#313D70
Closest named color: Twilight Blue (#0A437A). oklch(37.6% 0.088 271.6), rgb(49, 61, 112).
Aa
White text reads best on this color (10.33:1).
About this color
#313D70 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.088 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.038 away. White text reads best on it, at 10.33:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.33:1 |
Values
| HEX | #313D70 |
| RGB | rgb(49, 61, 112) |
| HSL | hsl(229, 39%, 32%) |
| OKLCH | oklch(37.6% 0.088 271.6) |
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 #313D70 | 10.33:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #313D70 | 2.03:1 | Fails | Lc 10.1 | Not readable |
| #313D70 text on white | 10.33:1 | AAA | Lc 93.8 | Preferred for body text |
| #313D70 text on black | 2.03:1 | Fails | Lc -8.7 | 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
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B1BFEC
oklch(80.9% 0.066 271.4)
-
Step 400
400
#899CE3
oklch(70.6% 0.106 272)
-
Step 500
500
#6D82DB
oklch(63% 0.136 272)
-
Step 600
600
#566AC9
oklch(55.6% 0.148 271.9)
-
Step 700
700
#4658AD
oklch(49.1% 0.136 271.5)
-
Step 800
800
#3A488C
oklch(42.6% 0.113 272)
-
Step 900
900 (this color)
#313D70
oklch(37.6% 0.088 271.6)
-
Step 950
950
#1D2442
oklch(27% 0.057 272.2)
#313D70 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) | #274372 | 0.020 |
| Deuteranopia (no green cones) | #203E6F | 0.021 |
| Tritanopia (no blue cones) | #124851 | 0.078 |
| Achromatopsia (no color) | #404040 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D70
#313D70
oklch(37.6% 0.088 271.6)
- #503F00
#503F00
oklch(37.5% 0.077 91.5)
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 #313D70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Marine Blue #01386A ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.056
- Cobalt #1E488F ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Light Navy #155084 ΔE 0.061
- Charcoal #264653 ΔE 0.066
Use #313D70 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.