#313A63
Closest named color: Prussian Blue (#1D3557). oklch(36.1% 0.072 272.9), rgb(49, 58, 99).
Aa
White text reads best on this color (10.96:1).
About this color
#313A63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.072 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.039 away. White text reads best on it, at 10.96:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #313A63 |
| RGB | rgb(49, 58, 99) |
| HSL | hsl(229, 34%, 29%) |
| OKLCH | oklch(36.1% 0.072 272.9) |
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 #313A63 | 10.96:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #313A63 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #313A63 text on white | 10.96:1 | AAA | Lc 95.3 | Preferred for body text |
| #313A63 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B5BFE4
oklch(80.9% 0.053 273.3)
-
Step 400
400
#8E9DD7
oklch(70.6% 0.087 272.8)
-
Step 500
500
#7384CC
oklch(63% 0.11 272.8)
-
Step 600
600
#5D6DB9
oklch(55.7% 0.119 273)
-
Step 700
700
#4C5A9F
oklch(49% 0.112 273)
-
Step 800
800
#3F4A81
oklch(42.7% 0.092 273.4)
-
Step 900
900 (this color)
#313A63
oklch(36.1% 0.072 272.9)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#313A63 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) | #2A3F65 | 0.016 |
| Deuteranopia (no green cones) | #263A62 | 0.015 |
| Tritanopia (no blue cones) | #1E4349 | 0.066 |
| Achromatopsia (no color) | #3C3C3C | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A63
#313A63
oklch(36.1% 0.072 272.9)
- #4A3C03
#4A3C03
oklch(36.1% 0.072 93.6)
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 #313A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.044
- Marine Blue #01386A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.048
- Twilight Blue #0A437A ΔE 0.052
- Charcoal #264653 ΔE 0.055
- Onyx #343A40 ΔE 0.062
- Midnight Green #073B4C ΔE 0.062
Use #313A63 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.