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Insomnia vs websocat: catalog facts
Insomnia	websocat
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Free and open source.
Windows, macOS, Linux	Command line
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Quick interactive testing of WebSocket endpoints Works in pipes and shell scripts
Most features expect an account, even though a Scratch Pad works without one The 2023 move to account-first storage cost it a lot of goodwill	Command line only Advanced options take time to learn
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
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.