Does GraphDagger have an AutoResponder equivalent?

Yes. Map Local serves files from disk in place of live responses, Map Remote redirects requests to another host, and the match and replace rule engine handles URL, header and body rewrites for everything in between.

What replaces FiddlerScript?

A JavaScript scripting engine that runs against live traffic. Rules that needed JScript.NET in Fiddler become plain JavaScript, the language most teams already maintain.

Does it run on macOS?

Yes, natively. GraphDagger ships signed builds for macOS (Apple Silicon and Intel) and Windows (x64 and Arm64), and the Web Debugger behaves identically on both.

Can I bring my archived Fiddler sessions?

Export them as HAR and open them in GraphDagger. HAR import and export is built in; the proprietary SAZ format is not read directly.

Is there a free trial?

Yes, 14 days with every tool unlocked. Checkout starts the trial, nothing is charged while it runs, and cancelling before day 14 costs nothing.

A Fiddler alternative that works the same on macOS and Windows

GraphDagger's Web Debugger gives you Fiddler's core, HTTPS inspection, breakpoints, AutoResponder-style mapping and scripting, as one native app that behaves identically on both platforms.

Start the 14-day free trial See pricing

Fiddler Classic is a Windows institution: free, scriptable and everywhere .NET developers work. It is also Windows-only, and its successor moved the workflow to a subscription with a different feature set, which is exactly the moment teams re-evaluate.

GraphDagger's Web Debugger is a full replacement. Live HTTP and HTTPS capture with full request and response inspection, request and response breakpoints, Map Local and Map Remote in place of AutoResponder rules, a rule engine with a dedicated DSL, and a JavaScript scripting engine where FiddlerScript would have been. HTTP/2, WebSocket, gRPC and SSE are inspected natively, and sessions move in and out as HAR.

GraphDagger vs Fiddler, feature by feature

Capability	Fiddler	GraphDagger
Platforms	Fiddler Classic is Windows-only	One native app for macOS and Windows, identical on both
HTTPS decryption	HTTPS decryption via a root certificate	HTTPS interception with a generated CA and guided setup
Auto-responses	AutoResponder rules	Map Local and Map Remote, plus match and replace rules with a dedicated DSL
Scripting	FiddlerScript in JScript.NET	A JavaScript scripting engine, the language your team already writes
Breakpoints	Request and response breakpoints	Breakpoints to pause, edit and drop requests and responses
Modern protocols	HTTP/2 and WebSocket support varies by edition	HTTP/2, WebSocket, gRPC and SSE inspection built in
Session portability	SAZ archives, HAR export	HAR import and export plus CSV, so archived sessions carry over

GraphDagger Web Debugger rule editor with match conditions and actions — Match and replace rules stand in for AutoResponder.

GraphDagger Web Debugger Composer rebuilding a captured request — Rebuild a captured request in the Composer and send it again.

Explore the full tool: Web Debugger in GraphDagger

Fiddler exports captures as HAR alongside its native .saz format. Open it in the free HAR viewer, straight in your browser.

More than a Fiddler replacement

Fiddler shows you the traffic. GraphDagger keeps the rest of the investigation in the same window: the API you want to hit again, the token inside the Authorization header, the server logs that explain the 500.

API Client with imports for Postman, OpenAPI, cURL and HAR
Auth Inspector for JWTs, SAML and certificates, decoded locally
Log Explorer to query the server side of the story
Recorded traffic renders as a live call graph
One licence, 14 tools, on both platforms your team actually uses

When to stay with Fiddler

Fiddler Classic remains free, and if your team is Windows-only with years of FiddlerScript automation, migrating that investment has a real cost. Deep .NET-specific integrations are its home turf. If that is your daily reality, keep it; GraphDagger earns its place the day someone on the team opens a MacBook.

How the licence compares

Fiddler Classic is free on Windows; its cross-platform successor is sold as a subscription per user. GraphDagger is also a subscription, but one licence covers the debugger and 13 other tools, on macOS and Windows alike.

Frequently asked questions

Does GraphDagger have an AutoResponder equivalent?: Yes. Map Local serves files from disk in place of live responses, Map Remote redirects requests to another host, and the match and replace rule engine handles URL, header and body rewrites for everything in between.
What replaces FiddlerScript?: A JavaScript scripting engine that runs against live traffic. Rules that needed JScript.NET in Fiddler become plain JavaScript, the language most teams already maintain.
Does it run on macOS?: Yes, natively. GraphDagger ships signed builds for macOS (Apple Silicon and Intel) and Windows (x64 and Arm64), and the Web Debugger behaves identically on both.
Can I bring my archived Fiddler sessions?: Export them as HAR and open them in GraphDagger. HAR import and export is built in; the proprietary SAZ format is not read directly.
Is there a free trial?: Yes, 14 days with every tool unlocked. Checkout starts the trial, nothing is charged while it runs, and cancelling before day 14 costs nothing.

Related comparisons

One debugger for the whole team

Start the 14-day free trial and run the same debugger on every machine, Windows and macOS alike. Nothing is charged during the trial.

Start the 14-day free trial See pricing