956 | 0.015 |
| Deuteranopia (no green cones) | #283654 | 0.014 |
| Tritanopia (no blue cones) | #263B41 | 0.049 |
| Achromatopsia (no color) | #373737 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313555
#313555
oklch(34.1% 0.056 277.5)
- #403812
#403812
oklch(34% 0.056 97.4)
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 #313555, 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 0.036
- Gunmetal #293241 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.040
- Onyx #343A40 ΔE 0.045
- Midnight Green #073B4C ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.052
- Marine Blue #01386A ΔE 0.056
Use #313555 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.