#343A82
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.12 275.7), rgb(52, 58, 130).
Aa
White text reads best on this color (10.12:1).
About this color
#343A82 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.120 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.12:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #343A82 |
| RGB | rgb(52, 58, 130) |
| HSL | hsl(235, 43%, 36%) |
| OKLCH | oklch(38.5% 0.12 275.7) |
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 #343A82 | 10.12:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #343A82 | 2.07:1 | Fails | Lc 10.7 | Not readable |
| #343A82 text on white | 10.12:1 | AAA | Lc 93.2 | Preferred for body text |
| #343A82 text on black | 2.07:1 | Fails | Lc -9.3 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFB
oklch(80.9% 0.09 275.9)
-
Step 400
400
#8897F9
oklch(70.7% 0.144 275.5)
-
Step 500
500
#6E7AF6
oklch(63.2% 0.183 275.7)
-
Step 600
600
#585FE5
oklch(55.7% 0.2 275.5)
-
Step 700
700
#494DC7
oklch(49.1% 0.186 275.7)
-
Step 800
800
#3B40A1
oklch(42.7% 0.154 275.5)
-
Step 900
900 (this color)
#343A82
oklch(38.5% 0.12 275.7)
-
Step 950
950
#1D214B
oklch(27% 0.077 275.9)
#343A82 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) | #0D4585 | 0.043 |
| Deuteranopia (no green cones) | #003E81 | 0.045 |
| Tritanopia (no blue cones) | #004B58 | 0.106 |
| Achromatopsia (no color) | #424242 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343A82
#343A82
oklch(38.5% 0.12 275.7)
- #514300
#514300
oklch(38.6% 0.079 95.5)
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 #343A82, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Cobalt #1E488F ΔE 0.044
- Twilight Blue #0A437A ΔE 0.047
- Blueberry #464196 ΔE 0.048
- Light Navy #155084 ΔE 0.064
- Marine Blue #01386A ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
- Sapphire #2138AB ΔE 0.071
Use #343A82 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.