A set of tools that enables investors to easily sort through the thousands of companies and growing number of exchange-traded funds (ETFs) available in the stock market, using investors' chosen criteria. Most brokerage trading platforms offer free stock screeners. However, for those investors looking for platforms that provide more in-depth scanning features, several independent subscription-based stock screeners are also available. Stock screening tools let individuals use their own criteria for finding stocks or ETFs that can be attractive for long-term investors, or identify prospective opportunities for shorter-term traders.