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Yaak vs Apollo Sandbox: catalog facts
Yaak	Apollo Sandbox
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Sandbox is free to use.
Windows, macOS, Linux	Web
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	Nothing to install, runs in the browser Works against any GraphQL endpoint
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	GraphQL only Proprietary and tied to Apollo's hosted service
Downloadable app	Web application
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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