Formerly known as Total Impact, Impact Story is a free open source tool designed to support URL-based publishing through the aggregation of online altmetrics. Users create collections of materials through online identifiers, such as Google Scholar Profiles, DOIs, and PubMed IDs. Impact Story uses more than a dozen APIs to search for metrics on these collected items, with sources ranging from popular social media to scholarly tools like Mendeley and PLoS. Items are subsequently assigned impact categories, such as generally/highly “saved,” “cited,” “recommended,” or “discussed.” This resource is most useful for researchers publishing in nontraditional venues or with scholarship too new to have accumulated traditional citations. Not a comprehensive source for tracing Web impact.