Windows RestClient Alternatives & Competitors

Nightingale is a fast, resource-efficient, and full-fledged REST API client for Windows 10.

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.

Key Insomnia REST features:

User-Friendly Interface Support for Multiple Protocols Environment Management Custom Plugins and Themes

Open Source

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Key Flagsmith features:

Feature Flags Remote Config A/B/X Testing & Optimization Organization Management

Try for free Open Source freemium

SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.

Key soapUI features:

Comprehensive Testing User-Friendly Interface Extensive Protocol Support Scripting Capability

HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and...

Open Source

The Collaboration Platform for API Development.

Key Postman features:

User-Friendly Interface Collaboration Comprehensive Testing Tools Extensive API Documentation

Open Source

cURL is a computer software project providing a library and command-line tool for transferring data...

Key cURL features:

Versatility Cross-Platform Command-Line Usage Automation

Open Source

An online, open source API request builder.

Key Postwoman features:

Open Source User-Friendly Interface Lightweight Real-time WebSocket Testing

Open Source

Paw is a REST client for Mac.

Key RapidAPI for Mac features:

User Interface Team Collaboration Advanced Request Capabilities Extensions and Plugins

Open source API development ecosystem.

Key Hoppscotch features:

User-Friendly Interface Open Source Multi-Platform Support Real-Time Collaboration

Open Source freemium

Developers all around the world rely on HTTPie for API testing.

Key HTTPie for Terminal features:

User-Friendly Syntax JSON Support Headers and Options Simplification Built-in Authentication

API test automation tool that has GUI, supports HTTP stubs (mock services), data driven testing...

A REST client for almost any web service (Firefox and Chrome extension).

RESTClient can be used to test variety of HTTP communications and RESTful webservices.

Key RESTClient features:

User-Friendly Interface Support for Multiple HTTP Methods Customizable Headers and Body Open Source