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Hello HTTP vs Yaak: catalog facts
Hello HTTP	Yaak
Free Free and open source under the Apache 2.0 licence.	Freemium Yaak is MIT licensed and free to build and use. Development is funded by…
Windows, macOS, Linux	Windows, macOS, Linux
Supports HTTP, WebSocket, GraphQL subscriptions and gRPC Desktop app rather than a cloud service	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
Built mainly around one developer's needs Smaller ecosystem than Postman or Insomnia	A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: MIT
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 October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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