#313B7C
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.11 273.5), rgb(49, 59, 124).
Aa
White text reads best on this color (10.25:1).
About this color
#313B7C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.110 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 10.25:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #313B7C |
| RGB | rgb(49, 59, 124) |
| HSL | hsl(232, 43%, 34%) |
| OKLCH | oklch(38.1% 0.11 273.5) |
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 #313B7C | 10.25:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #313B7C | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #313B7C text on white | 10.25:1 | AAA | Lc 93.6 | Preferred for body text |
| #313B7C text on black | 2.04:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F8
oklch(88.5% 0.045 273)
-
Step 300
300
#AFBDF7
oklch(80.8% 0.084 273.9)
-
Step 400
400
#8699F2
oklch(70.6% 0.132 273.4)
-
Step 500
500
#6B7DEE
oklch(63.1% 0.169 273.7)
-
Step 600
600
#5464DC
oklch(55.7% 0.182 273.2)
-
Step 700
700
#4552BF
oklch(49.2% 0.17 273.3)
-
Step 800
800
#39449B
oklch(42.9% 0.141 273.5)
-
Step 900
900 (this color)
#313B7C
oklch(38.1% 0.11 273.5)
-
Step 950
950
#1C2248
oklch(26.9% 0.07 274)
#313B7C 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) | #18447E | 0.033 |
| Deuteranopia (no green cones) | #0A3E7B | 0.036 |
| Tritanopia (no blue cones) | #004A55 | 0.098 |
| Achromatopsia (no color) | #414141 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B7C
#313B7C
oklch(38.1% 0.11 273.5)
- #514100
#514100
oklch(38.1% 0.078 93)
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 #313B7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Blueberry #464196 ΔE 0.057
- Marine Blue #01386A ΔE 0.057
- Light Navy #155084 ΔE 0.061
- Dusk Blue #26538D ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.072
Use #313B7C 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.