Which of the following is a commonly used altmetrics tool?

Altmetric.com is widely recognized as a leading altmetrics tool designed specifically to track and analyze the online engagement of scholarly publications. This platform collects data from various sources, including social media, news outlets, policy documents, and online reference managers, to provide a comprehensive view of how research outputs are being discussed and shared beyond traditional academic citations.

By using Altmetric.com, researchers and institutions can gauge the immediate impact of their work on the broader community, which can include policymakers, practitioners, and the public. It helps to visualize the reach of a publication through a single, integrated score known as the Altmetric Attention Score, reflecting the level of attention a piece of research has garnered.

In contrast, while ResearchGate is a social networking site for researchers and can provide some metrics related to popularity and engagement, it does not systematically aggregate broad altmetric data like Altmetric.com does. PLOS One is a peer-reviewed journal that publishes research outputs, but it does not serve as an altmetrics tool itself. Google Scholar is a widely used academic search engine that helps measure citations but is focused on traditional metrics rather than the broader impact that altmetrics tools, like Altmetric.com, provide.