#313C64
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.071 270.9), rgb(49, 60, 100).
Aa
White text reads best on this color (10.70:1).
About this color
#313C64 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.071 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.039 away. White text reads best on it, at 10.70:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #313C64 |
| RGB | rgb(49, 60, 100) |
| HSL | hsl(227, 34%, 29%) |
| OKLCH | oklch(36.6% 0.071 270.9) |
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 #313C64 | 10.70:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #313C64 | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #313C64 text on white | 10.70:1 | AAA | Lc 94.7 | Preferred for body text |
| #313C64 text on black | 1.96:1 | Fails | Lc -7.9 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B4BFE4
oklch(80.8% 0.054 272.1)
-
Step 400
400
#8D9ED6
oklch(70.7% 0.085 271.1)
-
Step 500
500
#7185CB
oklch(63.1% 0.108 270.9)
-
Step 600
600
#5A6EB8
oklch(55.7% 0.117 270.8)
-
Step 700
700
#4A5B9E
oklch(49% 0.109 271.2)
-
Step 800
800
#3D4B80
oklch(42.7% 0.09 271)
-
Step 900
900 (this color)
#313C64
oklch(36.6% 0.071 270.9)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#313C64 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) | #2D4066 | 0.012 |
| Deuteranopia (no green cones) | #283C63 | 0.013 |
| Tritanopia (no blue cones) | #1D444B | 0.062 |
| Achromatopsia (no color) | #3E3E3E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C64
#313C64
oklch(36.6% 0.071 270.9)
- #4D3D07
#4D3D07
oklch(36.7% 0.071 90.8)
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 #313C64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.049
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.049
- Charcoal #264653 ΔE 0.051
- Onyx #343A40 ΔE 0.062
- Midnight Green #073B4C ΔE 0.063
Use #313C64 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.