Impactstory is a free web-based tool developed in part by a doctoral student at the University of North Carolina. Impactstory provides metrics from a variety of sources and normalizes those metrics based on comparison sets. Impactstory provides metrics for journal articles, data sets, slides and other research products.
Here are some of the metrics that Impactstory collects:
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"The study and use of non-traditional scholarly impact measures that are based on activity in web-based environments."
Source: https://collections.plos.org/altmetrics
Examples of altmetrics include:
"Altmetrics expand our view of what impact looks like, but also of what's making the impact. This matters because expressions of scholarship are becoming more diverse." Source: https://altmetrics.org/manifesto/
Two services, Altmetric and Impactstory, that aggregate these types of metrics are described below.
Altmetric offers a free bookmarklet that allows you to view article-level metrics for the articles that you read online. To get started, drag and drop the Altmetric bookmarklet to the bookmarks bar in your web browser. Works for Chrome, Firefox and Safari. Due to some limitations, the bookmarklet may not work for every article.