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RestermATAC
Free

Free and open source under the Apache 2.0 licence.

 Free

Free and open source under the MIT licence.

Windows, Linux, Command line Windows, macOS, Linux, Command line
  • Plain .http files that fit into git
  • Covers HTTP, GraphQL, gRPC, WebSocket and SSE
  • Full API client inside the terminal
  • Optional Vim key bindings
  • Terminal interface only, no graphical app
  • Many features to learn compared with a simple request tool
  • Still working toward its 1.0 release
  • No graphical interface for people who prefer a mouse
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: MIT
No account needed No account needed
Works offline Not stated if it works offline

Checked October 2, 2026

Checked September 23, 2026

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