A UX Audit is a deep, data-driven analysis that evaluates the entire user journey using analytics, user behavior, and business goals.
A Heuristic Evaluation is a faster expert review based on usability principles like Nielsen’s heuristics.
UX audits provide actionable insights tied to conversions and performance, while heuristic evaluations identify surface-level usability issues.
... https://altumind.ai/ux-audit-vs-heuristic-evaluation-which-is-better/