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

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