#313C65
Closest named color: Dark Grey Blue (#29465B). oklch(36.7% 0.072 271.1), rgb(49, 60, 101).
Aa
White text reads best on this color (10.68:1).
About this color
#313C65 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.072 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.041 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #313C65 |
| RGB | rgb(49, 60, 101) |
| HSL | hsl(227, 35%, 29%) |
| OKLCH | oklch(36.7% 0.072 271.1) |
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 #313C65 | 10.68:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #313C65 | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #313C65 text on white | 10.68:1 | AAA | Lc 94.7 | Preferred for body text |
| #313C65 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
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D2D9EE
oklch(88.6% 0.03 271.1)
-
Step 300
300
#B3BFE5
oklch(80.8% 0.055 271.4)
-
Step 400
400
#8D9ED7
oklch(70.8% 0.086 271.3)
-
Step 500
500
#7185CD
oklch(63.2% 0.111 271.1)
-
Step 600
600
#5A6DB9
oklch(55.5% 0.12 271.4)
-
Step 700
700
#4A5BA0
oklch(49.1% 0.112 271.3)
-
Step 800
800
#3D4B82
oklch(42.8% 0.093 271.3)
-
Step 900
900 (this color)
#313C65
oklch(36.7% 0.072 271.1)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#313C65 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) | #2C4067 | 0.013 |
| Deuteranopia (no green cones) | #273C64 | 0.014 |
| Tritanopia (no blue cones) | #1C454B | 0.066 |
| Achromatopsia (no color) | #3E3E3E | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C65
#313C65
oklch(36.7% 0.072 271.1)
- #4D3D04
#4D3D04
oklch(36.7% 0.072 91.4)
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 #313C65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Marine Blue #01386A ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Onyx #343A40 ΔE 0.064
- Midnight Green #073B4C ΔE 0.064
Use #313C65 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.