Proxyman is an HTTP debugging proxy that captures, decrypts, and mocks network traffic from apps and browsers. It is built as a native macOS app with versions for iOS, Android, Windows, and Linux.

Traffic inspection - View HTTP and HTTPS requests and responses in plain text with syntax highlighting and filters.
Breakpoint and Map Local - Pause requests to edit them, or answer with a local file to test without a backend.
Scripting - Rewrite requests and responses with JavaScript snippets and add-ons.
GraphQL and WebSocket - Debug GraphQL operations by name and inspect live WebSocket frames.
Team workspaces - Share logs, sync settings, and manage members across a team.

It is used by developers debugging APIs and mobile apps, including iOS simulator and Android emulator traffic.