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Testfully vs Yaak: catalog facts
Testfully	Yaak
Freemium Free to start with offline use; paid and enterprise plans available.	Freemium Yaak is MIT licensed and free to build and use. Development is funded by…
Web, Browser extension	Windows, macOS, Linux
Choice of local offline storage or cloud sync Imports from Postman and Insomnia	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
Proprietary Team and monitoring features are aimed at paid plans	A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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