Mockoon vs Hoverfly

From $9 per user/month (indicative, Cloud)

Free and open source

Free locally; the paid cloud tier adds hosted mocks and team sync.

Free and open source. You pay in engineering time and CI minutes.

The desktop app and CLI are free and open source.

Everything, self-hosted

Widely used

Mockoon · since 2017

Emerging

SpectoLabs · since 2016

• Genuinely a minute from download to a working mock API.
• Dynamic templating with faker-style helpers produces realistic responses.
• Proxy mode mocks only the routes you need and passes the rest through.

• Capture mode produces a realistic simulation from live traffic with no authoring.
• Latency injection makes it useful for performance and resilience testing too.
• Small footprint — a single Go binary.

• Desktop-first; sharing mocks across a team needs the paid cloud or a committed config file.
• HTTP only.
• Less suited to complex stateful behaviour than WireMock.

• Smaller community and slower development than WireMock.
• Proxy configuration in complex networks takes effort.
• Captured simulations need periodic refresh.

Front-end developers unblocking themselves while a backend is still being built.

Teams needing lightweight service virtualisation against real recorded traffic.