Impactstory is a service that provides open metrics and contextual information on the impact of researchers' work, including where their work has been cited, saved, viewed, discussed, and shared. It delivers these open metrics for diverse research outputs like articles, datasets, and software through researcher profiles. Impactstory's data, code, and governance are also open. The service aims to help incentivize open science through providing these altmetrics on research dissemination and impact.