HKStock is a free Android app developed by Davey Fong that enables users to manage and analyze Hong Kong stock market data. The app's main feature is its landscape display, which provides users with more information about the stock market. The app offers a 1-day to 1-year candlestick chart for better analysis of the stock market.

One of the unique features of HKStock is the ability to create custom stock profiles with a slide-screen toggle. However, it is important to note that the app does not provide instant or delayed market data, and the app is only available in Chinese. Overall, HKStock is a useful tool for those who want to manage and analyze Hong Kong stock market data, but it is recommended for Chinese speakers only.