Specmatic
Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.
What Specmatic is
Specmatic is a contract-driven development tool that treats API specifications as executable contracts. Supported specification formats include OpenAPI, AsyncAPI, GraphQL SDL files and gRPC proto files. Running these contracts gives feedback on changes before they break dependent services. The stated aim is to let each service deploy independently without relying on integration tests. The core library is published to Maven Central. A Docker image is also available.
Written from the project's README, read .
- Category
- Contract testing
- License
- MIT
- Language
- Kotlin
- Changelog
- Releases on GitHub
Repository metrics
Status
activeLast commit within 90 days of the fetch date.Computed from the last commit date and the archive flag on the fetch date. See the status rules.
Alternatives
Listed contract testing tools, same primary language first, then by GitHub stars. Each line gives one fact from the tool's documentation where it differs from Specmatic's, with its source.
Pact-JVM: Languages for writing tests: JVM languages: Java, Groovy, Kotlin; Scala via pact4s; Clojure through the JUnit library. source: README
Prism: Contract or spec formats: OpenAPI v3.1, v3.0 and v2.0 (Swagger); Postman Collections. source: README
Pact Ruby: Languages for writing tests: Ruby with RSpec. source: README
Pact JS: Languages for writing tests: JavaScript on Node.js (Node 16+ as of pact-js v12). source: README
Pact Go: Languages for writing tests: Go (consumer package github.com/pact-foundation/pact-go/v2/consumer). source: README
Pact Net: Languages for writing tests: .NET (C# samples written with xUnit). source: README
Pact Broker: Contract or spec formats: Pacts; any contract that can be serialized to JSON. source: README
Spring Cloud Contract: Languages for writing tests: Contract DSLs in Groovy, YAML, Java and Kotlin. source: Docs: Contract DSL
Questions
Is Specmatic open source?
Yes. Specmatic is released under MIT, an OSI-approved license, as reported by the GitHub API on 2026-09-22.
Is Specmatic maintained?
On 2026-09-22, the last commit to the default branch was on 2026-09-22, so the listed status is active. Rule: Last commit within 90 days of the fetch date.
How many GitHub stars does Specmatic have?
397 stars on 2026-09-22, from the GitHub API. The number is refreshed at each monthly update.
What language is Specmatic written in?
The repository's primary language, as reported by the GitHub API, is Kotlin.
Sources
- GitHub REST API: repository, read
- GitHub REST API: commits, read
- GitHub REST API: latest release, read
- GitHub REST API: contributors, read
- README, read