#343C6B
Closest named color: Twilight Blue (#0A437A). oklch(37.3% 0.081 274.5), rgb(52, 60, 107).
Aa
White text reads best on this color (10.47:1).
About this color
#343C6B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.081 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 10.47:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.47:1 |
Values
| HEX | #343C6B |
| RGB | rgb(52, 60, 107) |
| HSL | hsl(231, 35%, 31%) |
| OKLCH | oklch(37.3% 0.081 274.5) |
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 #343C6B | 10.47:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #343C6B | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #343C6B text on white | 10.47:1 | AAA | Lc 94.2 | Preferred for body text |
| #343C6B text on black | 2.00:1 | Fails | Lc -8.4 | 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
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B4BEE9
oklch(80.8% 0.062 274.7)
-
Step 400
400
#8E9CDD
oklch(70.7% 0.097 274.3)
-
Step 500
500
#7382D4
oklch(63.1% 0.124 274.4)
-
Step 600
600
#5D6AC1
oklch(55.6% 0.135 274.8)
-
Step 700
700
#4C58A7
oklch(49.1% 0.126 274.3)
-
Step 800
800
#3F4887
oklch(42.6% 0.104 275)
-
Step 900
900 (this color)
#343C6B
oklch(37.3% 0.081 274.5)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#343C6B 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) | #2A426D | 0.020 |
| Deuteranopia (no green cones) | #243D6A | 0.021 |
| Tritanopia (no blue cones) | #1F464E | 0.072 |
| Achromatopsia (no color) | #3F3F3F | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343C6B
#343C6B
oklch(37.3% 0.081 274.5)
- #4E3F00
#4E3F00
oklch(37.3% 0.076 93.6)
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 #343C6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.052
- Marine Blue #01386A ΔE 0.053
- Charcoal #264653 ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.064
- Cobalt #1E488F ΔE 0.066
Use #343C6B 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.