#313E70
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.087 270.8), rgb(49, 62, 112).
Aa
White text reads best on this color (10.22:1).
About this color
#313E70 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.087 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.22:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #313E70 |
| RGB | rgb(49, 62, 112) |
| HSL | hsl(228, 39%, 32%) |
| OKLCH | oklch(37.9% 0.087 270.8) |
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 #313E70 | 10.22:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #313E70 | 2.05:1 | Fails | Lc 10.3 | Not readable |
| #313E70 text on white | 10.22:1 | AAA | Lc 93.6 | Preferred for body text |
| #313E70 text on black | 2.05:1 | Fails | Lc -8.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B1BFEC
oklch(80.9% 0.066 271.4)
-
Step 400
400
#889DE2
oklch(70.7% 0.104 270.6)
-
Step 500
500
#6C83DA
oklch(63.1% 0.134 271)
-
Step 600
600
#546BC7
oklch(55.6% 0.145 270.5)
-
Step 700
700
#4559AC
oklch(49.1% 0.134 270.6)
-
Step 800
800
#39498B
oklch(42.7% 0.111 270.8)
-
Step 900
900 (this color)
#313E70
oklch(37.9% 0.087 270.8)
-
Step 950
950
#1C2441
oklch(26.9% 0.055 270.7)
#313E70 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) | #294472 | 0.019 |
| Deuteranopia (no green cones) | #223E6F | 0.019 |
| Tritanopia (no blue cones) | #124951 | 0.078 |
| Achromatopsia (no color) | #414141 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E70
#313E70
oklch(37.9% 0.087 270.8)
- #524000
#524000
oklch(38% 0.078 90.6)
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 #313E70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.050
- Marine Blue #01386A ΔE 0.052
- Cobalt #1E488F ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
- Charcoal #264653 ΔE 0.064
Use #313E70 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.