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Scalar API Client vs Insomnia: catalog facts
Scalar API Client	Insomnia
Freemium The open-source client is free; the wider Scalar platform has commercial offerings.	Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…
Web	Windows, macOS, Linux
Understands OpenAPI descriptions Open source on GitHub	REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional
The website focuses on the commercial docs and SDK platform rather than the client Most useful when an OpenAPI description exists	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
Web application	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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