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Yaak vs Testfully: catalog facts
Yaak	Testfully
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Freemium Free to start with offline use; paid and enterprise plans available.
Windows, macOS, Linux	Web, Browser extension
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	Choice of local offline storage or cloud sync Imports from Postman and Insomnia
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Proprietary Team and monitoring features are aimed at paid plans
Downloadable app	Downloadable app, Web application, Browser extension
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
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.