How I Built 20+ Calculators Using Next.js Without a Backend (Fully Client-Side)

Introduction I recently built a calculator-focused web app called AxarTools, where all calculations run entirely in the browser—no backend, no APIs, and no data storage. The goal was simple: make calculators fast keep everything private maintain a consistent UX across different tools You can check it here: https://axartools.com/ Why I avoided a backend Most calculators don’t actually need a server. For things like: EMI calculations income tax BMI retirement planning The logic is deterministic an