Metaimpact is a platform that enables multiple stakeholders to build impact networks to confront the world’s biggest problems, like access to affordable healthcare, health equity, climate action, and closing the racial wealth gap. Impact networks use Metaimpact to align on purpose, assemble resources from individual organizations, and activate connections to create a venue of discovery (who is working on what?) a shared system of measurement (is it working?), and to coordinate and optimize the individual activities of each stakeholder to create collective impact and systems-level change. Big problems are entangled, so impact networks in Metaimpact can interconnect and layer, creating a digital nexus of commercial enterprises, nonprofits, and government agencies.