Abstract
Wikidata as a collaborative Semantic Web data source has enjoyed increasing prominence, storing over 150 million facts about more than 26 million entities. Yet it is missing a way to assess its complete- ness. In this demo we present COOL-WD, a tool for supporting the completeness lifecycle of Wikidata, that is, the creation, view, update, and consumption of metadata about Wikidata completeness. COOL-WD is available at http://cool-wd.inf.unibz.it/ and has so far collected more than 10,000 completeness statements.