The app provides stock prices along with real-time trading turnover data, quota balances, index tracking and corporate disclosures made to the exchange.
It will also cover information about Shenzhen-Hong Kong Stock Connect when it launches.
"This new account is part of our broader outreach efforts in mainland China, designed to help educate the market about how the Hong Kong securities market works and how to find the information they need," said Mao Zhirong, co-head of the exchange’s mainland division.
"The app is very easy to use and is perfect for getting quick updates on market performance or looking deeper into listed company announcements right from your phone or tablet."
The app is bieng introduced at a time when retail investors in China are driving record turnover in Hong Kong and surging capital flows in Shanghai.
A series of monetary easing measures and capital market reforms have already inflated the China A-share market. Morgan Stanley Investment Management recently warned about a bubble and said there was a worrying disconnect between the country’s economic growth and stock market performance.
Chinese retail investors particularly are increasingly playing the price gaps between onshore and offshore markets. The onshore liquidity has been flowing into Hong Kong-listed China shares due to their relatively lower valuations.
The year-to-date performance of China and Hong Kong indices: