Usability testing and web analytics are both quantitative UX research methods, but they differ in cost, control, and the kind of insight produced:

• Usability testing is conducted in a controlled or moderated setting and is comparatively expensive, but it lets researchers observe why users succeed or fail at specific tasks (e.g., time on task, success rate).
• Web analytics passively records real user behavior in the wild (page views, clicks, feature usage, drop-off points) at low cost, showing what users do at scale, but not why they do it.