#343A6D
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.087 276.2), rgb(52, 58, 109).
Aa
White text reads best on this color (10.64:1).
About this color
#343A6D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.087 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.64:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #343A6D |
| RGB | rgb(52, 58, 109) |
| HSL | hsl(234, 35%, 32%) |
| OKLCH | oklch(37% 0.087 276.2) |
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 #343A6D | 10.64:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #343A6D | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #343A6D text on white | 10.64:1 | AAA | Lc 94.6 | Preferred for body text |
| #343A6D text on black | 1.97:1 | Fails | Lc -8.0 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B5BEEB
oklch(81% 0.064 276)
-
Step 400
400
#8F9BE2
oklch(70.8% 0.105 276)
-
Step 500
500
#7580D9
oklch(63.1% 0.134 276.5)
-
Step 600
600
#5E68C7
oklch(55.6% 0.146 276.1)
-
Step 700
700
#4E56AC
oklch(49.1% 0.136 276.2)
-
Step 800
800
#40478B
oklch(42.8% 0.111 276.2)
-
Step 900
900 (this color)
#343A6D
oklch(37% 0.087 276.2)
-
Step 950
950
#1F2341
oklch(26.9% 0.056 276.2)
#343A6D 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) | #25416F | 0.026 |
| Deuteranopia (no green cones) | #203C6C | 0.026 |
| Tritanopia (no blue cones) | #1D454E | 0.077 |
| Achromatopsia (no color) | #3E3E3E | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343A6D
#343A6D
oklch(37% 0.087 276.2)
- #4C3F00
#4C3F00
oklch(37% 0.076 95.8)
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 #343A6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Marine Blue #01386A ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
- Cobalt #1E488F ΔE 0.066
- Charcoal #264653 ΔE 0.068
Use #343A6D 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.