#343580
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.124 278), rgb(52, 53, 128).
Aa
White text reads best on this color (10.67:1).
About this color
#343580 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.124 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.044 away. White text reads best on it, at 10.67:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.96:1 |
| White text | 10.67:1 |
Values
| HEX | #343580 |
| RGB | rgb(52, 53, 128) |
| HSL | hsl(239, 42%, 35%) |
| OKLCH | oklch(37.4% 0.124 278) |
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 #343580 | 10.67:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #343580 | 1.96:1 | Fails | Lc 9.5 | Not readable |
| #343580 text on white | 10.67:1 | AAA | Lc 94.4 | Preferred for body text |
| #343580 text on black | 1.96:1 | Fails | Lc -8.1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D1D7FC
oklch(88.6% 0.051 278)
-
Step 300
300
#B2BBFC
oklch(80.8% 0.092 278)
-
Step 400
400
#8C95FB
oklch(70.7% 0.148 278.1)
-
Step 500
500
#7277F9
oklch(63.1% 0.19 277.8)
-
Step 600
600
#5D5BE8
oklch(55.6% 0.207 277.9)
-
Step 700
700
#4E4AC9
oklch(49.1% 0.191 278.1)
-
Step 800
800
#3F3EA3
oklch(42.8% 0.159 277.8)
-
Step 900
900 (this color)
#343580
oklch(37.4% 0.124 278)
-
Step 950
950
#1F204C
oklch(27% 0.08 278.7)
#343580 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) | #004183 | 0.050 |
| Deuteranopia (no green cones) | #003B7E | 0.048 |
| Tritanopia (no blue cones) | #064755 | 0.108 |
| Achromatopsia (no color) | #3E3E3E | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343580
#343580
oklch(37.4% 0.124 278)
- #4C4000
#4C4000
oklch(37.3% 0.077 97.1)
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 #343580, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.044
- Twilight Blue #0A437A ΔE 0.053
- Cobalt #1E488F ΔE 0.056
- Blueberry #464196 ΔE 0.057
- Marine Blue #01386A ΔE 0.064
- Sapphire #2138AB ΔE 0.074
- Light Navy #155084 ΔE 0.076
- Prussian Blue #1D3557 ΔE 0.079
Use #343580 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.