Restlet Studio Alternatives & Competitors

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

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

The all-in-one Screenshot API for developers: capture websites, generate PDFs, record videos, and automate it all with powerful, scalable infrastructure. No browser setup, no hassle. Just clean results, fast.

Key ScreenshotMAX features:

Annoyance Blocking Scheduled Screenshot Tasks Full-Page Screenshot Rendering HTML to PDF Conversion

Try for free freemium $19.0 / Monthly

The Collaboration Platform for API Development.

Key Postman features:

User-Friendly Interface Collaboration Comprehensive Testing Tools Extensive API Documentation

Open Source

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

CLI HTTP that will make you smile. JSON support, syntax highlighting, wget-like downloads, extensions, and more.

Key HTTPie features:

User-Friendly Syntax JSON Support Cross-Platform Plugin Support

Open Source

Open source API development ecosystem.

Key Hoppscotch features:

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

Open Source freemium

Milkman is a JavaFx-based workbench for crafting requests / responses. It is not limited to e.g. http (or more specifically rest) requests but can be extended in any imaginable way. It is optimized for fast startup and efficient workflow.

Key Milkman features:

User-Friendliness Extensibility Multi-Protocol Support Open Source

Powerful IDE to work with API.

Key TestMace features:

User-Friendly Interface Comprehensive Testing Features Cross-Platform Compatibility Collaboration Tools

All-in-One workspace for API Design, Documentation, Debug, Mock, Test.

Key Apidog features:

User-Friendly Interface Comprehensive API Management Collaboration Features Integration Capabilities

freemium $9.0 / Monthly

Rest API client for VS Code, lightweight Postman alternative.

Key Thunder Client features:

User-Friendly Interface VS Code Integration Lightweight Environment Variables

Swagger UI is a dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation from a Swag.

Key Swagger UI features:

Interactive API Documentation Automated Documentation Generation Standardization Comprehensive Testing

Web-services testing made simple 🥋.

Key Karate features:

Ease of Use Integration of API and UI Testing Built-in Assertions Support for Data-Driven Testing

API testing cloud service.

Key RakAPIt features:

User Friendly Interface Comprehensive Documentation Scalability Robust Security Features