#313D67
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.074 270.4), rgb(49, 61, 103).
Aa
White text reads best on this color (10.53:1).
About this color
#313D67 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.074 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.040 away. White text reads best on it, at 10.53:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #313D67 |
| RGB | rgb(49, 61, 103) |
| HSL | hsl(227, 36%, 30%) |
| OKLCH | oklch(37.1% 0.074 270.4) |
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 #313D67 | 10.53:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #313D67 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #313D67 text on white | 10.53:1 | AAA | Lc 94.3 | Preferred for body text |
| #313D67 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3C0E5
oklch(81% 0.054 269.9)
-
Step 400
400
#8B9ED9
oklch(70.7% 0.089 270.3)
-
Step 500
500
#6F85CE
oklch(63.1% 0.113 270.2)
-
Step 600
600
#586DBB
oklch(55.5% 0.124 270.6)
-
Step 700
700
#485BA1
oklch(49% 0.114 270.3)
-
Step 800
800
#3B4B83
oklch(42.8% 0.095 270)
-
Step 900
900 (this color)
#313D67
oklch(37.1% 0.074 270.4)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#313D67 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) | #2D4169 | 0.012 |
| Deuteranopia (no green cones) | #273D66 | 0.014 |
| Tritanopia (no blue cones) | #1B464D | 0.066 |
| Achromatopsia (no color) | #3F3F3F | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D67
#313D67
oklch(37.1% 0.074 270.4)
- #4F3E03
#4F3E03
oklch(37.2% 0.074 90.7)
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 #313D67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.040
- Twilight Blue #0A437A ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.046
- Marine Blue #01386A ΔE 0.050
- Charcoal #264653 ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.053
- Midnight Green #073B4C ΔE 0.067
- Onyx #343A40 ΔE 0.067
Use #313D67 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.