The Solar Desalination Still is an innovative water purification system designed to provide a sustainable and cost-effective solution for freshwater generation in coastal areas. The system integrates solar desalination with reverse osmosis (RO) and employs IoT-based automation to optimize water output. Key Features: Dual Purification System: Uses solar desalination when temperatures are high and switches to RO when lower, ensuring continuous water availability. Smart Switching Mechanism: An Arduino Uno and ESP32-based circuit automatically selects the appropriate purification method based on real-time temperature data fetched from an API. IoT Integration: A mobile app allows users to monitor and control water output remotely. Sustainable and Cost-Effective: Reduces reliance on electricity and provides an eco-friendly alternative for desalination.