httpmon
httpmon: A free, scriptable proxy for detailed HTTP debugging on macOS and Linux. Ranked #8 of 27 in Web Debugging Proxies by our editors (8.5/10); pricing: Free plan; best for open-source macOS and Linux debugging teams.
At a glance
- Editor score8.5 / 10
- PricingFree plan
- Best forOpen-source macOS and Linux debugging teams
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Free and open-source with no account or paid tiers
- Breakpoints, replay, mocking, throttling, and JavaScript hooks
- Decodes gRPC-Web and Protobuf traffic with MCP support
Where it doesn't
- Platform coverage is limited to macOS and Linux
- Terminal-focused workflows may not suit GUI-first teams
- WebSocket debugging is not a stated strength
Our verdict on httpmon
httpmon is an open-source HTTP/HTTPS debugging proxy for developers and technical teams working from macOS or Linux terminals. It intercepts traffic through a man-in-the-middle proxy, automatically generates CA certificates, and presents live flows with host and process grouping. The product is aimed at teams debugging applications locally or across SSH, Docker, and CI environments, especially when command-line access and programmatic inspection matter.
According to the vendor's published plan information, httpmon is completely free, has no paid tiers, and requires no account. Its feature set covers the main stages of traffic analysis: filtering live flows, inspecting request and response details, editing traffic with JavaScript hooks and breakpoints, exporting HAR files, replaying requests, composing requests, and copying cURL commands. Side-by-side diffs, response mocking, local-file mapping, and bandwidth throttling for 3G, 4G, and WiFi conditions add useful controls for reproducing application behavior.
The strongest fit is for teams that want a focused debugging proxy with scripting and terminal access rather than a GUI-first tool. gRPC-Web and Protobuf body decoding extend its usefulness for services that use those formats, while the MCP server supports programmatic traffic inspection and debugging. Its verified platform scope is macOS and Linux, so teams working on other desktop platforms should choose an alternative with broader coverage. Likewise, organizations seeking a wider desktop ecosystem or a less terminal-centric workflow may find httpmon too narrow. Choose it for free, open-source HTTP debugging on supported systems; look elsewhere when platform breadth or GUI-oriented work is the priority.
Your product? Our editors can test httpmon in depth and publish a review, labelled as paid · from $149/mo →
httpmon pricing
httpmon fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Platforms | Not verified |
| Request/response editing | Yes |
| Breakpoint rules | Yes |
| Traffic replay | Yes |
| Response mocking | Yes |
| WebSocket inspection | Not verified |
| Proxy chaining | Not verified |
| Deployment | Desktop |
| Platforms | macOS, Linux |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Free plan |
| Website | httpmon.dev |
| Facts checked | 20 Sep 2026 |
Alternatives to httpmon
- mitmproxyA broad, programmable proxy for debugging HTTP, HTTPS, WebSockets, and related traffic.9.4
- FluxzyA broad debugging proxy with a capable free personal tier and €49 perpetual Pro access.9.3
- HTTP ToolkitA broad HTTP debugging proxy for teams working across browsers, apps, containers, and APIs.9.2
See all httpmon alternatives →
httpmon vs the competition
- httpmon vs mitmproxy
- httpmon vs Fluxzy
- httpmon vs HTTP Toolkit
- httpmon vs Fiddler Everywhere
- httpmon vs NetworkSpy
- httpmon vs HTTPeep
Compare httpmon with any tool side by side →
Used httpmon? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used httpmon for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
httpmon is listed in our Web Debugging Proxies directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/httpmon/"><img src="https://www.itechguides.com/best/badge/httpmon.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update