AI visibility report
Stoplight ranks #6 in API Mocking & Service Virtualization AI search.
Outside the top three on 20 of the 25 prompts buyers actually ask.
WireMock is cited on 12 of those losses.
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Track Stoplight across these prompts daily.
Start free trial#6 among 9 vendors · still absent from 92% of tracked prompt responses
Top-3 citations across 125 prompt × platform pairs
Peer Ranking
Key Metrics
Platform Breakdown
Google AI Mode
ChatGPT
Perplexity
Gemini Search
GrokVisible, but narrative can improve. Stoplight ranks #6 on presence but #7 on sentiment. The brand appears relatively often, but competitors may be getting more favorable language when they appear.
Where Stoplight is losing
Prompts where competitors are visible and Stoplight is not.
These prompt-level losses are the first prompts to track and repair.
Where Stoplight is winning
No clear strengths identified yet.
Where Stoplight is losing5
Which service virtualization tools have the shortest learning curve for a QA team that's never done API mocking before?
Competitors on 4 platforms
Track this promptLooking for a desktop app that lets me design and run mock REST endpoints offline for local dev -- what are my options?
Competitors on 3 platforms
Track this promptWhich API mocking tools support stateful scenarios -- where the response depends on what was sent before?
Competitors on 3 platforms
Track this promptWhich service virtualization tools can record real production traffic and replay it as a mock?
Competitors on 3 platforms
Track this promptWhat are the best tools for simulating gRPC and GraphQL APIs, not just REST?
Competitors on 3 platforms
Track this prompt
Track Stoplight daily before the next report refresh.
Track these gapsResearch dossierCapabilities, use cases, sources, reviews, pricing, and FAQ
Overview
Stoplight is a design-first API lifecycle platform, now operating under SmartBear Software following its acquisition in August 2023. Founded in 2015 in Austin, Texas, Stoplight enables development teams to design, document, mock, and govern REST APIs using OpenAPI specifications as a central source of truth. The platform combines a visual and code-based API editor, automatic mock server generation (via the open-source Prism tool), interactive documentation (via Elements), and linting/governance (via Spectral). Stoplight targets API developers, program managers, and enterprise teams seeking consistency and reusability at scale. Its design-first philosophy allows frontend and consumer teams to begin integration work against mock APIs before backend implementation is complete. Customers include Calendly, Schneider Electric, PagerDuty, Fiserv, and Transact. The platform is offered as SaaS with tiered pricing and a free tier.
Stoplight Platform is a SaaS API design, documentation, mocking, and governance solution built around OpenAPI specifications. It provides a hybrid visual/code editor for designing APIs, automatically generates hosted mock servers via Prism from OpenAPI documents, enforces governance through Spectral-powered linting and shared style guides, and publishes interactive documentation via Elements. The platform integrates with Git providers for version control, supports enterprise access management via SAML/LDAP SSO, and exposes an API catalog for workspace-wide API portfolio visibility. Three flagship open-source tools (Prism, Spectral, Elements) underpin the platform and are independently available to the developer community.
Key Facts
- Founded
- 2015
- HQ
- Austin, TX, USA
- Founders
- Marc MacLeod
- Employees
- 50+
- Funding
- ~$21.9M
- Customers
- 75K+ users across 40+ countries
- Status
- Acquired (SmartBear Software, Aug 2023)
Target users
Key Capabilities9
- Visual + code-based OpenAPI and JSON Schema editor with real-time validation
- Automatic HTTP mock server generation from OpenAPI specs via open-source Prism
- API linting and style-guide enforcement via open-source Spectral
- Interactive, hosted API documentation with try-it-out console via Elements
- Git-based project versioning with multi-branch and multi-provider support
- Shared component libraries and reusable schema models across projects
- API dependency graph for portfolio visibility and impact analysis
- Configurable mock responses including static, dynamic, and validation-based responses
- RBAC, SAML/LDAP SSO, and workspace team management for enterprise governance
Key Use Cases7
- Design-first API development to reduce rework and align stakeholders before coding
- Generating instant mock servers from OpenAPI specs for parallel frontend/consumer development
- Enforcing API style guides and governance standards across large engineering organizations
- Publishing interactive developer documentation and internal API portals
- Centralizing and governing a large portfolio of OpenAPI specifications
- Enabling cross-team API collaboration with Git-synced shared workspaces
- Accelerating API onboarding with reusable templates and shared design libraries
Stoplight customer outcomes
80% reduction in API development time
Transact adopted a design-first approach using Stoplight and reduced API development time from idea to consumption, crediting the platform with eliminating rework by getting designs right the first time. New APIs are delivered in approximately two weeks with no more than two peop
API development reduced from up to 3 weeks to a matter of days
Schneider Electric used Stoplight's design libraries and linting capabilities to replace its black-box API review process, cutting the iterative back-and-forth review cycle and reducing overall API design and development time from weeks to days.
