oasdiff
oasdiff: A focused OpenAPI diff and merge-gating tool for GitHub-centered API teams. Ranked #20 of 22 in Contract Testing Tools by our editors (7.2/10); pricing: Free plan · 30-day trial; best for openAPI teams enforcing breaking-change gates.
At a glance
- Editor score7.2 / 10
- PricingFree plan · 30-day trial
- Best forOpenAPI teams enforcing breaking-change gates
- Free planYes
- Paid from$100/mo
- Facts checked20 Sep 2026
Where it wins
- Detects breaking changes across OpenAPI 3.0, 3.1, and 3.2
- Adds GitHub pull-request reviews, annotations, merge gates, and audit trails
- Open-source CLI supports YAML, JSON, HTML, Markdown, and text diffs
Where it doesn't
- Focused on OpenAPI rather than AsyncAPI or GraphQL
- Pro limits teams to 5 reviewers across 5 repositories
- Contract testing workflows are not part of its documented focus
Our verdict on oasdiff
oasdiff is an open-source toolchain for comparing OpenAPI specifications, detecting breaking changes, and reviewing API updates before release. It is designed for API teams managing versioned OpenAPI contracts across local development, CI/CD pipelines, and GitHub-based workflows. The product combines a command-line interface with validation, changelogs, machine-readable diff reports, GitHub Actions integration, and browser-based side-by-side reviews. Its strongest fit is a team that wants explicit API change controls rather than a broad contract management suite.
The published plans show a useful progression. The Free plan costs $0 per month and includes CLI diffs, breaking-change detection, changelogs, GitHub Action annotations, shareable review pages, encrypted review uploads, and no account requirement. Pro costs $100 per month and adds pull-request approval and rejection workflows, audit trails, breaking-change merge gates, and support for up to 5 reviewers across 5 repositories. Enterprise adds unlimited repositories and reviewers, GitHub-loaded specifications per review, an SLA, and dedicated support. A 30-day free trial is also available.
GitHub Actions, GitHub pull requests, Docker, and browser-based reviews give oasdiff a practical fit for teams already working around OpenAPI files and pull-request controls. It supports OpenAPI and JSON Schema validation and can produce reports in YAML, JSON, HTML, Markdown, and text. Self-hosting and web, Windows, macOS, Linux, and API coverage provide deployment flexibility. However, its scope is deliberately centered on specification comparison and breaking-change governance. Teams seeking verified consumer/provider contract testing, AsyncAPI or GraphQL coverage, or a hosted contract registry should choose a more specialized alternative. Choose oasdiff when OpenAPI change review and merge enforcement are the priority.
Your product? Our editors can test oasdiff in depth and publish a review, labelled as paid · from $149/mo →
oasdiff pricing
All 3 oasdiff plans and prices →
oasdiff fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $100/mo |
| Contract formats | OpenAPI 3.0, OpenAPI 3.1, OpenAPI 3.2; JSON and YAML |
| Consumer verification | Not verified |
| Provider verification | Not verified |
| Contract registry | Not verified |
| AsyncAPI support | No |
| GraphQL support | No |
| Self-hosted deployment | Yes |
| Free trial | 30 days · no card needed |
| Deployment | Cloud, Self-hosted |
| Platforms | Web, Windows, macOS, Linux |
| Support | Email, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 3 integrations: GitHub Actions, GitHub pull requests, Docker |
| Pricing | Free plan · 30-day trial (source) |
| Website | oasdiff.com |
| Facts checked | 20 Sep 2026 |
oasdiff integrations
oasdiff lists 3 integrations on its own site.
- GitHub Actions
- GitHub pull requests
- Docker
Alternatives to oasdiff
- PactA broad open-source toolkit for consumer-driven contracts across HTTP and message integrations.9.4
- MicrocksA broad contract-testing choice for APIs, microservices, and event-driven systems.9.2
- PactFlowPactFlow brings Pact, OpenAPI testing, contract management, and deployment checks together.9.0
See all oasdiff alternatives →
Also Ranked In
oasdiff is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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