Transaction Cost Analysis (TCA) software measures and evaluates trade execution quality by quantifying the costs institutional investors incur when buying or selling securities. These platforms decompose total transaction costs into explicit components like commissions and fees alongside implicit costs including market impact, timing costs, and spread. TCA solutions operate across three temporal modes: pre-trade analytics that forecast costs and inform venue selection, real-time monitoring that tracks execution against benchmarks, and post-trade analysis that assesses broker performance using metrics such as implementation shortfall, VWAP, and arrival price. The category has evolved from basic benchmark comparison tools into sophisticated systems that integrate with order management platforms, apply microstructure models to isolate alpha from execution drag, and generate regulatory reporting for MiFID II best execution obligations and similar compliance frameworks worldwide.