SpecShield
SpecShield compares OpenAPI descriptions to flag changes that could break existing API consumers, then reports results as GitHub checks.
What SpecShield is
SpecShield compares OpenAPI descriptions to flag changes that could break existing API consumers, then reports results as GitHub checks. It can detect removed endpoints, tightened types and newly required fields on pull requests. A consumer registry tracks which services depend on an API so a deploy gate can check compatibility. GitHub checks include a diff and compatibility verdict, and can block a merge when a consumer would be broken.
SpecShield also scores OpenAPI descriptions against OWASP and design rulesets on a 0–100 scale with a letter grade. Integrations include a GitHub App and Action, a CLI for CI systems, an IntelliJ plugin, SARIF output and an MCP server for AI agents. The Free plan costs nothing and is limited to one user, with seven-day comparison history and one GitHub App pull request check. Team costs $89 a month, or $900/year ($75/mo billed annually), and includes up to 10 users, a consumer registry, deploy gate, audit trail, Slack alerts, shared workspace and RBAC. The browser diff accepts OpenAPI 3.0 and 3.1 in JSON or YAML; submitted specs are compared in the request and not persisted by that free diff.
Good
- Flags breaking changes in pull requests.
- Consumer registry tracks services that depend on APIs.
- GitHub checks can block breaking merges.
- Free browser diff does not persist submitted specs.
- Supports OpenAPI 3.0 and 3.1 in JSON or YAML.
Watch out
- Free is limited to one user.
- Free includes one GitHub App pull request check.
- Free comparison history lasts seven days.
- Team costs $89 a month.
Who it suits
SpecShield is for backend, mobile, platform, microservices and release engineering teams shipping OpenAPI APIs. It suits teams looking for compatibility checks in pull requests and deployment gates.
Verdict
SpecShield focuses on API compatibility checks tied to consumer dependencies, with additional governance scoring and team controls. The Free plan has tight user, history and GitHub-check limits.
Plans and prices
From SpecShield's own pricing page, checked 29 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| SpecShield Free | Free | 1 user · unlimited spec comparisons · 1 GitHub App PR check · 7-day compare history · community support · Free forever |
| SpecShield Team | $89 a month | Up to 10 users · consumer registry · can-i-deploy gate · audit trail · BDCT · Slack alerts · shared workspace · RBAC · $89/month, or $900/year ($75/mo billed annually) |
| SpecShield Enterprise | Priced on request | Unlimited users · SSO · on-prem/private-cloud on request · advanced RBAC · audit-log export · dedicated onboarding · SLA · Custom pricing |
The facts
Each one read from SpecShield's own pages, with the date it was checked.
What it does
- Breaking change detection
- It flags removed endpoints, tightened types, and newly required fields on pull requests.checked 29 Sep 2026
- Consumer registry
- The consumer registry records which services depend on an API so the deploy gate can assess compatibility.checked 29 Sep 2026
- GitHub checks
- The GitHub App posts pull request checks with a diff and compatibility verdict, and can block merges when a consumer would break.checked 29 Sep 2026
- Governance
- It scores OpenAPI descriptions against OWASP and design rulesets on a 0–100 scale with a letter grade.checked 29 Sep 2026
- Integrations
- The product offers a GitHub App and Action, CLI for CI systems, IntelliJ plugin, SARIF output, and an MCP server for AI agents.checked 29 Sep 2026
- Purpose
- SpecShield compares OpenAPI descriptions to flag changes that could break existing API consumers and reports results as GitHub checks.checked 29 Sep 2026
- Security evidence
- The maker says its audit log records logins, invites, role changes, contract publishes, deploy verdicts, and breaking-change detections in an append-only table, with CSV export.checked 29 Sep 2026
- Support
- Free includes community support, Team includes priority email support, and Enterprise includes a dedicated SLA.checked 29 Sep 2026
- Supported specs
- The browser diff accepts OpenAPI specifications in JSON or YAML, including OpenAPI 3.0 and 3.1.checked 29 Sep 2026
- Who it is for
- The maker describes the product for backend, mobile, platform, microservices, and release engineering teams shipping OpenAPI APIs.checked 29 Sep 2026
Money
- Free diff privacy
- The free browser diff compares submitted specs in the request and says it does not persist them.checked 29 Sep 2026
- Free plan limit
- The Free plan is limited to one user and includes seven-day compare history and one GitHub App pull request check.checked 29 Sep 2026
The company
- Team features
- The Team plan includes an enforced can-i-deploy gate, audit trail, bidirectional contract testing, Slack alerts, shared workspace, and RBAC.checked 29 Sep 2026
Alternatives to SpecShield
- 1
Karate
Free planOpen sourceAPIExtensionLinuxmacOS8.2From $100 a year - 2
PactFlow
Free planWebAPILinuxSelf-hosted7.6From $115.42 a month - 3
Pact
Free planAPILinuxmacOSSelf-hosted7.5From $115.42 a month - 4
Microcks
Free planWebAPIExtensionLinux7.2Free plan - 5
oasdiff
Free planWebAPILinuxmacOS7.2From $100 a month - 6
Confluent Cloud
Free planWebAPILinux7.1From $385 a month