#343578
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.112 278.7), rgb(52, 53, 120).
Aa
White text reads best on this color (10.90:1).
About this color
#343578 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.112 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.90:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #343578 |
| RGB | rgb(52, 53, 120) |
| HSL | hsl(239, 40%, 34%) |
| OKLCH | oklch(36.7% 0.112 278.7) |
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 #343578 | 10.90:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #343578 | 1.92:1 | Fails | Lc 8.9 | Not readable |
| #343578 text on white | 10.90:1 | AAA | Lc 95.0 | Preferred for body text |
| #343578 text on black | 1.92:1 | Fails | Lc -7.6 | 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
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D2D7F8
oklch(88.6% 0.046 278.6)
-
Step 300
300
#B4BCF7
oklch(81% 0.084 278.4)
-
Step 400
400
#8F96F3
oklch(70.6% 0.135 279.1)
-
Step 500
500
#757AEE
oklch(63.2% 0.171 278.5)
-
Step 600
600
#605FDC
oklch(55.5% 0.186 278.8)
-
Step 700
700
#504EBF
oklch(49.2% 0.172 278.8)
-
Step 800
800
#41409B
oklch(42.6% 0.144 278.8)
-
Step 900
900 (this color)
#343578
oklch(36.7% 0.112 278.7)
-
Step 950
950
#202148
oklch(27% 0.071 279.4)
#343578 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) | #0E407A | 0.046 |
| Deuteranopia (no green cones) | #013A77 | 0.048 |
| Tritanopia (no blue cones) | #144451 | 0.096 |
| Achromatopsia (no color) | #3D3D3D | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343578
#343578
oklch(36.7% 0.112 278.7)
- #493F00
#493F00
oklch(36.7% 0.076 99.1)
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 #343578, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.051
- Marine Blue #01386A ΔE 0.057
- Cobalt #1E488F ΔE 0.062
- Blueberry #464196 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.067
- Marine #042E60 ΔE 0.074
- Light Navy #155084 ΔE 0.078
Use #343578 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.