#343D91
Closest named color: Blueberry (#464196). oklch(40.3% 0.137 273.9), rgb(52, 61, 145).
Aa
White text reads best on this color (9.44:1).
About this color
#343D91 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.137 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.031 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #343D91 |
| RGB | rgb(52, 61, 145) |
| HSL | hsl(234, 47%, 39%) |
| OKLCH | oklch(40.3% 0.137 273.9) |
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 #343D91 | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #343D91 | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #343D91 text on white | 9.44:1 | AAA | Lc 91.5 | Preferred for body text |
| #343D91 text on black | 2.22:1 | Fails | Lc -10.9 | 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 800.
-
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
#CFD8F7
oklch(88.5% 0.044 272.7)
-
Step 300
300
#B0BDF5
oklch(80.8% 0.081 274.3)
-
Step 400
400
#889AF0
oklch(70.8% 0.127 273.7)
-
Step 500
500
#6C7EEB
oklch(63.1% 0.164 273.7)
-
Step 600
600
#5664D9
oklch(55.6% 0.178 274)
-
Step 700
700
#4752BD
oklch(49.1% 0.167 274.1)
-
Step 800
800 (this color)
#343D91
oklch(40.3% 0.137 273.9)
-
Step 900
900
#313A79
oklch(37.6% 0.107 274)
-
Step 950
950
#1D2347
oklch(27.1% 0.067 274)
#343D91 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) | #004A94 | 0.047 |
| Deuteranopia (no green cones) | #00428F | 0.042 |
| Tritanopia (no blue cones) | #005161 | 0.115 |
| Achromatopsia (no color) | #464646 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343D91
#343D91
oklch(40.3% 0.137 273.9)
- #574700
#574700
oklch(40.3% 0.083 94.2)
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 #343D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.031
- Dark Slate Blue #483D8B ΔE 0.032
- Cobalt #1E488F ΔE 0.035
- Sapphire #2138AB ΔE 0.050
- Twilight Blue #0A437A ΔE 0.058
- Dusk Blue #26538D ΔE 0.061
- Light Navy #155084 ΔE 0.063
- Twilight #4E518B ΔE 0.072
Use #343D91 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.