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Insomnia vs Resonance: catalog facts
Insomnia	Resonance
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Linux
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	No account, cloud sync or telemetry Collections stored as plain YAML files
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	Younger and smaller than Postman or Insomnia No built-in sync for sharing collections across a team
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
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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