API testing tool. Which allows web developers to create and test custom HTTP requests.
Platforms
- Mac
- Windows
- Linux
- Chrome OS
- AppImageHub
- Google Chrome
- Chromium
Poland
EU
Insomnium Alternatives
Insomnium is described as 'Fast local API testing tool that is privacy-focused and 100% local. For testing GraphQL, REST, WebSockets and gRPC. This is a fork of Kong/insomnia' and is a API Client in the development category. There are more than 25 alternatives to Insomnium for a variety of platforms, including Linux, Mac, Windows, Flathub and Flatpak apps. The best Insomnium alternative is Bruno, which is both free and Open Source. Other great apps like Insomnium are Postman, Insomnia REST Client, Yaak and Hoppscotch.
Alternatives list
- 78 Advanced REST Client alternatives
HarborClient is a free, open-source desktop API client for macOS, Windows, and Linux. It gives you a familiar Postman-style workspace—collections, environments, request scripts, and a tabbed editor—while keeping your work on your machine or on storage you control.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Windows
- Mac
- Linux
United States
Cartero is a graphical HTTP client that can be used as a developer tool to test web APIs and perform all kind of HTTP requests to web servers. It is compatible with any REST, SOAP or XML-RPC API and it supports multiple request methods as well as attaching body payloads to...
Cost / License
- Free
- Open Source (GPL-3.0)
Application type
Platforms
- Linux
- Windows
- Flathub
- Flatpak
- Nix Package Manager
- Mac
Spain- EU
Upcoming API testing tool in beta, built in GoLang, supporting HTTP/gRPC, workspaces, environments, request management, and various content types. Features include dark mode, local data storage, Postman import, environment variable setting, and request chaining.
Cost / License
- Free
- Open Source (BSD-3-Clause)
Application typeApplication types
Platforms
- Mac
- Linux
+4
Build, test, and debug your APIs with a self-hosted tool that does what you actually need. Scripts, environments, OAuth 2.0, code generation, and an AI wizard that builds collections from your docs — no account required, no limits.
Cost / License
- Free
- Open Source (MIT)
Platforms
- Windows
- Docker
- Self-Hosted
Hungary- EU
+1
Zaku is a native Rust, local-first, open-source API client engineered for speed and productivity.
Cost / License
- Free
- Open Source (AGPL-3.0)
Application type
Platforms
- Mac
- Windows
- Linux
A cross-platform HTTP client desktop application for testing HTTP and REST APIs, WebSocket, GraphQL (including subscriptions) and gRPC endpoints.
Cost / License
- Free
- Open Source (Apache-2.0)
Application type
Platforms
- Mac
- Windows
- Linux
Cost / License
- Free
- Open Source (Apache-2.0)
Application typeApplication types
Platforms
- Python
- BSD
- Linux
- Mac
- Windows
P
All the user-friendliness of our Terminal version, now wrapped up in a sleek graphical interface.
Cost / License
- Free
- Proprietary
Application typeApplication types
Platforms
- Mac
- Windows
- Linux
- Online
- Electron / Atom Shell
- Flathub
- United States
Native API client for Windows & Linux — collections, environments, OpenAPI import, Git sync, request chaining, and response testing.
Cost / License
- Freemium
- Proprietary
Application typeApplication types
Platforms
- Windows
- Linux
Germany- EU
+4
Cost / License
- Free
- Proprietary
Application typeApplication types
Platforms
- Mac
RequesterX is a free desktop HTTP client for API testing and development. Organize requests into nested collections, use environment variables for easy context switching, generate code snippets in 13 languages, and keep everything stored locally — no account required.
Cost / License
- Free
- Proprietary
Application typeApplication types
Platforms
- Mac
- Windows
South Korea
