#343E8C
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.129 273.6), rgb(52, 62, 140).
Aa
White text reads best on this color (9.48:1).
About this color
#343E8C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.031 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #343E8C |
| RGB | rgb(52, 62, 140) |
| HSL | hsl(233, 46%, 38%) |
| OKLCH | oklch(40.1% 0.129 273.6) |
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 #343E8C | 9.48:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #343E8C | 2.21:1 | Fails | Lc 12.3 | Not readable |
| #343E8C text on white | 9.48:1 | AAA | Lc 91.6 | Preferred for body text |
| #343E8C text on black | 2.21:1 | Fails | Lc -10.7 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD7FD
oklch(88.4% 0.054 273.7)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6779FE
oklch(63.1% 0.197 273.6)
-
Step 600
600
#515DEE
oklch(55.6% 0.215 273.5)
-
Step 700
700
#434BCF
oklch(49.1% 0.2 273.7)
-
Step 800
800
#373FA7
oklch(42.8% 0.165 273.7)
-
Step 900
900 (this color)
#343E8C
oklch(40.1% 0.129 273.6)
-
Step 950
950
#1B214D
oklch(27% 0.081 273.9)
#343E8C 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) | #074A8F | 0.044 |
| Deuteranopia (no green cones) | #00428A | 0.042 |
| Tritanopia (no blue cones) | #00505E | 0.111 |
| Achromatopsia (no color) | #464646 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343E8C
#343E8C
oklch(40.1% 0.129 273.6)
- #574600
#574600
oklch(40% 0.082 93)
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 #343E8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.031
- Cobalt #1E488F ΔE 0.032
- Blueberry #464196 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.058
- Dusk Blue #26538D ΔE 0.058
- Sapphire #2138AB ΔE 0.058
- Twilight #4E518B ΔE 0.069
Use #343E8C 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.