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Yaak vs Thunder Client: catalog facts
Yaak	Thunder Client
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Freemium A free tier is available. Paid licences add team and advanced features.
Windows, macOS, Linux	Windows, macOS, Linux
Requests are stored as files on your machine, so a git repository is the shared collection REST, GraphQL, gRPC, WebSocket and Server-Sent Events in one client	Runs inside the editor, so no second application to switch to Collections stored as repository files instead of a cloud account
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	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: MIT	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.