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What is Hoverfly?

Hoverfly is a lightweight, open source API simulation tool. Using Hoverfly, you can create realistic simulations of the APIs your application depends on.

  • Replace slow, flaky API dependencies with realistic, re-usable simulations

  • Simulate network latency, random failures or rate limits to test edge-cases

  • Extend and customize with any programming language

  • Export, share, edit and import API simulations

  • CLI and native language bindings for Java and Python


  • Lightweight, high-performance, run anywhere

  • Apache 2 license


The Hoverfly source code is available on GitHub.

Hoverfly is developed and maintained by SpectoLabs.