#343763
Closest named color: Prussian Blue (#1D3557). oklch(35.7% 0.076 278.9), rgb(52, 55, 99).
Aa
White text reads best on this color (11.21:1).
About this color
#343763 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.076 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.040 away. White text reads best on it, at 11.21:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.87:1 |
| White text | 11.21:1 |
Values
| HEX | #343763 |
| RGB | rgb(52, 55, 99) |
| HSL | hsl(236, 31%, 30%) |
| OKLCH | oklch(35.7% 0.076 278.9) |
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 #343763 | 11.21:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #343763 | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #343763 text on white | 11.21:1 | AAA | Lc 95.8 | Preferred for body text |
| #343763 text on black | 1.87:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D7EE
oklch(88.4% 0.032 279.8)
-
Step 300
300
#B8BEE6
oklch(81% 0.057 278.4)
-
Step 400
400
#949BD9
oklch(70.7% 0.091 278.8)
-
Step 500
500
#7B81CE
oklch(63.1% 0.115 279.1)
-
Step 600
600
#6469BB
oklch(55.5% 0.126 278.8)
-
Step 700
700
#5357A2
oklch(49% 0.118 278.8)
-
Step 800
800
#444883
oklch(42.8% 0.097 278.5)
-
Step 900
900 (this color)
#343763
oklch(35.7% 0.076 278.9)
-
Step 950
950
#21243D
oklch(27% 0.047 277.6)
#343763 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) | #273D65 | 0.023 |
| Deuteranopia (no green cones) | #233962 | 0.024 |
| Tritanopia (no blue cones) | #244048 | 0.066 |
| Achromatopsia (no color) | #3B3B3B | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343763
#343763
oklch(35.7% 0.076 278.9)
- #463C00
#463C00
oklch(35.6% 0.074 98.7)
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 #343763, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.040
- Marine Blue #01386A ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.053
- Twilight Blue #0A437A ΔE 0.058
- Charcoal #264653 ΔE 0.063
- Gunmetal #293241 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.064
Use #343763 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.