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Hoppscotch vs Cartero: catalog facts
Hoppscotch	Cartero
Freemium Free and open source under the MIT licence, including self-hosting. A paid cloud plan…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Web, Self-hosted, Browser extension	Linux
Opens in a browser tab with nothing to install HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT	Native and lightweight, not a web app No account or cloud subscription required
The browser version needs an extension or the desktop app to reach local services Team collaboration features are the paid part	Fewer features than large API platforms Linux is the platform confirmed in the research
Web application, Downloadable app, Self-hosted, Browser extension	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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