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Voiden vs Insomnia: catalog facts
Voiden	Insomnia
Free Free and open source.	Freemium Free to use, with a free account unlocking most features. Kong sells paid plans for teams…
Windows, macOS, Linux	Windows, macOS, Linux
Requests and docs stored as plain Markdown files in Git Works offline with no account or cloud	REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client Local Vault and Git Sync mean the cloud is optional
Uses its own .void file format Younger project than established API clients	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 not stated	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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