The best alternative to Insomnia REST Client is HTTP Toolkit, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Insomnia REST Client and 11 are so hopefully you can find a suitable replacement. Other interesting alternatives to Insomnia REST Client are Roster HTTP Client, Advanced REST Client, Voiden.md and Treblle.
HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools and automatic interception for clients from Docker to Android to iOS.
HTTP client for GNOME featuring GTK 4 UI, organized project management, request history, secure environment variables, JavaScript scripts for preprocessing, export in cURL and more formats, syntax-highlighted response viewing, and advanced request customization.
API testing tool. Which allows web developers to create and test custom HTTP requests.
Voiden.md is an offline-first, Git-native API workspace that unifies specs, docs, tests, and mocks using programmable Markdown blocks. Build APIs the way you actually work.
Treblle is a federated API Intelligence platform delivering full API visibility, security, and control from one integration point.
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...
Hurl is a command line tool that runs HTTP requests defined in a simple plain text format. It can capture values, evaluate queries on headers and body response. It is very versatile: it can be used for both fetching data and testing HTTP sessions.
Bearer is a developer tool that helps engineering teams monitor API requests, track performance, detect anomalies, and fix issues for their critical API usage. The solution monitors all outgoing API requests without proxying traffic.
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.
Ain is a command-line HTTP API client. It's an alternative to postman, paw or insomnia. It enables scripting of input and further processing of output. It targets command-line users who work with API:s using a simple file format.
Slingshot is a web-based HTTP request client that is highly performant, low on resources, privacy respecting, local-first, free and open-source. It stores all your data locally in your browser. It allows you to import and export OpenAPI specs and Postman collections.
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