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
Hosted mock API generator with conditional matching, stateful CRUD, chaos injection, and a live WebSocket request inspector. No signup required to start.
Cost / License
- Free
- Proprietary
Platforms
- Online
Czechia
EU


+2
Free desktop API mocking platform. Create HTTP/REST and WebSocket mock servers with a modern UI. Perfect for developers, QA teams, and trainers.
Cost / License
- Free
- Proprietary
Platforms
- Mac
- Windows
- Linux
- Global

DevConverter is an online file converter with API and much more. We support nearly all audio, video, document, ebook, archive, image, spreadsheet, and presentation formats.
Cost / License
- Freemium
- Proprietary
Application typeApplication types
Platforms
- Online
- Software as a Service (SaaS)


+1
AI-powered VS Code extension that generates OpenAPI specs from prompts, validates and lints contracts, runs security analysis, creates mock APIs & auto-generates documentation for faster integrations.
Cost / License
- Freemium
- Proprietary
Platforms
- Visual Studio Code

Free browser-based OpenAPI editor from Postman. Design or import a Swagger 2.0, OpenAPI 3.0, or OpenAPI 3.1 spec (YAML or JSON) and see live documentation with inline validation as you type. No signup, no install. Part of Postman's suite of free developer tools at postman.
Cost / License
- Free
- Proprietary
Platforms
- Online
United States



The apicurio studio project is a standalone, self-hostable, web-based API design studio that can be used to create new or edit existing API designs (using the OpenAPI specification).
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Online
- Self-Hosted
United States


The API documentation tool that creates interactive REST API documentation and developer portals in minutes. Auto-generate from OpenAPI & Swagger specs—no coding required.
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Online
- Global






























