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Fiddler Classic vs Rockxy: catalog facts
Fiddler Classic	Rockxy
Free Free for eligible non-commercial use; commercial use points to the paid Fiddler…	Free Free and open source under the AGPL.
Windows	macOS
Captures and decrypts HTTPS traffic for inspection Lets you modify requests and responses	Native Mac app for Apple Silicon and Intel Breakpoints, map local and remote, and request replay
Licensed only for eligible non-commercial use Windows only	macOS only, requires macOS 14 or newer HTTPS inspection requires installing and trusting a certificate
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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