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I built VioLens, a free and open-source successor to Fiddler Classic for Windows and macOS

For years, Fiddler Classic was the tool I reached for whenever I needed to see what a browser or app was really sending over HTTP(S). It hasn't had a major update in a long time, it only ever ran on Windows, and this year its licence changed to non-commercial use only. So I started building a replacement that anyone can use for anything, for free. VioLens is a debugging proxy. You start it, it becomes the system proxy, and every request your browsers and apps make shows up i

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痛点：Fiddler Classic 长期不更新、仅支持 Windows，且今年改为非商业许可，商业开发者需要跨平台、许可友好的 HTTP(S) 调试代理替代品。

目标用户：需要抓包调试 HTTP(S) 的 Windows/macOS 开发者、测试人员和安全研究人员，尤其是因 Fiddler 许可变更被迫迁移的商业团队。

证据：It hasn't had a major update in a long time, it only ever ran on Windows, and this year its licence changed to non-commercial use only. So I started building a replacement that anyone can use for anything, for free.

变现：开源核心 + 付费 Pro 版：团队协作、HTTP/2、SOCKS、客户端证书、云同步、商业支持或托管版；也可采用双许可。

MVP：两周内基于 mitmproxy 或现有代理引擎封装跨平台 GUI，聚焦 Fiddler 迁移：导入 SAZ、AutoResponder、断点编辑请求/响应，并提供商业友好许可。

竞品：Fiddler Everywhere、Charles Proxy、Proxyman、mitmproxy、HTTP Toolkit

摘要：作者因 Fiddler Classic 长期不更新、仅支持 Windows、2025 年改为非商业许可，用 .NET 10 + Avalonia 开发了 MIT 开源的跨平台调试代理 VioLens，支持请求解密、断点、AutoResponder 和 SAZ 导入，目前为预览版，尚不支持 HTTP/2、客户端证书和 SOCKS。项目本身免费，但验证了 Fiddler 许可变更带来的迁移需求。