Kaizen: Using computer use and AI to give any website an API — hotel voice agents and legacy portals are first customers
Key Points
- Kaizen wraps websites without APIs into programmatic interfaces using computer use and LLMs, targeting legacy systems like property management tools that have no developer access.
- Hotel voice agents are the company's first major use case, automating guest service orders directly into property management systems that lack APIs.
- The two-founder YC startup has hundreds of thousands in ARR, $500k in the bank, and was closing its first term sheet at Demo Day.
Summary
Kaizen is a two-person YC company building infrastructure that gives developers programmatic access to websites with no API. Most software systems lack APIs, leaving legacy portals, property management tools, and shipping forms inaccessible to automation. Kaizen uses computer use and LLMs to reverse-engineer those interfaces at runtime, effectively wrapping any website into an API without modifying the underlying system.
CEO Ken and CTO Michael stay model-agnostic by design. They use Anthropic's computer use model for UI interactions like clicking elements and Gemini's longer context window when pulling data from large tables. End users see no model switching—the routing is abstracted away entirely.
Hotel voice agents
The clearest use case so far is hotel voice agents. A voice AI company serving properties like the Rio in Las Vegas uses Kaizen to write guest requests back into the property management system. When a guest calls to order toothpaste, the service order is created automatically rather than routed through a human operator. Those property management systems have no API, so Kaizen navigates the front end on the customer's behalf.
Ken built the product from direct experience. As head of engineering at Truck Smarter, he spent years writing custom scrapers and web-form integrations for trucking companies. Every shipper in the US runs a different website. Kaizen is the productized version of that work.
Early numbers
Revenue is in the hundreds of thousands of dollars ARR. The team is two founders plus one employee, with a work trial scheduled. They have $500k in the bank and were close to a first term sheet as of Demo Day.