Prism vs Apidog
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 sourceFrom $9 per user/month (Basic, billed annually; Professional $18, Enterprise $27)
Free tierWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
Priced noticeably below Postman for comparable team functionality.
Free tier
Everything, self-hosted
Free plan for small teams with core design, mock and test features.
Open source
Apache-2.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Established
Stoplight (SmartBear) · since 2017
Established
Apidog · since 2022
Strengths
- 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.
- Schema-driven mocks and assertions stay correct as the API definition changes.
- Meaningfully cheaper than Postman for equivalent team features.
- One tool instead of three for design, mocking and documentation.
Limitations
- 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.
- Younger vendor with a smaller community and fewer third-party integrations.
- Data residency and cloud storage need checking for regulated environments.
- Documentation quality is uneven in places.
Best for
Design-first API teams who want mocks that are provably in sync with the contract.
Teams doing design-first API development who want mocks and docs generated from the spec.
All of these integrate with: OpenAPI.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.