Recent Trend
How AI describes Stoplight3
Stoplight Platform * Provides API design, mocking, and testing capabilities; designed to keep mocks aligned with OpenAPI design changes within the same environment.
Which service virtualization platforms integrate with OpenAPI design tools so a spec change automatically updates the mock?
Stoplight Studio (desktop/web) – API design and mocking with a visual schema editor and mock responses, offering a GUI-centric workflow for defining responses and validators rather than code-only configuration.
What are the best API mocking tools that provide a polished GUI rather than requiring YAML or code-only configuration?
Stoplight Prism (The Local/CI Leader) ----------------------------------------- Prism is an open-source, ultra-lightweight mock server designed specifically by Stoplight (now part of SmartBear) to sit right next to your design tools.
Which service virtualization platforms integrate with OpenAPI design tools so a spec change automatically updates the mock?
Most cited sources8
29stoplightio/prism: Turn any OpenAPI2/3 and Postman ...
github.com·Documentation
- 26
Prism | Open-Source HTTP Mock and Proxy Server | Stoplight
stoplight.io·Documentation
- 19
Instant API Mock Servers from OpenAPI For Testing | API Mocking Tools | Stoplight
stoplight.io·Documentation
- 8
Open-Source API Mocking, Linting, & Documentation | Stoplight
stoplight.io·Documentation
- 7
Mock API Server Online Guide | Mock APIs Testing & API Mocking Guide | Stoplight
stoplight.io·Documentation
- D5
HTTP Mocking | Prism - Stoplight Documentation
docs.stoplight.io·Documentation
Alternatives in API Mocking & Service Virtualization6
Stoplight differentiates itself as a design-first API lifecycle platform where mocking is embedded into the broader workflow rather than offered as a standalone tool.
- Its open-source Prism server auto-generates HTTP mocks directly from OpenAPI documents, enabling parallel frontend and backend development.
- Unlike dedicated mocking tools (WireMock, Mockoon, Beeceptor), Stoplight bundles mock servers with a visual editor, governance (Spectral linting), documentation (Elements), and Git-based collaboration.
- Since its August 2023 acquisition by SmartBear, Stoplight is positioned as the design and governance layer of SmartBear's broader API suite—complementing Swagger, ReadyAPI, and SoapUI—giving it enterprise reach that pure-mocking competitors lack.
- Its primary weakness in the mocking-specific vertical is narrowness of protocol support (REST/OpenAPI-centric), ceding messaging, gRPC, and legacy protocol mocking to more specialized service virtualization platforms.
Reviews
Praised
- Intuitive visual API editor with code/visual toggle
- Strong OpenAPI and JSON Schema support
- High-quality auto-generated interactive documentation
- Easy setup and onboarding
- Spectral linting and style-guide enforcement
- Mock server generation from OpenAPI specs
- Granular user permissions and access controls
- Design-first workflow promotes collaboration
Criticized
- Creating new API projects can be slow and time-consuming
- Limited advanced API testing features compared to Postman or Apidog
- Overall satisfaction rated lower than newer unified tools
- Primarily REST/OpenAPI-centric, limited protocol breadth
- Post-acquisition roadmap visibility reduced
Stoplight holds a 4.4/5 rating on G2 across 343 verified reviews (as of April 2026), with 64% of reviewers awarding 5 stars and 31% awarding 4 stars. Reviewers consistently praise the intuitive visual API editor, quality of generated documentation, OpenAPI design workflow, and ease of getting started. The ability to seamlessly switch between code and visual views is frequently highlighted. Criticisms focus on limited advanced API testing capabilities, occasional slowness when setting up new projects, and a perception that overall satisfaction lags behind newer all-in-one tools like Apidog and Postman. G2 has recognized Stoplight as a Leader in the API Design category across multiple consecutive report periods (Spring, Summer, Fall, and Winter 2022, and into 2023).
Pricing
Stoplight offers five tiers.
- Free
1 user, 1 project, core design and documentation features.
- Basic
$44/month (annual) or $56/month (monthly), 3 users included, $11 per additional user/month (annual); includes OpenAPI visual designer, interactive docs, and instant mock servers. Startup: $113/month (annual) or $147/month, 8 users included, adds private projects, multi-branch support, custom domains, and Google Analytics integration.
- Pro Team
$362/month (annual) or $453/month, 15 users included, $22 per additional user/month (annual); adds up to 20 teams, shared style guides, LDAP/SAML SSO, activity logs, and component libraries.
- Enterprise
custom pricing with unlimited projects and teams, invoicing, custom payment terms, and priority support. All paid plans include a 14-day free trial.
Limitations
- Stoplight's mocking and API support is limited to REST/HTTP APIs defined in OpenAPI (Swagger) or JSON Schema; it does not natively support gRPC, GraphQL, SOAP, or messaging protocols (Kafka, MQ), limiting its applicability for polyglot or legacy service virtualization needs.
