#343B8D
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.134 274.8), rgb(52, 59, 141).
Aa
White text reads best on this color (9.73:1).
About this color
#343B8D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.134 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 9.73:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.15:1 |
| White text | 9.73:1 |
Values
| HEX | #343B8D |
| RGB | rgb(52, 59, 141) |
| HSL | hsl(235, 46%, 38%) |
| OKLCH | oklch(39.6% 0.134 274.8) |
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 #343B8D | 9.73:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #343B8D | 2.15:1 | Fails | Lc 11.7 | Not readable |
| #343B8D text on white | 9.73:1 | AAA | Lc 92.2 | Preferred for body text |
| #343B8D text on black | 2.15:1 | Fails | Lc -10.2 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8596FF
oklch(70.6% 0.154 274.8)
-
Step 500
500
#6A78FF
oklch(63.2% 0.198 274.8)
-
Step 600
600
#545AF2
oklch(55.6% 0.223 274.7)
-
Step 700
700
#4548D3
oklch(49.1% 0.208 274.7)
-
Step 800
800
#383CAB
oklch(42.6% 0.174 274.7)
-
Step 900
900 (this color)
#343B8D
oklch(39.6% 0.134 274.8)
-
Step 950
950
#1B204F
oklch(26.9% 0.086 274.6)
#343B8D 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) | #004890 | 0.048 |
| Deuteranopia (no green cones) | #00408B | 0.043 |
| Tritanopia (no blue cones) | #004F5E | 0.115 |
| Achromatopsia (no color) | #444444 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B8D
#343B8D
oklch(39.6% 0.134 274.8)
- #554500
#554500
oklch(39.6% 0.081 93.8)
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 #343B8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.036
- Cobalt #1E488F ΔE 0.038
- Sapphire #2138AB ΔE 0.055
- Twilight Blue #0A437A ΔE 0.055
- Light Navy #155084 ΔE 0.065
- Dusk Blue #26538D ΔE 0.066
- Twilight #4E518B ΔE 0.076
Use #343B8D 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.