testing
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Roark
Roark is an observability, testing, and quality-assurance platform for voice AI agents. It lets teams replay real production calls against new agent versions, catch failures before they ship, track caller sentiment and vocal cues, and monitor live voice interactions with 40+ built-in metrics. Founded in 2025 and backed by Y Combinator (W25), Roark says it processed more than 10 million minutes of calls in its first six months.
Zelos Cloud
Zelos Cloud is a San Francisco-based B2B data platform for mission-critical systems, founded in 2023 by three former Tesla and Neuralink engineers. The platform unifies data collection, remote command-and-control, real-time visualization, and automated testing for firmware and industrial systems - solving the tooling chaos that plagues teams building hardware that cannot afford to fail. Backed by Y Combinator (S23) and Human Capital, Zelos Cloud is building the operating layer that firmware and embedded systems engineers have always needed but never had.