FluxAPI is a fast, offline API testing tool for developers who want a powerful REST client without the cloud, the login screen, or the subscription. Test any endpoint, inspect real responses, and organize your work — all stored securely on your device, never in the cloud. Built as a lightweight native app, FluxAPI starts instantly and stays out of your way, with a clean, distraction-free dark interface designed for focus. Why developers choose FluxAPI: Send GET, POST, PUT, PATCH, and DELETE requests instantly View formatted, syntax-highlighted responses (JSON, XML, HTML) Inspect response headers, cookies, and status codes at a glance Organize requests into Collections for any project Switch between Dev, Staging, and Production instantly with Environments Automatic request History — every call you've made, saved locally Multi-tab workspace for testing multiple endpoints side by side 100% offline — your API keys, tokens, and data never leave your PC No account required, no subscription, no recurring fees Native performance — fast startup, low memory footprint FluxAPI is built for developers, QA engineers, and API testers who want a modern, no-nonsense alternative to bloated, cloud-first tools. One-time purchase. Yours forever.