#343D8B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.8% 0.129 274.1), rgb(52, 61, 139).
Aa
White text reads best on this color (9.60:1).
About this color
#343D8B 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 9.60:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.60:1 |
Values
| HEX | #343D8B |
| RGB | rgb(52, 61, 139) |
| HSL | hsl(234, 46%, 37%) |
| OKLCH | oklch(39.8% 0.129 274.1) |
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 #343D8B | 9.60:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #343D8B | 2.18:1 | Fails | Lc 12.0 | Not readable |
| #343D8B text on white | 9.60:1 | AAA | Lc 91.9 | Preferred for body text |
| #343D8B text on black | 2.18:1 | Fails | Lc -10.5 | 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
#CED7FD
oklch(88.4% 0.053 274.8)
-
Step 300
300
#ADBCFF
oklch(80.8% 0.096 274.3)
-
Step 400
400
#8497FF
oklch(70.7% 0.153 274)
-
Step 500
500
#6878FE
oklch(63% 0.198 274.1)
-
Step 600
600
#535DED
oklch(55.7% 0.213 274.1)
-
Step 700
700
#444BCF
oklch(49.2% 0.2 274)
-
Step 800
800
#373FA7
oklch(42.8% 0.165 273.7)
-
Step 900
900 (this color)
#343D8B
oklch(39.8% 0.129 274.1)
-
Step 950
950
#1B214D
oklch(27% 0.081 273.9)
#343D8B 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) | #05498E | 0.045 |
| Deuteranopia (no green cones) | #004189 | 0.042 |
| Tritanopia (no blue cones) | #004F5E | 0.109 |
| Achromatopsia (no color) | #454545 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343D8B
#343D8B
oklch(39.8% 0.129 274.1)
- #564600
#564600
oklch(39.9% 0.082 94)
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 #343D8B, 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 0.034
- Blueberry #464196 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.051
- Sapphire #2138AB ΔE 0.059
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.060
- Twilight #4E518B ΔE 0.071
Use #343D8B 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.