legacy-use – add REST APIs to legacy software with computer-use
Hello HN! Sebastian here from Schub. We just open-sourced a new project I've been working on, called legacy-use, and I’d love to get your thoughts. At Schub, we’ve been building agents that automate legacy Windows software (healthcare systems, finance tools, EHRs), the kind of stuff that’s mission-critical but hasn’t changed since Windows XP. These apps have zero APIs and usually require humans clicking around all day. So we built legacy-use, an agentic API layer for any desktop app. Well, technically any software. Legacy-use lets AI agents control GUI-based software by emulating mouse and…
legacy-use – add REST APIs to legacy software with computer-use launched on July 14, 2025 with 15 votes, #939 of 9,223 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Legacy-use is an open-source tool that adds REST API capabilities to legacy desktop software by enabling AI agents to control applications through GUI automation. It emulates mouse and keyboard input with visual feedback, designed for mission-critical systems like healthcare platforms, finance tools, and ERP software that lack modern APIs. The tool works across Windows, Linux, and other systems, extending Anthropic's Computer Use capabilities to automate repetitive manual tasks in older applications.
written from the facts on this page · September 2026
From the sources
Automate any legacy application with AI | legacy-use allows to expose legacy applications with REST-APIs, enabling you to build reliable solutions and automate workflows where it was not possible before
legacy-use is available now as Open Source. Check it out on Github! legacy-use is available now as Open Source. Check it out on Github! Often disconnected, legacy systems hold the data that’s most valuable to AI-driven automation. Our vision is to change that. We expose legacy software through REST-API interfaces, making it accessible to agents and modern automation tools. This way, any system can be integrated, and every company can benefit. Brands belong to their respective rights holders. No official partnership. legacy-use simplifies the work of building and maintaining integrations across platforms. Turn manual legacy software processes into stable API-driven services. Use prompts to…from legacy-use.com
In the maker’s words, at launch
Hello HN! Sebastian here from Schub. We just open-sourced a new project I've been working on, called legacy-use, and I’d love to get your thoughts. At Schub, we’ve been building agents that automate legacy Windows software (healthcare systems, finance tools, EHRs), the kind of stuff that’s mission-critical but hasn’t…
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