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Cartero vs Resonance: catalog facts
Cartero	Resonance
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the MIT licence.
Linux	Linux
Native and lightweight, not a web app No account or cloud subscription required	No account, cloud sync or telemetry Collections stored as plain YAML files
Fewer features than large API platforms Linux is the platform confirmed in the research	Younger and smaller than Postman or Insomnia No built-in sync for sharing collections across a team
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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