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Hoppscotch vs ATAC: catalog facts
Hoppscotch	ATAC
Freemium Free and open source under the MIT licence, including self-hosting. A paid cloud plan…	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Web, Self-hosted, Browser extension	Windows, macOS, Linux, Command line
Opens in a browser tab with nothing to install HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT	Full API client inside the terminal Optional Vim key bindings
The browser version needs an extension or the desktop app to reach local services Team collaboration features are the paid part	Still working toward its 1.0 release No graphical interface for people who prefer a mouse
Web application, Downloadable app, Self-hosted, Browser extension	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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