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Fiddler Classic vs HTTP Toolkit: catalog facts
Fiddler Classic	HTTP Toolkit
Free Free for eligible non-commercial use; commercial use points to the paid Fiddler…	Free Open-source desktop app that is free to download.
Windows	Windows, macOS, Linux
Captures and decrypts HTTPS traffic for inspection Lets you modify requests and responses	One-click interception for many tools and platforms Can target traffic from a single client
Licensed only for eligible non-commercial use Windows only	Desktop only; no mobile app to run it on a phone Aimed at developers rather than general users
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.