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Mockoon

mockoon.com

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Spec score 8.6 #6 of 26 in API Design Tools

What it is

Mockoon is a free, open-source tool for designing and running mock APIs locally. It supports OpenAPI and can fit into existing applications and API design workflows. Mock behavior can use dynamic templating, rule matching, JSON databases, proxy mode, webhooks, and TLS. The tool can record requests and responses from a real API to create mocks, and it supports proxying and integration testing. The open-source version permits unlimited mock APIs and routes, including parallel runs. Its CLI can run mocks in headless automated environments such as CI, GitHub Actions, and Docker; mocks can also run in serverless environments including AWS Lambda and GCP/Firebase Functions. The desktop app stores mocks locally, works offline without an account, and reports that mock content and request data are not sent to Mockoon. Pro adds real-time team collaboration, synchronized mocks, and deployment management on private infrastructure; it can be self-hosted on-premises, in a private cloud, or on isolated or air-gapped networks. Team is listed at €10 a month, billed annually at €120/license/year, tax excluded. Eligible companies can request one 14-day self-hosted Pro trial with five license slots using a verified work email, without a payment method.

Spec sheet

Purpose
Mockoon is a free and open-source tool for designing and running mock APIs locally.Read 4 Oct 2026 · mockoon.com
Platforms
Desktop downloads are listed for Windows, macOS, and Linux, with Linux packages for x86_64 and arm64.Read 4 Oct 2026 · mockoon.com
Privacy
The desktop app stores mocks locally, works offline without an account, and reports no mock content or request data to Mockoon.Read 4 Oct 2026 · mockoon.com
Compliance
Mockoon says it supports customers operating under GDPR, CCPA, the UK Data Protection Act, and PIPEDA.Read 4 Oct 2026 · mockoon.com
Support
Team includes next-business-day email support; Enterprise offers dedicated support with a four-business-hour initial response time.Read 4 Oct 2026 · mockoon.com
Founded
2017Read 28 Sep 2026 · mockoon.com
Maker
Mockoon was created in 2017 by Guillaume, its founder and main maintainer, with help from community contributors.Read 4 Oct 2026 · mockoon.com
API workflow
It supports the OpenAPI specification and is designed to fit existing applications and API design workflows.Read 4 Oct 2026 · mockoon.com
Automation
The CLI can run mocks in headless and automated environments, including CI, GitHub Actions, and Docker containers.Read 4 Oct 2026 · mockoon.com
Mock behaviors
Features include dynamic templating, rule matching, JSON databases, proxy mode, webhooks, and TLS support.Read 4 Oct 2026 · mockoon.com
Open-source limits
The open-source version allows unlimited mock APIs and routes and can run them in parallel.Read 4 Oct 2026 · mockoon.com
Pro collaboration
Mockoon Pro supports real-time team collaboration, synchronized mock APIs, and deployment management on private infrastructure.Read 4 Oct 2026 · mockoon.com
Pro deployment
Mockoon Pro can be self-hosted on-premises, in a private cloud, or on an isolated or air-gapped network.Read 4 Oct 2026 · mockoon.com
Serverless
Mock APIs can run in serverless environments such as AWS Lambda and GCP/Firebase Functions.Read 4 Oct 2026 · mockoon.com
Testing and recording
It can record requests and responses from a real API for auto-mocking, and supports proxying and integration testing.Read 4 Oct 2026 · mockoon.com
Trial eligibility
Eligible companies can request one 14-day self-hosted Pro trial with five license slots using a verified work email, without a payment method.Read 4 Oct 2026 · mockoon.com

Plans and prices

Team plan €10 a month €120/license/year; annual billing; tax excl. €10/license/month · Flexible license slots for users or running mock instances · Self-hosted Read 4 Oct 2026 · mockoon.com
Enterprise plan Priced on request Contact for pricing Large teams and organizations · Optional managed cloud deployment · Custom bandwidth and SLA Read 4 Oct 2026 · mockoon.com

Every Mockoon plan and price →

Strong points and limits

Strong points

  • Open-source version allows unlimited APIs and routes
  • Mocks can run in parallel
  • CLI supports CI, GitHub Actions, and Docker
  • Desktop app works offline without an account
  • Pro supports private and air-gapped deployment

Limits

  • Team costs €10 a month
  • Team billing is annual at €120/license/year

Who it suits

It suits developers and teams building or testing API-dependent applications, including those that need automated mock runs. Teams seeking collaboration and private-infrastructure deployment can consider Pro.

Verdict

Mockoon offers a local, open-source route to API mocks, plus automation and serverless options. Pro is the route for synchronized team work and managed deployment capabilities, while Team pricing is billed annually.

Where Specifiction places it

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