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Insomnia vs Postman: catalog facts
Insomnia	Postman
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Freemium A free tier covers individual use with limits on collaborators, collection runs and…
Windows, macOS, Linux	Windows, macOS, Linux, Web, Browser extension
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	The most widely used API client, so collections and tutorials for it are everywhere Collections with environments, pre-request and test scripts, and a built-in runner
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	Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions
Downloadable app	Downloadable app, Web application, Browser extension
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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