CoastSnap is a global citizen science initiative that leverages public participation to monitor coastline dynamics. This study evaluates the implementation and outcomes of CoastSnap Balears with two stations situated in natural parks that provide unique opportunities for data collection while addressing restrictions that limit traditional monitoring systems. Site-specific strategies have been carried out to foster inclusivity, transparency, and sustained participation, resulting in the collection of hundreds of shoreline positions (~5–8 per month). Local community involvement and partnerships with educational organizations proved critical for consistent, year-round monitoring. CoastSnap’s low-cost and flexible approach overcomes spatial and weather-related constraints, providing accurate (~2 m) and reliable data for coastal management. Furthermore, photographic evidence facilitates both qualitative and quantitative analyses of beach dynamics. These findings validate the scientific rigor and impact of citizen science for coastline monitoring and offer a scalable framework for enhancing community-driven data collection.