Stoplight
Design-first API platform with a visual OpenAPI editor, mock servers, and governance tooling.
Acquired — still operating
Acquired by SmartBear in August 2023; the Stoplight platform is still sold while its tooling is being integrated into SmartBear API Hub and SwaggerHub.
About
Stoplight is a design-first API platform built around a visual editor for OpenAPI specifications. Designers and developers collaborate on specs without hand-writing YAML, publish interactive documentation, spin up automatic mock servers, and enforce API style guides and governance across an organization's API portfolio.
SmartBear acquired Stoplight in August 2023 and has been integrating its capabilities into SwaggerHub and its API Hub offering. The Stoplight platform is still sold as of late 2026, but the open-source tooling is the safest long-term bet: Spectral (linting), Prism (mock servers), and Elements (documentation components) are all Apache-2.0 licensed and saw commits through September 2026. Independent analysts note slowing platform development and recommend getting the roadmap in writing before renewing.
What it can do
- Visual no-code editor for OpenAPI specifications
- Interactive hosted API documentation
- Automatic mock servers from specs
- API style guides and governance rules
- Open-source Spectral, Prism, and Elements (Apache-2.0)
Setup
Use the hosted Studio editor or pull the open-source Spectral, Prism, and Elements packages into your own workflow.
Prerequisites
Use cases
Works with
Trust score — 7/10
Scored 7/10 (verified tier, metrics-v1). Evidence: SmartBear acquisition confirmed August 22, 2023; pricing page still live September 2026 with SmartBear copyright; Spectral, Prism, and Elements are Apache-2.0 with September 2026 commits. Strengths: design-first visual editor, strong open-source portfolio, governance tooling. Docked for: (1) uncertain platform roadmap under SmartBear (informed opinion notes slowing development, no official EOL); (2) proprietary platform core. License: platform proprietary; Spectral, Prism, Elements are Apache-2.0.
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 8.0/10
- Maintenance · recency, releases, issue load
- 6.0/10
- Openness · license + docs
- 7.0/10
- Manual review · sanity read + red-flag check
- 7.0/10
- · Strengths: design-first visual editor, strong open-source portfolio (Spectral, Prism, Elements), governance tooling
- · SmartBear acquisition confirmed August 22, 2023; pricing page still live September 2026; OSS tools had September 2026 commits
- · Docked for: (1) uncertain platform roadmap under SmartBear (informed opinion notes slowing development, no official EOL); (2) proprietary platform core
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.