Coasty (YC S26) Launches API to Automate Legacy Software Without Traditional Integrations

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Y Combinator-backed startup Coasty, founded by Nitish and Prateek, has launched an API that enables computer-use agents to automate workflows inside legacy desktop software and web applications that lack usable APIs. Developers submit natural-language tasks along with credentials and files, and the agent navigates interfaces using screenshots, mouse, and keyboard input before returning a structured run record. Unlike traditional RPA tools that record and replay fixed click sequences, Coasty's agents observe screen state at each step, allowing them to recover from unexpected pop-ups, slow page loads, or interface changes. The platform targets use cases such as healthcare prior authorizations, accounting data entry, and cross-system data transfers, where building conventional integrations can take months. Each task runs in an isolated virtual machine, with support for human approval checkpoints, custom data-validation rules, and full audit trails.

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