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Insomnia vs Thunder Client: catalog facts
Insomnia	Thunder Client
Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…	Freemium A free tier is available. Paid licences add team and advanced features.
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	Runs inside the editor, so no second application to switch to Collections stored as repository files instead of a cloud account
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	Team features and some collection capabilities require a paid licence Tied to VS Code and JetBrains editors
Downloadable app	Downloadable app
Open source	Closed 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 22, 2026

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