BigQuery Cost Estimator is a Chrome extension designed to assist users in managing and optimizing their BigQuery expenses. It provides an intuitive interface that allows users to visualize the costs associated with their queries in real time. This tool is particularly beneficial for those who want to maintain control over their budget and avoid unexpected charges.

Key features of the extension include visual cost indicators that categorize expenses into three color-coded levels: green for costs between $0 and $0.5, orange for costs between $0.5 and $1, and red for costs exceeding $1. Additionally, the extension prioritizes user privacy by not collecting any data, relying solely on DOM data when a BigQuery page is active. This ensures a secure and efficient way to monitor BigQuery usage.