The increasing prevalence of large-scale labor aggregation platforms, worker analytics, and algorithmic decision-making by management raises the question of whether workers can use similar technologies to advocate for their own goals. Yet, there are inherent challenges in building worker-centric tools that collect, aggregate, and share data in responsible and ethical ways. The Shipt Calculator is a tool developed in collaboration with nonprofit worker group Coworker.org and the Gig Worker’s Collective that allows app-based delivery workers to track and share aggregate data about their pay, increasing wage transparency.