Prism vs Insomnia

Prism6.9Visit Insomnia6.8Visit

Higher score Prism #7 in API Development Tools 6.9/10 Free plan Free plan✓ 0 of 4 features Visit Prism

vs

Insomnia #8 in API Development Tools 6.8/10 Free plan · paid from $12/user/mo · 14-day trial Free plan✓ 0 of 4 features Visit Insomnia

• Prism fits best

  Teams needing OpenAPI mocks and contract validation

• Insomnia fits best

  Teams needing a multi-protocol API client and test workflow

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Side by side

Feature	Prism 6.9/10 Visit ↗	Insomnia 6.8/10 Visit ↗
At a glance
Editor score	6.9	6.8
Ranking	#7 in API Development Tools	#8 in API Development Tools
Best for	Teams needing OpenAPI mocks and contract validation	Teams needing a multi-protocol API client and test workflow
Pricing model	Free	Free plan + paid
Starting price	Not published	$12/user/mo
Free plan	✓	✓
Free trial	—	—
Deployment	Cloud, Self-hosted	Cloud, Self-hosted, Desktop
Platforms	Web	Windows, macOS, Linux
Support	Community, Docs	Email
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Prism 0/4 · Insomnia 0/4
API design	Not published	Not published
API testing	Not published	Not published
Mock servers	Not published	Not published
Version control	Not published	Not published
Specs
API spec formats	Not published	Not published
Deployment	Not published	Not published
Our review
Pros	Generates HTTP mocks from OpenAPI v2, v3.0 and v3.1 documents Validates requests and responses against an API contract Supports dynamic examples, callbacks and CI usage	Supports HTTP, REST, GraphQL, gRPC, SOAP, WebSocket, and SSE requests OpenAPI design, scripting, unlimited collection runs, and Inso CLI automation Local, Git, and cloud storage, with mock servers and team collaboration
Cons	Focused on mocking and validation rather than broad API authoring Hosted mock servers are a separate Stoplight offering Support channels are community and documentation	Essentials limits Git Sync projects to 3 users and mock requests to 1,000 monthly Role-based access control and unlimited organizations require the Pro plan SSO, SCIM, Vault integrations, and unlimited mock requests require Enterprise
Our verdict	Prism is an open-source HTTP mock server and validation proxy for frontend and backend developers working before an API backend is complete, as well as teams doing contract testing in development or pre-production. It creates mock APIs… Read the review →	Insomnia brings API design, request debugging, testing, mocking, and automation into one workflow for developers and teams. It supports HTTP, REST, GraphQL, gRPC, SOAP, WebSocket, and SSE requests, alongside OpenAPI design with live… Read the review →

Strengths and trade-offs

• Prism — where it wins

  • Generates HTTP mocks from OpenAPI v2, v3.0 and v3.1 documents
  • Validates requests and responses against an API contract
  • Supports dynamic examples, callbacks and CI usage

  Where it doesn't

  • Focused on mocking and validation rather than broad API authoring
  • Hosted mock servers are a separate Stoplight offering
  • Support channels are community and documentation

• Insomnia — where it wins

  • Supports HTTP, REST, GraphQL, gRPC, SOAP, WebSocket, and SSE requests
  • OpenAPI design, scripting, unlimited collection runs, and Inso CLI automation
  • Local, Git, and cloud storage, with mock servers and team collaboration

  Where it doesn't

  • Essentials limits Git Sync projects to 3 users and mock requests to 1,000 monthly
  • Role-based access control and unlimited organizations require the Pro plan
  • SSO, SCIM, Vault integrations, and unlimited mock requests require Enterprise

• Prism6.9/10 · Free plan

  A focused choice for teams that need API mocks and contract checks, not broad authoring tools.

  Visit PrismFull verdict →
• Insomnia6.8/10 · Free plan · paid from $12/user/mo · 14-day trial

  A multi-protocol API workflow with OpenAPI tools, automation, and team plans.

  Visit InsomniaFull verdict →