Hoverfly vs Prism
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free and open source
Open sourceFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
Free and open source. You pay in engineering time and CI minutes.
Free tier
Everything, self-hosted
Everything, self-hosted
Open source
Apache-2.0
Apache-2.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Emerging
SpectoLabs · since 2016
Established
Stoplight (SmartBear) · since 2017
Strengths
- 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.
- The mock is generated from the spec, so it cannot silently diverge from the contract.
- Validation proxy mode checks that a real implementation matches its own spec.
- Zero configuration beyond having an OpenAPI file.
Limitations
- Smaller community and slower development than WireMock.
- Proxy configuration in complex networks takes effort.
- Captured simulations need periodic refresh.
- Useless without an accurate OpenAPI document.
- Limited stateful behaviour — it is spec-driven, not scenario-driven.
- Generated example data is uninteresting unless examples are in the spec.
Best for
Teams needing lightweight service virtualisation against real recorded traffic.
Design-first API teams who want mocks that are provably in sync with the contract.
All of these integrate with: Docker.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.