- API testing capabilities are minimal compared to dedicated tools (Postman, Karate Labs, ReadyAPI).
- G2 reviewers note that creating new API projects can be slow and time-consuming.
- Some users report a learning curve for teams unfamiliar with OpenAPI.
- Post-acquisition, Stoplight's standalone roadmap has been merged into SmartBear's broader product strategy, which may reduce iteration speed for Stoplight-specific features.
Frequently asked questions
Topic coverageCoverage by buyer topic
Topic Coverage
Prompt-Level Results
| Prompt | Perplexity | ChatGPT | Gemini Search | Google AI Mode | Grok |
|---|---|---|---|---|---|
Capability0/5 cited (0%) | |||||
What mocking platforms support multi-protocol simulation including MQ, Kafka, and SOAP for enterprise integration testing? | |||||
Which API mocking tools support stateful scenarios -- where the response depends on what was sent before? | |||||
I need to simulate network failures, latency, and rate limiting for chaos testing -- which API mocking platforms handle fault injection well? | |||||
Which service virtualization tools can record real production traffic and replay it as a mock? | |||||
What are the best tools for simulating gRPC and GraphQL APIs, not just REST? | |||||
Developer Experience2/5 cited (40%) | |||||
Which API simulation tools work nicely with contract-testing workflows so my mocks stay in sync with the real API? | |||||
What are the best API mocking tools that provide a polished GUI rather than requiring YAML or code-only configuration? | |||||
Which API mocking tools offer the best day-to-day workflow for frontend developers working in parallel with a backend team? | |||||
Which service virtualization platforms have the nicest collaboration features for a distributed team sharing mock environments? | |||||
What mocking platforms let me version-control my mock definitions in Git and review them like code? | |||||
Integrations & Ecosystem2/5 cited (40%) | |||||
Which API mocking tools integrate well with CI/CD pipelines so mocks spin up automatically for each test run? | |||||
Which service virtualization platforms integrate with OpenAPI design tools so a spec change automatically updates the mock? | |||||
What mocking platforms have the best plugin ecosystems for extending matching logic or response generation? | |||||
What API mocking tools work best alongside end-to-end browser testing frameworks for full-stack test suites? | |||||
Which API simulation tools offer official Docker images and GitHub Actions for easy CI integration? | |||||
Performance & Reliability1/5 cited (20%) | |||||
What API mocking solutions give the lowest response latency for realistic performance testing? | |||||
Which API mocking tools can handle load testing at thousands of requests per second without becoming the bottleneck? | |||||
Which mocking tools can be deployed inside a Kubernetes cluster to simulate dependencies during integration tests? | |||||
Which service virtualization platforms scale best for simulating hundreds of microservice dependencies in a large test environment? | |||||
What are the most reliable cloud-hosted mock API services for production-like staging environments? | |||||
Setup & First Run3/5 cited (60%) | |||||
Looking for a desktop app that lets me design and run mock REST endpoints offline for local dev -- what are my options? | |||||
Which service virtualization tools have the shortest learning curve for a QA team that's never done API mocking before? | |||||
I need to simulate a third-party payments API locally during development -- which mocking platforms make that easiest to set up? | |||||
Which API mocking tools let me stand up a working mock in under 5 minutes without writing any code? | |||||
What's the fastest way to spin up a mock API server from an OpenAPI spec for a frontend team that can't wait for the backend? | |||||
Turn this matrix into daily prompt monitoring.
Track prompt changesVertical Ranking
| # | Brand | PresencePres. | Share of VoiceSoV | DocsDocs | BlogBlog | MentionsMent. | Avg PosPos | Sentiment |
|---|---|---|---|---|---|---|---|---|
| 1 | WireMock | 31.2% | 30.7% | 2.4% | 0.0% | 30.4% | #9.9 | +0.32 |
| 2 | Apidog | 23.2% | 21.7% | 0.0% | 20.8% | 20.0% | #10.4 | +0.25 |
| 3 | Mockoon | 16.0% | 15.2% | 0.0% | 0.0% | 16.0% | #6.8 | +0.46 |
| 4 | Speedscale | 12.8% | 8.2% | 0.0% | 12.8% | 10.4% | #8.0 | +0.36 |
| 5 | Beeceptor | 11.2% | 8.2% | 5.6% | 0.0% | 10.4% | #7.5 | +0.36 |
| 6 | Stoplight | 8.0% | 9.8% | 1.6% | 1.6% | 8.0% | #13.4 | +0.25 |
| 7 | Postman | 4.0% | 3.7% | 1.6% | 0.0% | 4.0% | #11.3 | +0.46 |
| 8 | Traffic Parrot | 2.4% | 2.0% | 0.0% | 0.8% | 2.4% | #7.4 | +0.23 |
| 9 | Karate Labs | 0.8% | 0.4% | 0.0% | 0.0% | 0.8% | #9.0 | +0.00 |
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