Network Spy is a cross-platform network proxy and traffic analyzer built with Tauri, Rust, and React. It helps developers intercept, inspect, decrypt, and debug HTTP(S) traffic through a fast and modern desktop interface.
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Requestly Alternatives
Requestly is described as 'Lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc' and is a http(s) debugger in the development category. There are more than 25 alternatives to Requestly for a variety of platforms, including Mac, Windows, Linux, Google Chrome and Web-based apps. The best Requestly alternative is Postman, which is free. Other great apps like Requestly are Fiddler, Yaak, mitmproxy and Hoppscotch.
Alternatives list
Upcoming API testing tool in beta, built in GoLang, supporting HTTP/gRPC, workspaces, environments, request management, and various content types. Features include dark mode, local data storage, Postman import, environment variable setting, and request chaining.
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gRPC is a modern open source high performance Remote Procedure Call (RPC) framework that can run in any environment. It can efficiently connect services in and across data centers with pluggable support for load balancing, tracing, health checking and authentication.
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Self-Hosted
Native desktop app for Windows offers high-performance REST and HTTP API testing, low memory and CPU use, custom methods, portable version, proxy support, multiple environments, code generation, multilingual interface, and import/export in light or dark themes.
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Open-source native macOS HTTP debugging proxy — intercept HTTPS, inspect APIs, mock responses, debug WebSocket & GraphQL. Community-driven. For developers, by developers.
+9
HarborClient is a free, open-source desktop API client for macOS, Windows, and Linux. It gives you a familiar Postman-style workspace—collections, environments, request scripts, and a tabbed editor—while keeping your work on your machine or on storage you control.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Windows
- Mac
- Linux
9 Jam.dev alternativesWith Jam, in one click, you can: take a screenshot, record a video, or capture an instant replay, and Jam will instantly generate a link to share with your team.
Cost / License
- Freemium
- Proprietary
Platforms
- Microsoft Edge
- Google Chrome
- Opera
- Brave
Header Override lets you modify or inject HTTP headers and cookies to customize web requests and responses.
Cost / License
- Free
- Open Source
Platforms
- Microsoft Edge
- Google Chrome
- Mozilla Firefox
44 HTTP Debugger alternativesHTTP Debugger captures and decrypts HTTP/HTTPS from any Windows app without proxy setup — HTTP/2, WebSocket, SSE, gRPC and localhost included. Edit and replay requests, modify traffic on the fly, and let an AI assistant read the session over the built-in MCP server.
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Kreya is a GUI client for gRPC, REST and WebSocket APIs with innovative features for environments, authorizations and more.
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17 Live HTTP Headers alternativesThe goal of this project is to adds information about the HTTP headers in three ways:
Built from the ground up for mobile developers. Monitor network requests, logs, and events in real-time. Debug faster, ship with confidence.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Online
- Android
- iPhone
- iPad
- Software as a Service (SaaS)
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