You CANNOT compare more than three domains with the help of Keyword Gap.

The statement is false because Semrush's Keyword Gap tool allows you to compare up to five domains simultaneously. This feature is crucial for comprehensive competitor analysis, enabling you to identify keyword opportunities and gaps across multiple rivals. Limiting the comparison to three domains (as suggested in the false statement) would restrict the depth of competitive insights, making it harder to develop a robust keyword strategy. Therefore, the ability to compare five domains provides a more complete picture of the competitive landscape.