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grpcui vs Insomnia: catalog facts
grpcui	Insomnia
Free Free and open source under the MIT licence.	Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…
Web, Command line	Windows, macOS, Linux
Browser forms for calling gRPC methods Postman-style workflow for gRPC rather than REST	REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional
Covers gRPC only, not REST or GraphQL Launched from the command line rather than as a desktop app	Most features expect an account, even though a Scratch Pad works without one The 2023 move to account-first storage cost it a lot of goodwill
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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