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Y Combinator

Web Simulation & Annotation for Browser Agents

Building robust web agents requires reproducible testing, high-quality labels, and scalable evaluation. Our platform provides a deterministic web simulator and an annotation framework so you can collect labels, benchmark agents, and debug performance without worrying about web drift, IP bans, or rate limits.

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Reproducible Web Environments for Fair Agent Evaluation

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Scalable Annotation for Ground Truth Labels

Agent eval steps

Agent Debugging & Continuous Improvement

Agent eval steps

With our deterministic web simulation and annotation platform, you can collect high-quality labels, evaluate agents with confidence, and continuously improve performance—without the unpredictability of the live web.