Glass It is a price tracking service that monitors product prices across multiple online retailers. Users can submit product URLs to receive daily price checks and email notifications when prices drop. The service compiles price history data and provides a dashboard with customizable widgets for comparing monitoring data. Setup and issue resolution are handled by human Web Engineers. Glass It uses reinforcement learning from human feedback (RLHF) to track online prices. It supports a wide range of retailers including Amazon, Walmart, eBay, Best Buy, Target, and many others. Price history is displayed after collecting at least three data points from verified users who have enabled push notifications.