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Insomnia vs Scalar API Client: catalog facts
Insomnia	Scalar API Client
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Freemium The open-source client is free; the wider Scalar platform has commercial offerings.
Windows, macOS, Linux	Web
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Understands OpenAPI descriptions Open source on GitHub
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	The website focuses on the commercial docs and SDK platform rather than the client Most useful when an OpenAPI description exists
Downloadable app	Web application
Open source	Open source
License: Apache-2.0	License not stated
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 September 23, 2026

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