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Insomnia vs TestMace: catalog facts
Insomnia	TestMace
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Distributed as freeware.
Windows, macOS, Linux	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	Graphical test editor alongside JavaScript tests Variables, authentication and API import
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	Closed source The site gives no release dates or changelog
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License: Freeware
No account needed	Not stated if an account is 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 October 2, 2026

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