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What Graphwake adds
Alerts to subscribed teams
Only the teams subscribed to an endpoint hear about a breaking change, in Slack, Microsoft Teams or email.
Impact score and ownership map
Each change set gets a 0-100 score with public rules, next to a map of who owns each endpoint.
Discovery for unmapped endpoints
When an endpoint has no subscribers, Discovery suggests teams that may be affected, with a reason for each suggestion.
Never blocks a build
A spec URL checked every 30 minutes, or one CI step that never fails or blocks a build.
- A diff and an alert are different jobs. A diff tells the pull request author what changed. It does not know who calls the endpoint. Graphwake keeps that list from team subscriptions and tells only those teams. More in API breaking change alerts.
Start from what you use today
| Your situation | Read |
|---|---|
| You run oasdiff in CI, and other teams still find out about changes in production | oasdiff vs Graphwake |
| Your Optic check runs on an archived repository | Optic alternative |
| You are choosing between oasdiff and Optic for a spec diff in CI | oasdiff vs Optic |
| You publish docs and changelogs with Bump.sh, and the right internal teams still miss changes | Bump.sh alternative |
| You are weighing consumer-driven contract tests | Pact vs Graphwake |
| You want tests generated from your spec, or a check that fails the build on a breaking change | Specmatic vs Graphwake |
| You are choosing between consumer-driven and spec-driven contract tests | Pact vs Specmatic |
| You want every option in one list | oasdiff alternatives |
Side by side
Competitor facts as of 2026-11-01, from each tool’s own site; every comparison page lists its sources. “Not listed” means we did not find it on their public pages; it does not mean it does not exist.
| Feature | oasdiff | Optic | Bump.sh | Pact / PactFlow | Specmatic | Graphwake |
|---|---|---|---|---|---|---|
| Main question | What changed? | What changed? | What changed?and publish it | Does it break at runtime? | Does it break at runtime? | Who is affected, and how badly? |
| Tells the teams that consume an endpoint | Not listed | Not listed | Notifications and webhooksper-team routing not listed | Webhooksper-team routing not listed | Not listed | Yesonly subscribed teams, in Slack, Microsoft Teams or email |
| Impact score and ownership map | Not listed | Not listed | Not listed | Not listed | Not listed | Yes0-100 with public rules |
| Can block a merge | Can fail CI with --fail-onPro adds an approval gate | Not listed | Not listed | Not listed | Yesin CI | Neverthe CI step never fails or blocks a build |
| Finds breaking changes in OpenAPI specs | Yes | Yes | Yeschange detection | Not its approachcontract tests | Yesbackward-compatibility check | Yes |
| Full comparison | Read | Read | Read | Read | Read | Pricing |
When another tool alone is enough
- Only the pull request author needs to know what changed: a spec diff in CI covers that.
- You need to verify what the running service does: that is what contract tests are for.
oasdiff and its name belong to its authors. Graphwake is not affiliated with the oasdiff project.
Questions
Which tool should I use for OpenAPI breaking changes?
If the teams that consume an endpoint need to hear about a breaking change, Graphwake: it keeps the consumer map, scores the impact and alerts only those teams. For a diff in the pull request alone, a spec check such as oasdiff. To verify runtime behavior, contract tests with Pact or Specmatic. They work side by side.
Can I keep oasdiff?
Yes. Graphwake works next to it.
Does Graphwake need our source code?
No code access: Graphwake reads only your OpenAPI spec, from a URL or a CI step.
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Start free trialSources and last verified
Competitor facts were checked on 2026-11-01; check their pages for the latest.