#343B99
Closest named color: Blueberry (#464196). oklch(40.6% 0.151 274.2), rgb(52, 59, 153).
Aa
White text reads best on this color (9.41:1).
About this color
#343B99 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.151 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.033 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #343B99 |
| RGB | rgb(52, 59, 153) |
| HSL | hsl(236, 49%, 40%) |
| OKLCH | oklch(40.6% 0.151 274.2) |
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 #343B99 | 9.41:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #343B99 | 2.23:1 | Fails | Lc 12.7 | Not readable |
| #343B99 text on white | 9.41:1 | AAA | Lc 91.3 | Preferred for body text |
| #343B99 text on black | 2.23:1 | Fails | Lc -11.0 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#AFBDFA
oklch(80.9% 0.088 274.3)
-
Step 400
400
#8698F8
oklch(70.7% 0.142 274.2)
-
Step 500
500
#6B7BF5
oklch(63.1% 0.181 274.4)
-
Step 600
600
#5560E3
oklch(55.5% 0.196 274.4)
-
Step 700
700
#464FC6
oklch(49.2% 0.183 274.2)
-
Step 800
800 (this color)
#343B99
oklch(40.6% 0.151 274.2)
-
Step 900
900
#30397F
oklch(37.8% 0.118 273.9)
-
Step 950
950
#1C224A
oklch(27% 0.074 274)
#343B99 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) | #004B9C | 0.050 |
| Deuteranopia (no green cones) | #004297 | 0.042 |
| Tritanopia (no blue cones) | #005264 | 0.125 |
| Achromatopsia (no color) | #464646 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343B99
#343B99
oklch(40.6% 0.151 274.2)
- #584800
#584800
oklch(40.6% 0.083 94.4)
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 #343B99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.033
- Sapphire #2138AB ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.040
- Cobalt #1E488F ΔE 0.042
- Indigo Blue #3A18B1 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.069
- Dusk Blue #26538D ΔE 0.069
- Light Navy #155084 ΔE 0.073
Use #343B99 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.