Checksum

Checksum is a testing platform built for the era of AI-assisted coding. It addresses a core problem: when AI coding agents write code, traditional tests often miss bugs that occur in the complex interactions between systems. Checksum runs your code against a simulated production environment—using real APIs, real data, and real edge cases—before it ever ships. This 'code world model' aims to make the invisible space between systems visible, catching issues that would otherwise only appear in production.

The platform works through specialized testing agents. These AI agents automatically create production-ready Playwright tests for end-to-end, API, and unit testing. When your application changes, the agents can heal broken tests. They integrate directly into your CI/CD pipeline, running tests on every pull request and monitoring production errors to turn every discovered bug into a new test. This creates a feedback loop where the test suite continuously improves and adapts.

Development teams that want to ship code faster without sacrificing quality will find Checksum most useful. It's designed for teams using AI coding assistants who need their testing to keep pace with accelerated development. The platform helps maintain confidence as codebases grow and change, providing automated, intelligent test coverage that scales with the output of modern development workflows.