Postman

Postman (postman.com) is a comprehensive API platform that goes beyond mocking, offering a full suite for API development, testing, and monitoring. With its mock server feature, Postman enables teams to simulate responses for various endpoints, making it a popular choice for end-to-end API management.

Key Features:

• Shareable documentation & API collections for teams and stakeholders.

• Quickly create mock servers to simulate endpoint responses.

• Enterprise standard solution and use by millions of users

Best for: Large businesses with multiple teams and developers with more focus on documentation & API contracts.

Pricing: Free tier available; A bit costly for bigger teams.

WireMock

WireMock is a versatile, open-source platform for API mocking, offering powerful simulation features for both HTTP and HTTPS protocols. It’s highly customizable and is especially well-suited for complex use cases, such as testing microservices architectures and handling advanced behaviors.

Key Features:

• Tailor responses and request matching to fit intricate testing scenarios.

• Mock both HTTP and HTTPS requests, including request matching and dynamic responses.

• Define mocks that change based on request sequences or state.

Best for: Medium to large businesses with multiple developers. It's takes a little bit to time to setup but pays off in the long run.

Pricing: Free (open-source); enterprise version available with additional features.

Mockpi

Mockpi (mockpi.co) is a powerful API mocking framework designed to handle everything from simple mocks to complex, stateful simulations. Its zero-code integration allows users to create API mocks and start using them immediately by updating the base URL, making it an easy fit within existing workflows.

It is purely focussed on creating API mocks using developer friendly tools like Postman, Curl etc.

Key Features:

• Zero code integration — just switch the base URL to mockpi, and your mocks are ready to use.

• Simulate custom API behaviors like different HTTP codes with different response bodies, delays, conditions etc that change based on input or weight or pattern match.

• Extensive Documentation to help users make the most of mockpi’s features.

Best for: Ideal for startups to large businesses, this tool is quick and easy to set up, focusing specifically on API mocks and simulations. However, you’ll need to use platforms like Postman or the Mockpi website to manage your mocks and teams effectively.

Pricing: Free trial for a month; Paid plans with advanced features for startup & large businesses.

Beeceptor

Beeceptor is a cloud-based API mocking platform that enables users to create mocks with minimal setup. Designed for speed and simplicity, Beeceptor is especially popular for rapid prototyping and testing in real time.

Key Features:

• Control access to mocks based on project requirements.

• Inspect incoming requests to verify the accuracy of mock configurations.

• Instantly create and use mocks with very less code changes.

Best for: Quick prototyping, frontend developers, and users looking for a straightforward, cloud-based solution.

Pricing: Free tier available; paid plans with advanced features.

Smartmock

Smartmock is a desktop-based API mocking tool with an intuitive user interface that simplifies mock setup. Its offline capabilities make it a solid choice for teams that need quick access to mocks without relying on an internet connection.

Key Features:

• Static, Template, and Dynamic Responses

• Import from OpenAPI/Swagger

• Teams and Collaboration

Best for: Quick frontend developers and users looking for a simple API mocking tool.

Pricing: Free tier available; paid plans with advanced features.

We’d love to hear your thoughts! Have you used any of these tools, or do you have a favorite API mocking tool that didn’t make our list? Share your feedback, suggestions, and experiences in the comments below. Let us know what you think and which tool has been the most effective for your API mocking needs!