#313A7A
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.108 274), rgb(49, 58, 122).
Aa
White text reads best on this color (10.41:1).
About this color
#313A7A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.040 away. White text reads best on it, at 10.41:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.41:1 |
Values
| HEX | #313A7A |
| RGB | rgb(49, 58, 122) |
| HSL | hsl(233, 43%, 34%) |
| OKLCH | oklch(37.7% 0.108 274) |
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 #313A7A | 10.41:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #313A7A | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #313A7A text on white | 10.41:1 | AAA | Lc 93.9 | Preferred for body text |
| #313A7A text on black | 2.01:1 | Fails | Lc -8.6 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#CFD8F8
oklch(88.5% 0.045 273)
-
Step 300
300
#B0BDF6
oklch(80.8% 0.082 274.5)
-
Step 400
400
#8899F1
oklch(70.6% 0.13 274.3)
-
Step 500
500
#6C7DEC
oklch(63% 0.166 274.1)
-
Step 600
600
#5664DB
oklch(55.7% 0.181 273.9)
-
Step 700
700
#4752BE
oklch(49.2% 0.168 274.1)
-
Step 800
800
#3A4499
oklch(42.8% 0.138 274)
-
Step 900
900 (this color)
#313A7A
oklch(37.7% 0.108 274)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#313A7A 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) | #18437C | 0.034 |
| Deuteranopia (no green cones) | #0B3D79 | 0.037 |
| Tritanopia (no blue cones) | #024854 | 0.095 |
| Achromatopsia (no color) | #404040 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313A7A
#313A7A
oklch(37.7% 0.108 274)
- #4F4000
#4F4000
oklch(37.6% 0.077 93.9)
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 #313A7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Marine Blue #01386A ΔE 0.055
- Blueberry #464196 ΔE 0.060
- Light Navy #155084 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.072
Use #313A7A 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.