FiddlerCore

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On the record

Client support

The documentation says FiddlerCore supports virtually any client application and most devices through mobile proxy settings.telerik.com · read 8 Oct 2026

Current framework

The latest version targets .NET Standard 2.1; support for .NET Framework 4.8 and earlier is available only in older versions.telerik.com · read 8 Oct 2026

Downloads

With an active trial or developer license, users can download standalone installation files, assemblies, NuGet packages, and old versions.telerik.com · read 8 Oct 2026

Import and export

The product page lists importing and exporting traffic to various formats as a key feature.telerik.com · read 8 Oct 2026

Integrations

The product page lists integration with Telerik Fiddler and Telerik TestStudio.telerik.com · read 8 Oct 2026

Monitoring use

The product page describes using FiddlerCore to monitor network systems, devices, and applications and identify delays, missing services, or potential dangers.telerik.com · read 8 Oct 2026

Older framework limit

FiddlerCore 6.x is incompatible with .NET Framework; the system requirements page specifies FiddlerCore 5.0.2 or older for .NET Framework 4.8.telerik.com · read 8 Oct 2026

Testing use

FiddlerCore can replace frontend and backend services, replicate APIs, modify responses, and simulate network conditions and user loads for testing.telerik.com · read 8 Oct 2026

Traffic tools

Its features include HTTP/HTTPS capture and modification, content filtering, and storing and reloading web traffic.telerik.com · read 8 Oct 2026

Trial limits

The 30-day trial does not allow integration into end products or commercial, productive, training, or redistribution use.telerik.com · read 8 Oct 2026

Trial support

The license agreement says trial users can submit support requests with a 72-hour response time, excluding Saturdays, Sundays, and holidays, for 30 days after their initial trial download.telerik.com · read 8 Oct 2026

What it is

FiddlerCore is a .NET class library that can be integrated into .NET applications to capture and modify HTTP and HTTPS traffic without the Fiddler user interface.telerik.com · read 8 Oct 2026

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