Best Fiddler Alternatives In 2027

For two decades Fiddler Classic was the default HTTP debugging proxy on Windows, and it was free. That changed on August 3, 2026, when Progress updated the Fiddler Classic license to non-commercial use only and gave businesses until September 17, 2026 to move. Any company still running Fiddler Classic for work is now outside its license terms.

Progress wants commercial users on Fiddler Everywhere, its cross-platform subscription product, and for many teams that is the easiest switch. But the license change has pushed a lot of developers, testers and security engineers to look at the wider market, where several strong tools cost less, run on more platforms or are fully open source. For the rest of the .NET toolchain, see our guide to the best .NET developer tools.

Here are 10 Fiddler alternatives worth evaluating in 2027, ranked on HTTPS interception and editing features, platform coverage, automation and licensing value.

Fiddler Alternatives At A Glance

Best Fiddler Alternatives In 2027

1. Fiddler Everywhere — The Supported Commercial Fiddler For Windows, macOS And Linux

Fiddler Everywhere is Progress’s current Fiddler product and the one the new Classic license points businesses to. It captures and decrypts HTTP and HTTPS traffic on Windows, macOS and Linux, with rules for modifying requests and responses, a composer for crafting calls, and team collaboration features for sharing captured sessions.

Progress has leaned into migration. A built-in wizard moves Fiddler Classic settings, filters and rules across, and version 8.3.0, released October 21, 2026, added support for custom inspectors built for Fiddler Classic on Windows. Recent releases also capture AI agent calls and expose features through an MCP server.

It is subscription only, with Pro and Enterprise tiers licensed per user per year, and Enterprise adds SSO, offline mode and policy-driven installation. Teams that relied on FiddlerScript automation should test their scripts, since Everywhere does not run Classic’s scripting model one for one.

Best for: Organizations that want the least disruptive move off Fiddler Classic and are comfortable with a per-user subscription.

2. Charles Proxy — A Veteran Debugging Proxy At A One-Time $50 Price

Charles is the other long-standing name in HTTP debugging. It records, inspects and decrypts HTTP and HTTPS traffic, and supports breakpoints, request editing, repeat, throttling, map local and map remote, and rewrite rules. Charles 5 was released on March 12, 2025.

The price is the draw. A user license costs $50 one-time, falling to $40 for five or more and $30 for ten or more, with site licenses at $400 and multi-site licenses at $700. Licenses cover the current major version, and upgrades cost 40% of the original price.

The Java interface looks dated next to newer tools, and there is no scripting environment comparable to FiddlerScript or mitmproxy’s Python add-ons.

Best for: Developers and QA teams who want a stable, full-featured proxy without a recurring subscription.

3. Proxyman — Modern Native Debugging Proxy With A Companion iOS App

Proxyman began as a native macOS app and now runs on Windows and Linux as well, with an iOS app for capturing traffic directly on iPhones and iPads. It is popular with mobile and API developers for its clean interface, quick device setup and strong tools for breakpoints, map local, map remote, scripting and request diffing.

The Standard license costs $89 for one seat across macOS, Windows and Linux, as a perpetual license with one year of updates and optional renewal at $49. Team licenses cost $99 per seat per year with a five-seat minimum and add central license management.

The free trial limits pinned domains and rules, so serious evaluation needs a demo key, and its heritage means the Mac version still leads on polish.

Best for: Mobile and API developers who want a modern, fast proxy and frequently debug iOS or Android apps.

4. HTTP Toolkit — Open-Source Interception With One-Click Setup For Browsers, Docker And Android

HTTP Toolkit is an open-source tool for intercepting, inspecting and mocking HTTP and HTTPS traffic. Its standout feature is setup: one click intercepts a fresh browser, terminal, Node.js process, Docker container or Android device without manual proxy and certificate configuration.

The free Hobbyist plan covers interception and inspection. Pro adds the features most professionals need, including rules for rewriting and mocking traffic, import and export of captured sessions and advanced configuration, and Team plans add shared accounts. It runs on Windows, macOS and Linux.

It is built largely by a single developer, which may matter to risk-averse buyers, and some editing features that are free in other tools require Pro.

Best for: Developers who want the fastest path from install to intercepted traffic, especially for containers and Android.

5. mitmproxy — Free, Scriptable Proxy With Console, Web And Python Interfaces

mitmproxy is a free, open-source interactive HTTPS proxy with three faces: an interactive console interface, mitmweb for a browser-based view, and mitmdump for headless capture. It supports HTTP/1, HTTP/2, HTTP/3 and WebSockets.

Its real strength is automation. Python add-ons can inspect and change any request or response, which makes mitmproxy the closest open-source match for teams that built workflows on FiddlerScript, and it fits naturally into test pipelines and containers.

There is no polished desktop GUI, and the learning curve is steeper than point-and-click tools.

Best for: Engineers who want a free proxy they can script and automate in CI or test environments.

6. Burp Suite — The Security Tester’s Proxy With Scanner And Repeater

Burp Suite from PortSwigger is the standard intercepting proxy for web application security testing. Its proxy, Repeater and Intruder tools let you capture, modify and replay traffic in depth, and the Professional edition adds an automated vulnerability scanner and the BApp extension store.

