Mockoon was created in 2017 by French developer Guillaume Monnet and is developed by his independent, unfunded company 1kB SARL-S, based in Luxembourg City. The core application remains free and open source under the MIT license.
Built with Electron, Mockoon runs as a cross-platform desktop app on Windows, macOS, and Linux, letting developers design and run mock REST API servers locally in seconds with no account or remote deployment required.
Key Features
Mockoon lets developers visually define routes, HTTP methods, status codes, headers, and static or dynamically templated response bodies, then serve them from a local mock server. A CLI and Docker image extend this to CI/CD pipelines and headless environments.
The optional Mockoon Cloud layer adds real-time team collaboration, data synchronization across devices, one-click cloud deployment of mocks to a shareable URL, and an AI assistant that can generate realistic mock data and endpoints from natural-language prompts.
Pricing
The Mockoon desktop application, CLI, and Docker image are completely free with no account requirement or feature limits, covering the needs of most individual developers.
Mockoon Cloud adds paid tiers for teams: a Solo plan around 15 dollars per month, a Team plan around 100 dollars per month billed annually for up to 5 members, and a custom-priced Enterprise plan with dedicated instances and guaranteed SLAs.
Key Features
Local Mock REST API Server — Runs realistic mock API servers on a developer's own machine with no account or remote deployment required.
Visual Route and Response Editor — Desktop GUI for defining routes, methods, status codes, headers, and response bodies.
CLI for CI/CD Mocking — Runs Mockoon mocks headlessly, integrating easily into automated testing and CI/CD pipelines.
Docker Image Support — Official Docker image lets teams run Mockoon mocks inside containerized environments.
Dynamic Templated Responses — Generates realistic dynamic response data using templating rather than only static payloads.
Mockoon Cloud Team Collaboration — Paid Cloud tier enables real-time collaboration and data sync on mock definitions across a team.
One-Click Cloud Deployment — Deploys mocks to the cloud with a shareable URL for teams that need access beyond a single machine.
AI Assistant for Mock Generation — Generates realistic mock data and endpoints from natural-language prompts within Mockoon Cloud.
Pros & Cons
Pros
Free, open-source core with no account or sign-up required to start mocking locally
Fast setup; mock APIs can be running within seconds via a desktop GUI
CLI and Docker support make it easy to integrate into CI/CD pipelines
Cross-platform support for Windows, macOS, and Linux via Electron
Optional Cloud tier adds team collaboration and shared deployments without forcing all users onto a paid plan
Cons
Cloud plans are required for team collaboration and shared or public mock deployment, adding cost for teams
Electron-based desktop app has a larger footprint than lightweight CLI-only tools like JSON Server
Enterprise-grade governance features require the custom-priced Enterprise plan
Smaller ecosystem and marketplace than Postman, which bundles mocking with a much larger API platform
Name similarity to the unrelated MockServer project can cause confusion when searching for support or resources
Pricing
Free (Desktop/CLI) $0 N/A
Solo (Cloud) $15/month Monthly
Team (Cloud) $100/month billed annually Annual
Enterprise (Cloud) Custom Custom
Frequently Asked Questions
Is Mockoon free?
Yes, the Mockoon desktop app, CLI, and Docker image are free and open source under the MIT license.
Who created Mockoon?
Mockoon was created in 2017 by French developer Guillaume Monnet, developed by his company 1kB SARL-S in Luxembourg.
Do I need an account to use Mockoon?
No, the local desktop application and CLI require no account or sign-up to use.
What is Mockoon Cloud?
Mockoon Cloud is a paid add-on offering team collaboration, data sync, cloud deployment, and an AI assistant for mock generation.
Does Mockoon have a CLI?
Yes, Mockoon ships a CLI for running mocks headlessly, useful for CI/CD pipelines and Docker containers.
Is Mockoon the same as MockServer?
No, Mockoon and MockServer are distinct, unrelated projects despite the similar name.