#313D80
Closest named color: Twilight Blue (#0A437A). oklch(38.8% 0.113 272.4), rgb(49, 61, 128).
Aa
White text reads best on this color (9.95:1).
About this color
#313D80 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.113 and its hue 272°. 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 9.95:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.95:1 |
Values
| HEX | #313D80 |
| RGB | rgb(49, 61, 128) |
| HSL | hsl(231, 45%, 35%) |
| OKLCH | oklch(38.8% 0.113 272.4) |
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 #313D80 | 9.95:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #313D80 | 2.10:1 | Fails | Lc 11.1 | Not readable |
| #313D80 text on white | 9.95:1 | AAA | Lc 92.9 | Preferred for body text |
| #313D80 text on black | 2.10:1 | Fails | Lc -9.6 | 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
#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
#849AF5
oklch(70.8% 0.136 272.2)
-
Step 500
500
#677DF1
oklch(63% 0.174 272.4)
-
Step 600
600
#5163DF
oklch(55.5% 0.188 272.5)
-
Step 700
700
#4251C2
oklch(49% 0.176 272.4)
-
Step 800
800
#36439D
oklch(42.6% 0.146 272.4)
-
Step 900
900 (this color)
#313D80
oklch(38.8% 0.113 272.4)
-
Step 950
950
#1B2249
oklch(26.9% 0.072 272.9)
#313D80 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) | #194682 | 0.032 |
| Deuteranopia (no green cones) | #073F7F | 0.037 |
| Tritanopia (no blue cones) | #004C58 | 0.098 |
| Achromatopsia (no color) | #434343 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D80
#313D80
oklch(38.8% 0.113 272.4)
- #534300
#534300
oklch(38.8% 0.08 93.4)
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 #313D80, 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 0.039
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.050
- Light Navy #155084 ΔE 0.056
- Marine Blue #01386A ΔE 0.062
- Dusk Blue #26538D ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.069
Use #313D80 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.