Community Edition is free with manual tools only. Professional costs $499 per user per year after a January 2026 price increase and now includes Burp AI features. Burp Suite DAST, the automated enterprise product, is quote-based.

Burp is built for security work, so developers who only want to debug their own API calls may find it more than they need.

Best for: Security and QA teams testing web applications and APIs for vulnerabilities.

7. ZAP — Free Open-Source Intercepting Proxy And Security Scanner

ZAP, formerly OWASP ZAP and now maintained with Checkmarx backing, is a free, open-source intercepting proxy and web application scanner licensed under Apache 2.0. It intercepts and edits traffic, spiders applications, runs active and passive scans, and has a large add-on marketplace.

ZAP is designed for automation, with an API, Docker images and ready-made scan packages for CI pipelines. That makes it a practical free option for teams that want both traffic inspection and security checks in their builds.

As a debugging tool for everyday API work it is less convenient than Fiddler or Proxyman, and the interface is functional rather than polished.

Best for: Teams that want a free proxy combined with automated security scanning in CI.

8. Wireshark — Free Packet Analyzer For Problems Below The HTTP Layer

Wireshark is the free, open-source standard for capturing and analyzing network packets. It decodes hundreds of protocols, which makes it the right tool when an issue sits below HTTP, such as TLS handshakes, DNS, TCP resets or non-HTTP protocols that a debugging proxy cannot see.

It can decrypt TLS traffic when you supply session keys, and its filters and statistics are unmatched for deep network troubleshooting. It runs on Windows, macOS and Linux.

Wireshark is not a debugging proxy: it does not let you edit or replay requests the way Fiddler does, so most teams use it alongside one of the tools above rather than instead of them.

Best for: Network and backend engineers diagnosing connection-level and protocol problems.

9. Postman — API Client For Building, Replaying And Testing Requests

Postman is best known as an API client, and it covers much of what developers used Fiddler’s Composer for: building requests, saving them in collections, replaying them with variables and writing tests against the responses. Its built-in proxy and Interceptor can also capture traffic from browsers and devices into a collection.

Collections, environments and mock servers make Postman strong for teams that want to document and automate API calls rather than only watch them. A free plan covers individual work, with paid plans for team collaboration and governance.

Postman is not a full debugging proxy, so live breakpoints and response rewriting are better handled by Fiddler Everywhere, Charles or Proxyman.

Best for: Developers whose main Fiddler use was composing and replaying API requests.

10. Browser DevTools — The Free Network Panel Already Built Into Every Browser

The network panels in Chrome, Edge, Firefox and Safari DevTools show every request a page makes, with headers, timings, payloads and responses, and can throttle connections, block requests and export HAR files. Chrome and Edge also support local overrides for changing responses.

For front-end developers who opened Fiddler mainly to see what a web page was calling, DevTools may already be enough, at no cost and with no proxy or certificate setup.

DevTools only sees its own browser tab, so it cannot capture traffic from desktop apps, services, mobile devices or other browsers.

Best for: Front-end developers checking browser traffic who do not need system-wide capture.

How To Choose A Fiddler Alternative

What Did You Actually Use Fiddler For?

List your Fiddler workflows before you shortlist. Watching and decrypting traffic is covered by every proxy here. Breakpoints and response rewriting point to Fiddler Everywhere, Charles, Proxyman or HTTP Toolkit Pro. FiddlerScript automation points to mitmproxy or Proxyman scripting, and composing API calls points to Postman.

Do You Need To Debug Mobile Devices Or Containers?

Proxyman and Charles are strong for iOS and Android debugging, HTTP Toolkit is quickest for Docker and Android, and mitmproxy runs anywhere you can run Python. Check how each tool installs its root certificate on your target devices, since that step causes most setup problems.

Is Security Testing Part Of The Job?

If you used Fiddler to probe your own applications for weaknesses, a security proxy such as Burp Suite or ZAP will serve you better than a pure debugging tool. For larger engagements, our list of top API penetration testing companies covers firms that do this work professionally.

Which Licensing Model Fits Your Team?

The market spans every model: per-user subscriptions for Fiddler Everywhere and Burp Suite Professional, one-time licenses for Charles and Proxyman Standard, freemium for HTTP Toolkit and Postman, and fully free open source for mitmproxy, ZAP and Wireshark. Price the whole team over three years, and confirm the commercial use terms before you roll anything out, since that is exactly what changed with Fiddler Classic.

Conclusion

For most businesses, Fiddler Everywhere is the lowest-friction replacement for Fiddler Classic, especially now that it imports Classic settings and custom inspectors. Charles and Proxyman are the strongest paid alternatives at a one-time price, HTTP Toolkit and mitmproxy lead the open-source options, and Burp Suite, ZAP, Wireshark, Postman and browser DevTools cover security testing, packet analysis, API work and quick browser checks.

Pick the tool that matches the workflows you rely on, migrate your rules and saved sessions, and remove Fiddler Classic from company machines so you stay within its new license. For the rest of your toolchain, browse our guide to the best .NET developer tools.