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Insomnium

github.com

Free plan WindowsmacOSLinuxSelf-hosted
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Spec score 8.2 #21 of 38 in API clients

Spec sheet

What it does
Insomnium is a local API client for testing GraphQL, REST, WebSockets, server-sent events, and gRPC.Read 9 Oct 2026 · github.com
Intended users
The README describes Insomnium as a tool for API testing in development and production.Read 9 Oct 2026 · github.com
Available platforms
desktopRead 20 Sep 2026 · github.com
Free plan
YesRead 20 Sep 2026 · github.com
Authentication
Requests can use metadata and chained authentication strategies, including Bearer, Basic, and GCP ID Token.Read 9 Oct 2026 · github.com
Automation integration
An optional MCP server lets MCP-aware tools list, inspect, create, update, delete, and run saved requests programmatically.Read 9 Oct 2026 · github.com
Desktop downloads
Downloads are offered for macOS, Windows, Ubuntu, Debian, CentOS, and Fedora; the README points Arch users to AppImage or tar.gz releases.Read 9 Oct 2026 · github.com
Distribution
The README documents macOS installation through Homebrew and Debian or Ubuntu installation through an APT repository.Read 9 Oct 2026 · github.com
GraphQL support
YesRead 20 Sep 2026 · github.com
gRPC
The gRPC client supports unary, server-streaming, client-streaming, and bidirectional streaming, plus .proto imports and server reflection.Read 9 Oct 2026 · github.com
gRPC support
YesRead 20 Sep 2026 · github.com
MCP security
The MCP server is disabled by default, binds to loopback, requires a Bearer token, and uses SSE over HTTP.Read 9 Oct 2026 · github.com
Offline use
The project says the app works 100% offline and has no cloud services, tracking, analytics, or background communication to external servers.Read 9 Oct 2026 · github.com
Open source
Insomnium is open source under the MIT license.Read 9 Oct 2026 · github.com
Project origin
Insomnium is a fork of Kong/Insomnia at version 2023.5.8, which the README describes as the last commit before compulsory account login was introduced.Read 9 Oct 2026 · github.com
Security maintenance
The project reports dependency security updates, Electron and native-module refreshes, application security fixes, and CI hardening.Read 9 Oct 2026 · github.com
Source build
The project says users can build Insomnium locally with npm run app-package.Read 9 Oct 2026 · github.com
Support and contributions
The maintainer welcomes issues and pull requests, and the repository provides contributing guidelines and an issue-guidelines link.Read 9 Oct 2026 · github.com
WebSocket support
YesRead 20 Sep 2026 · github.com

Plans and prices

Insomnium Free Open-source API client · 100% local Read 9 Oct 2026 · github.com

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