Get API contracts approved before merging.
ContractKit gives your team an approval workflow for API changes — define endpoints, send for review, get sign-off, then ship. No more surprise breaking changes after the PR lands.
No credit card required · Free forever on Solo plan
Projects
Modules
User Service API
Auth Module · v2.1.0
/api/v1/auth/login✓ Agreed/api/v1/users/profile✓ Agreed/api/v1/users/{id}◎ Pending/api/v1/sessions/{token}⧗ ReviewFeatures
Every API response automatically carries governance fields — createdBy, modifiedBy, timestamps, and more — for full traceability without extra configuration.
Define a contract once and generate production-ready client SDKs and server stubs in Java, TypeScript, Go, Kotlin, Python, Swift, Rust, and more.
Separate concerns cleanly across developer, reviewer, and functional owner roles. Every change goes through the right hands before it ships.
Push your OpenAPI spec directly to any GitHub repository with a single click. Automatically create versioned releases and trigger downstream CI/CD.
Every contract change is versioned. Roll back to any previous state in seconds, compare diffs, and understand exactly what changed and why.
Import your existing APIs and merge ContractKit contracts into live applications. No greenfield project required — works with your current stack.
How It Works
Describe every endpoint, request field, response field, and compliance attribute before writing a single line of implementation code.
ContractKit generates client SDKs and server stubs across all languages. Reviewers and functional owners approve every change.
Push the agreed OpenAPI spec to GitHub, trigger your CI/CD, and let both frontend and backend teams build to the same truth.
What teams say
“We used to spend two sprints arguing about field names. ContractKit eliminated that entirely. Backend and frontend agreed before a line of code was written.”
Priya R.
Staff Engineer · FinTech startup
“The multi-language codegen is the killer feature. One contract, TypeScript types for frontend and Java DTOs for backend — perfectly in sync every release.”
Marcus T.
Engineering Lead · SaaS platform
“Audit compliance used to be an afterthought. Now governance fields are baked into every endpoint automatically. Our security team actually smiled.”
Li W.
Principal Architect · Healthcare tech
Pricing
| ✨ After public validation and feedback | ||||
|---|---|---|---|---|
| Features | ProFor professional solo developers shipping daily $9/mo Spacer | Most Popular TeamFor teams with review, governance and collaboration $49/mo Spacer | EnterpriseFor security-heavy orgs that need control and deployment flexibility Freeforever Spacer | |
| Projects | 3 | Unlimited | Unlimited | Unlimited |
| Endpoints per project | 10 | Unlimited | Unlimited | Unlimited |
| Language Generators | All | All | Custom & Policy Engine | |
| OpenAPI Export | ||||
| Try API client | ||||
| GitHub Publishing | ||||
| History retention | 7 days | 90 days | 90 days | Immutable logs |
| AI features | 500 credits / mo | Unlimited | Custom | |
| Hosted docs site | ||||
| Always-on mock servers | 1 | 3 | Unlimited | |
| Team minimum | 3 seats | Custom | ||
| Organizations & RBAC | ||||
| Review workflow | ||||
| Inline comments | ||||
| Runner testing | ||||
| SAML / SSO | ||||
| Self-hosted deployment | ||||
| Data residency options | ||||
| Dedicated SLA & Support | ||||
Join engineering teams who ship with certainty. Start for free — no credit card required.