Apps similar to Network Link Conditioner include Charles. It's paid, but Rockxy and Cloak Proxy are free. Other options are Proxyman, macOS Network Throttler and HTTPeep. In total there are six HTTP(S) Debuggers like Network Link Conditioner for Mac, Linux, Windows, iPhone and iPad.
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
New Zealand
Monitor, intercept and debug HTTP/HTTPS and WebSocket traffic on macOS, iOS, Windows, and Linux. Includes advanced features such as Breakpoint, Map Local/Remote, scripting, filtering, reverse proxy, DNS spoofing, and automation for backend development.
United States
Open-source native macOS HTTP debugging proxy — intercept HTTPS, inspect APIs, mock responses, debug WebSocket & GraphQL. Community-driven. For developers, by developers.
A lightweight macOS menu bar app for simulating poor network conditions instantly. Test your apps on 3G, Edge, high latency, or packet loss system-wide with a single click.
United Kingdom
Free native HTTPS debugging proxy for Mac (Linux beta) with a built-in API client and an MCP server for AI coding assistants.
India
Modern HTTP debugging tool, Debug, mock, and rewrite HTTP/HTTPS traffic with composable rules.
United States
