#313C7F
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.113 272.9), rgb(49, 60, 127).
Aa
White text reads best on this color (10.07:1).
About this color
#313C7F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.113 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 10.07:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #313C7F |
| RGB | rgb(49, 60, 127) |
| HSL | hsl(232, 44%, 35%) |
| OKLCH | oklch(38.5% 0.113 272.9) |
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 #313C7F | 10.07:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #313C7F | 2.08:1 | Fails | Lc 10.8 | Not readable |
| #313C7F text on white | 10.07:1 | AAA | Lc 93.2 | Preferred for body text |
| #313C7F text on black | 2.08:1 | Fails | Lc -9.3 | 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
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8F9
oklch(88.5% 0.047 272.1)
-
Step 300
300
#AEBEF8
oklch(81% 0.084 272.5)
-
Step 400
400
#8599F5
oklch(70.6% 0.136 273.2)
-
Step 500
500
#697DF1
oklch(63.1% 0.174 273.1)
-
Step 600
600
#5263DF
oklch(55.6% 0.188 272.8)
-
Step 700
700
#4351C2
oklch(49.1% 0.176 272.8)
-
Step 800
800
#37439D
oklch(42.7% 0.146 272.9)
-
Step 900
900 (this color)
#313C7F
oklch(38.5% 0.113 272.9)
-
Step 950
950
#1B2249
oklch(26.9% 0.072 272.9)
#313C7F 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) | #174581 | 0.033 |
| Deuteranopia (no green cones) | #063F7E | 0.037 |
| Tritanopia (no blue cones) | #004B57 | 0.099 |
| Achromatopsia (no color) | #424242 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313C7F
#313C7F
oklch(38.5% 0.113 272.9)
- #524200
#524200
oklch(38.5% 0.079 93.2)
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 #313C7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.042
- Blueberry #464196 ΔE 0.052
- Light Navy #155084 ΔE 0.058
- Marine Blue #01386A ΔE 0.061
- Dusk Blue #26538D ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.072
Use #313C7F 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.