#343C7E
Closest named color: Dark Slate Blue (#483D8B). oklch(38.6% 0.111 274.8), rgb(52, 60, 126).
Aa
White text reads best on this color (10.03:1).
About this color
#343C7E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.111 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.03:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.03:1 |
Values
| HEX | #343C7E |
| RGB | rgb(52, 60, 126) |
| HSL | hsl(234, 42%, 35%) |
| OKLCH | oklch(38.6% 0.111 274.8) |
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 #343C7E | 10.03:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #343C7E | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #343C7E text on white | 10.03:1 | AAA | Lc 93.1 | Preferred for body text |
| #343C7E text on black | 2.09:1 | Fails | Lc -9.4 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F8
oklch(88.4% 0.046 276)
-
Step 300
300
#B0BDF7
oklch(80.9% 0.083 274.6)
-
Step 400
400
#8999F3
oklch(70.8% 0.133 274.9)
-
Step 500
500
#6D7CEE
oklch(63% 0.17 274.8)
-
Step 600
600
#5762DD
oklch(55.5% 0.185 274.8)
-
Step 700
700
#4851BF
oklch(49.2% 0.17 274.7)
-
Step 800
800
#3B439B
oklch(42.8% 0.142 274.8)
-
Step 900
900 (this color)
#343C7E
oklch(38.6% 0.111 274.8)
-
Step 950
950
#1D2248
oklch(27% 0.07 275)
#343C7E 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) | #1A4580 | 0.035 |
| Deuteranopia (no green cones) | #0D3F7D | 0.039 |
| Tritanopia (no blue cones) | #084B57 | 0.098 |
| Achromatopsia (no color) | #424242 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343C7E
#343C7E
oklch(38.6% 0.111 274.8)
- #524300
#524300
oklch(38.7% 0.079 94.4)
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 #343C7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.044
- Blueberry #464196 ΔE 0.051
- Light Navy #155084 ΔE 0.059
- Marine Blue #01386A ΔE 0.063
- Dusk Blue #26538D ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.073
Use #343C7E 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.