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Launch HN: Momentic (YC W24) – Agents that catch bugs by using your app

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Screenshot of Launch HN: Momentic (YC W24) – Agents that catch bugs by using your app

Momentic is an AI-powered quality-assurance platform designed to verify software changes by exercising applications like a user. Teams describe flows and expected outcomes in plain-English YAML tests, which can be reviewed and versioned in their code repositories. Its Mo agent can explore an app from a prompt and return findings, recordings, and reproduction steps. Coding agents can also use Momentic’s MCP server to create, run, and debug tests. The platform supports web, iOS, and Android apps, and runs locally, on hosted infrastructure, or in CI, where test results can block merges or deployments.

The product addresses the widening gap between faster code generation and confidence that changes work. It uses a knowledge base of product terminology and rules to guide test actions, recovers when interface controls change, and proposes permanent test repairs for human review. Failure reports include screenshots and traces to help distinguish application bugs from flaky tests or environment problems. Momentic cites more than 117,000 bugs caught and millions of test runs, alongside customer-reported reductions in manual testing and faster releases. Enterprise features include SOC 2 Type 2 certification, SSO, role-based access, audit logs, and support commitments. The site also introduces QA Bench, a comparison of Mo, Codex, Claude Code, and Devin on 1,396 labeled bugs, measuring bugs found and the accuracy of reported findings.

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