#343B6E
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.087 275.4), rgb(52, 59, 110).
Aa
White text reads best on this color (10.51:1).
About this color
#343B6E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.087 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #343B6E |
| RGB | rgb(52, 59, 110) |
| HSL | hsl(233, 36%, 32%) |
| OKLCH | oklch(37.3% 0.087 275.4) |
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 #343B6E | 10.51:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #343B6E | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #343B6E text on white | 10.51:1 | AAA | Lc 94.3 | Preferred for body text |
| #343B6E text on black | 1.99:1 | Fails | Lc -8.3 | 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
#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
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8E9BE2
oklch(70.7% 0.105 275.4)
-
Step 500
500
#7381D9
oklch(63.1% 0.133 275.1)
-
Step 600
600
#5D68C7
oklch(55.6% 0.146 275.6)
-
Step 700
700
#4D56AC
oklch(49.1% 0.136 275.7)
-
Step 800
800
#3F478B
oklch(42.7% 0.112 275.6)
-
Step 900
900 (this color)
#343B6E
oklch(37.3% 0.087 275.4)
-
Step 950
950
#1F2441
oklch(27.1% 0.054 274.8)
#343B6E 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) | #264270 | 0.025 |
| Deuteranopia (no green cones) | #203D6D | 0.026 |
| Tritanopia (no blue cones) | #1C464F | 0.077 |
| Achromatopsia (no color) | #3F3F3F | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B6E
#343B6E
oklch(37.3% 0.087 275.4)
- #4D4000
#4D4000
oklch(37.4% 0.077 96)
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 #343B6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Marine Blue #01386A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.059
- Cobalt #1E488F ΔE 0.064
- Dark Blue Grey #1F3B4D ΔE 0.067
- Charcoal #264653 ΔE 0.067
Use #343B6E 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.