Apps similar to Mockoon include apimock-rs (API Mock), which is free and open source. Other options are Reqable, WireMock, Beeceptor and mockd. You can choose from more than 10 API Clients like Mockoon for the web, Mac, Windows, Linux and self-hosting.
apimock-rs (API Mock) is a developer-friendly, super-lightweight and functional HTTP(S) mock server built in Rust. It provides file-based mechanism for mocking RESTful APIs using static JSON responses. Optionally, dynamic routing is supported: rule-based matching via toml and...
Reqable is a modern cross-platform project, designed for API development, testing, and debugging. Reqable fully supports HTTP1 and HTTP2 and partially supports HTTP3(QUIC).
WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server.
Build a mock Rest API endpoint in seconds. Helps you in UI development, Webhooks, simulating delays, simulating exceptions and server errors, performance test, etc.
Multi-protocol mock server for HTTP, gRPC, GraphQL, WebSocket, MQTT, SSE, and SOAP. One Go binary, zero dependencies. Supports stateful CRUD, digital twins (passes real SDK tests), chaos engineering, OpenAPI/Postman/HAR/cURL import, and a built-in MCP server for AI agents.
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MockServer can be used for mocking any system you integrate with via HTTP or HTTPS (i.e. services, web sites, etc).
SOAP/REST Mock Service is a simple configurable framework to mock out SOAP or RESTful (or "REST-like") webservices. It's main goal is to support automated integration testing of applications that integrate with 3rd party webservices.
Mockintosh is a mock server generator that's capable to generate RESTful APIs or communicate with message queues to mimick asyncronous tasks. Such that it enables software development teams to work independently while building and maintaining a complicated microservice...
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MockBolt lets you paste any JSON and instantly get a live mock HTTP endpoint — no signup, no install, no CLI.
Online API Mocking Tool: API Mock, fake API, stub API, simulate API, dummy API. Capture and debug requests instantly. Forward requests to localhost for webhooks testing and debugging. More than 100 random or faker shortcodes for response templating.
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