Âm Lịch - Lịch Vạn Niên - Tử vi La bàn phong thủy is a free lifestyle application developed by GTSStar .co for Android users. This Vietnamese lunar calendar app allows users to view the lunar calendar, zodiac signs, and horoscopes of 12 zodiac animals and 12 constellations. It also provides information on auspicious and inauspicious days, weather forecasts, and birth rhythms.

The app features several functions, including La Ban Feng Shui, a tool that helps users determine the direction of their home's Feng Shui without having to spend extra money on purchasing a compass. The app also includes a variety of other functions such as fortune-telling, a bio-rhythm chart, a pregnancy wheel, and traditional Vietnamese folk games. With this app, users can also access a collection of Vietnamese proverbs, customs, and festivals.