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ATAC vs Resterm: catalog facts
ATAC	Resterm
Free Free and open source under the MIT licence.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux, Command line	Windows, Linux, Command line
Full API client inside the terminal Optional Vim key bindings	Plain .http files that fit into git Covers HTTP, GraphQL, gRPC, WebSocket and SSE
Still working toward its 1.0 release No graphical interface for people who prefer a mouse	Terminal interface only, no graphical app Many features to learn compared with a simple request tool
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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