The Step Change navigator in citizen science draws upon the experience of the Step Change project, aiming to generalise and upscale its learnings for the benefit of other citizen science practitioners embarking on their own journeys. Key features Presents a comprehensive overview of the citizen science landscape, including key concepts, and benefits Offers practical guidance on planning, implementing, and evaluating citizen science projects Shares insights and best practices from the Step Change project, including lessons learned, challenges faced, and successes achieved Provides a wealth of resources, including case studies, toolkits, and training materials The Step Change navigator in citizen science is intended as a valuable resource for anyone interested in citizen science. It provides a comprehensive overview of the field, practical guidance for project development, and inspiring insights from the Step Change project. This toolkit is intended for a wide audience, including Citizen science practitioners and researchers Policymakers and funders Educators and students Anyone interested in learning more about citizen science The online version of the Citizen Science Navigator is available here.