Stockstack.ai is an AI-powered tool that helps users stay updated on their investments in one interface. It provides market news, stock tickers, and sector performance information. Users can set up their watchlists to keep track of their preferred stocks and monitor their performance. The tool offers a widget that provides AI-assisted guidance on stock picking. It has a variety of use cases for investors, traders, and financial professionals looking to stay up-to-date on the latest market trends.