Prana is an AI primary care platform that replaces reactive annual physicals with continuous, proactive health monitoring. It aggregates medical records and wearable data to detect subtle health declines ('clinical drift') between visits, combining AI analysis with physician oversight and automating most administrative tasks so human doctors can focus on critical decisions. The platform offers 24/7 physician care at lower cost. The company is based in the San Francisco Bay Area and is part of Y Combinator's Winter 2026 batch.