#313A61
Closest named color: Prussian Blue (#1D3557). oklch(36% 0.069 272.7), rgb(49, 58, 97).
Aa
White text reads best on this color (11.00:1).
About this color
#313A61 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.069 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.037 away. White text reads best on it, at 11.00:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #313A61 |
| RGB | rgb(49, 58, 97) |
| HSL | hsl(229, 33%, 29%) |
| OKLCH | oklch(36% 0.069 272.7) |
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 #313A61 | 11.00:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #313A61 | 1.90:1 | Fails | Lc 8.5 | Not readable |
| #313A61 text on white | 11.00:1 | AAA | Lc 95.4 | Preferred for body text |
| #313A61 text on black | 1.90:1 | 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
#E6E9F4
oklch(93.5% 0.015 273.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B5BFE3
oklch(80.9% 0.052 273)
-
Step 400
400
#8F9ED5
oklch(70.8% 0.082 272.4)
-
Step 500
500
#7485C9
oklch(63.2% 0.105 272.4)
-
Step 600
600
#5D6DB6
oklch(55.5% 0.115 272.8)
-
Step 700
700
#4D5B9D
oklch(49.1% 0.107 272.9)
-
Step 800
800
#3F4B7F
oklch(42.8% 0.088 272.4)
-
Step 900
900 (this color)
#313A61
oklch(36% 0.069 272.7)
-
Step 950
950
#1F253C
oklch(27% 0.044 272.1)
#313A61 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) | #2C3E63 | 0.013 |
| Deuteranopia (no green cones) | #273A60 | 0.014 |
| Tritanopia (no blue cones) | #1F4249 | 0.060 |
| Achromatopsia (no color) | #3C3C3C | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A61
#313A61
oklch(36% 0.069 272.7)
- #4A3C08
#4A3C08
oklch(36.1% 0.069 92.7)
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 #313A61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.045
- Marine Blue #01386A ΔE 0.049
- Charcoal #264653 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.054
- Onyx #343A40 ΔE 0.059
- Gunmetal #293241 ΔE 0.060
Use #313A61 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.