#313D6B
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.08 271), rgb(49, 61, 107).
Aa
White text reads best on this color (10.44:1).
About this color
#313D6B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.080 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.44:1 |
Values
| HEX | #313D6B |
| RGB | rgb(49, 61, 107) |
| HSL | hsl(228, 37%, 31%) |
| OKLCH | oklch(37.3% 0.08 271) |
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 #313D6B | 10.44:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #313D6B | 2.01:1 | Fails | Lc 9.8 | Not readable |
| #313D6B text on white | 10.44:1 | AAA | Lc 94.1 | Preferred for body text |
| #313D6B text on black | 2.01:1 | Fails | Lc -8.4 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B2BFE9
oklch(80.9% 0.061 271.5)
-
Step 400
400
#8A9DDD
oklch(70.6% 0.097 271.1)
-
Step 500
500
#6E84D4
oklch(63.1% 0.123 270.9)
-
Step 600
600
#576CC1
oklch(55.6% 0.134 271)
-
Step 700
700
#475AA7
oklch(49.1% 0.125 270.8)
-
Step 800
800
#3B4A87
oklch(42.8% 0.103 271.1)
-
Step 900
900 (this color)
#313D6B
oklch(37.3% 0.08 271)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#313D6B 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) | #2B426D | 0.016 |
| Deuteranopia (no green cones) | #243D6A | 0.017 |
| Tritanopia (no blue cones) | #17474E | 0.073 |
| Achromatopsia (no color) | #404040 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D6B
#313D6B
oklch(37.3% 0.08 271)
- #503E00
#503E00
oklch(37.3% 0.076 90.1)
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 #313D6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.045
- Marine Blue #01386A ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.050
- Charcoal #264653 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.059
- Light Navy #155084 ΔE 0.065
- Cobalt #1E488F ΔE 0.065
Use #313D6B 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.