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Insomnia vs SoapUI Open Source: catalog facts
Insomnia	SoapUI Open Source
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Free The open source edition is free; the commercial ReadyAPI product is paid.
Windows, macOS, Linux	Windows, macOS, Linux
REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional	Strong SOAP and WSDL support Functional test suites with custom scripting
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	GraphQL, gRPC and CI integrations are reserved for paid ReadyAPI Website heavily promotes the commercial product
Downloadable app	Downloadable app
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.