Fiddler Classic
Fiddler Classic: A free Windows proxy for inspecting, composing, mocking, and modifying HTTP(S) traffic. Ranked #5 of 25 in Local Development Proxy Tools by our editors (8.5/10); pricing: Free plan; best for windows users debugging traffic for non-commercial use.
At a glance
- Editor score8.5 / 10
- PricingFree plan
- Best forWindows users debugging traffic for non-commercial use
- Free planYes
- Paid fromNone
- HTTPS interceptionYes
- Facts checked4 Oct 2026
Where it wins
- Logs and inspects HTTP(S) traffic from browsers and desktop apps
- API Composer lets developers compose HTTP/S requests
- AutoResponder can mock responses and modify traffic
Where it doesn't
- Windows-only desktop availability limits platform fit
- Free use is limited to personal and other permitted non-commercial use
- Maintenance mode means it is not in active development
Our verdict on Fiddler Classic
Fiddler Classic is a Windows desktop proxy for developers who need to inspect and debug HTTP(S) traffic from browsers and desktop apps. It logs network traffic and provides tools to compose requests, mock responses, and modify traffic. Its audience is Windows users working on personal or other permitted non-commercial projects; it is not the right choice for commercial, business, organizational, or revenue-generating use, which Progress Telerik directs to Fiddler Everywhere.
The core workflow covers several practical debugging tasks in one tool. Developers can inspect HTTP/HTTPS traffic, compose HTTP/S requests with API Composer, and use AutoResponder to mock responses. The listed capabilities also include modifying HTTP/S traffic, making the product relevant when debugging involves changing what a request or response contains rather than only observing it. This makes Fiddler Classic a focused option for local traffic inspection and request-response debugging, rather than a broad development platform.
The main tradeoffs are platform and product status. Fiddler Classic is Windows-only, so developers working on other platforms should look elsewhere. The vendor describes it as being in maintenance mode and not in active development, which matters for teams seeking an actively developed tool. It is free for personal and other permitted non-commercial use, but commercial, business, organizational, and revenue-generating use requires Fiddler Everywhere. Community and documentation are the listed support channels. Choose Classic if Windows support and non-commercial use fit; choose another option if you need cross-platform coverage, active development, or a commercial license.
Your product? Our editors can test Fiddler Classic in depth and publish a review, labelled as paid · from $99/mo →
Fiddler Classic pricing
Fiddler Classic fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| HTTPS interception | Yes |
| Edit requests and responses | Yes |
| Mobile app debugging | Not verified |
| Supported platforms | Windows |
| API debugging tools | Yes |
| Deployment | Desktop |
| Platforms | Windows |
| Support | Community, Docs |
| Built for | Solo (editorial estimate) |
| Pricing | Free plan |
| Website | telerik.com |
| Facts checked | 4 Oct 2026 |
Alternatives to Fiddler Classic
- CharlesA cross-platform debugging proxy with deep traffic controls, sold through one-time licenses.9.2
- mitmproxyA scriptable proxy toolkit for inspecting, editing, replaying, and mocking web traffic.8.9
- HTTP ToolkitA cross-platform proxy for inspecting, rewriting, mocking, and replaying HTTP traffic.8.8
See all Fiddler Classic alternatives →
Fiddler Classic vs the competition
- Fiddler Classic vs Charles
- Fiddler Classic vs mitmproxy
- Fiddler Classic vs HTTP Toolkit
- Fiddler Classic vs Fiddler Everywhere
- Fiddler Classic vs Reqable
- Fiddler Classic vs Fluxzy
Compare Fiddler Classic with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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