Finviz

Finviz (Financial Visualizations) is a highly popular web-based platform renowned for its powerful stock screener, allowing users to filter companies based on a wide range of fundamental and technical metrics. It's also famous for its market heatmaps providing intuitive sector/industry performance views, alongside charting features, news aggregation, and insider trading tracking. Operates on a freemium model, ideal for quickly spotting opportunities or risks.