DECipher is an AI-powered platform built by I4DI that synthesizes insights from over 13,000 documents in the Development Experience Clearinghouse (DEC), harnessing 75 years of global development data. It uses CREW AI, a system of specialized large language model (LLM) agents—including Methodology, Technical, Project Implementation, MEL, Rule and Regulation, and Communication agents—to provide tailored, context-aware recommendations for international development challenges. The platform is designed to support NGOs, government agencies, and development practitioners in making data-driven decisions, from program design and evaluation to scaling interventions. DECipher is offered as a free public good, aiming to democratize access to world-class research and evaluation capabilities.