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