This Quickstart Guide provides step-by-step instructions for using Surv, a web-based platform for survival analysis and model extrapolation. It explains how to upload Kaplan–Meier data or CSV datasets, digitize survival curves, fit standard parametric, spline, and mixture cure models, and export results for health-economic evaluation. The guide includes annotated screenshots, workflow explanations, and modeling tips for users preparing analyses for HTA or cost-effectiveness submissions.