oasdiff vs OpenAPI Studio

oasdiff compares OpenAPI specifications, produces changelogs, and identifies breaking changes before release. It supports OpenAPI 3.0, 3.1, and 3.2, and detects 755 distinct breaking and non-breaking API changes. The CLI is available through Homebrew, a shell installer, Docker, and pre-built Linux, macOS, and Windows binaries. Output formats include text, JSON, YAML, HTML, Markdown, and GitHub Actions annotations. Its GitHub Action compares pull-request and base-branch specifications, adding inline annotations for breaking changes. A browser diff tool compares OpenAPI or Swagger specifications without installation or sign-up. Specs and changelogs are encrypted client-side before upload, and servers retain ciphertext they cannot read. The open-source engine, CLI, and GitHub Action use the Apache 2.0 license. A free plan includes CLI diffing, changelogs, GitHub Action annotations, side-by-side review, and encrypted spec storage. Pro costs $100/month and adds approval workflow, audit trail, merge gate, and up to five reviewers across five repositories. Free review links expire after seven days; Enterprise can load specs from GitHub without uploading or storing them.

OpenAPI Studio is a visual editor for designing, testing, and publishing AI-ready APIs on the web or through self-hosted deployment. Its flow builder displays API paths as node graphs with four layout algorithms. A server-side proxy executes requests without browser CORS limitations. Recipes can chain up to 10 API calls, map responses with JSONPath, and apply assertions at each step. Every workspace includes a six-tool MCP server for searching, retrieving, creating, updating, running, and analyzing. The service supports OpenAPI, AsyncAPI, contract validation, Git synchronization, and team collaboration. WebSocket endpoints can be modeled and tested, then exported as AsyncAPI 3.0 YAML. Native integrations include GitHub, Slack, Linear, Notion, and MCP connections for AI assistants; OAuth is used and tokens are encrypted in workspaces. Roles include Owner, Editor, and Viewer. Plans are Free at free, Pro at $9 a month, Team at $29 a month, and Scale at $99 a month.