legacy-useOpen-source tool exposing legacy desktop apps via REST API so AI agents can control them via GUI automation.

4.8 (4)

Reviewed by Daniel Nikulshyn·Updated July 2026

Open Source REST API GUI Automation AI Agents Legacy Systems Integration Desktop Apps

Overview

legacy-use is an open-source tool that exposes legacy desktop applications via REST API, enabling AI agents to control them through GUI automation. It allows users to automate legacy applications, build reliable solutions, and integrate software silos. The tool works with any existing software and is suitable for various roles, including automation agencies, in-house developers, startups, software manufacturers, and software maintainers. legacy-use simplifies integration and automation across platforms, providing features such as API-driven services, observability, and UI testing. It helps users to automate processes that couldn't be automated before, eliminate human data transfer between systems, and quickly layer automation and AI products over legacy incumbents.

Key features

Exposes legacy desktop apps via REST APIs
Integrates AI with legacy systems
Turns formerly inaccessible systems accessible
Enables easy scripted automation
Improves efficiency and speed

Pricing

Model: Freemium
Category: AI Agent Development Frameworks
Rating: 4.8 / 5 (4)

Use cases

Modernize Legacy Desktop Software

Wrap aging desktop applications with a REST API so they can be accessed by modern systems without rewriting the underlying software.

Enable AI Agent Control of Legacy Apps

Allow AI agents to interact with legacy GUIs through automated clicks and inputs, enabling intelligent workflows on top of unsupported software.

Automate Repetitive Desktop Workflows

Use GUI automation to script and run repetitive tasks in legacy desktop tools, reducing manual effort for back-office operations.

Bridge Legacy Apps with Modern Integrations

Connect old desktop applications to modern web services, databases, or business systems by exposing their functionality through REST endpoints.

Pros & Cons

Pros

Control legacy applications with AI-driven automation.
Simplifies integration.
Access formerly inaccessible systems.
Fast integration and scripting.
Improves efficiency and speed.

Cons

May require technical expertise to set up and use
Dependence on GUI automation may lead to fragility
Potential security concerns with exposing legacy applications via API

Reviews

4.8

Average from 4 ratings.

Nadia Petrova

Feb 11, 2026

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on the integrations, and the value for money is strong caught me off guard. still, I'd recommend giving it a real trial.

Ethan Brooks

Jan 7, 2026

Use it every day

Honestly didn't expect to like it this much. The onboarding is exactly what I needed, and it is genuinely easy to set up. I do wish the docs could be deeper, but I reach for it almost every day now and it just clicks.

Margaret Whitfield

Jun 27, 2025

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on the automation, and the value for money is strong caught me off guard. The docs could be deeper is why this isn't a perfect score, still, I'd recommend giving it a real trial.

Ahmed Saleh

Jun 8, 2025

Compared a few options

Evaluated this against two competitors. Where it wins: the onboarding and it saves real time. Where it lags: pricing gets steep at scale. On balance the feature set — especially the core workflow — justifies the 5 stars for our use case.

Q&A

What does legacy-use actually do?

legacy-use is an open-source tool that exposes legacy desktop applications through a REST API, allowing AI agents to interact with and control those apps via GUI automation.

Is legacy-use free to use?

Yes, legacy-use is open-source, so it can be self-hosted and used without licensing fees. Operational costs depend on your own infrastructure and any AI agents you integrate with it.

What are typical use cases for legacy-use?

It's designed for automating or AI-enabling legacy desktop applications that lack modern APIs. By wrapping them in a REST interface, AI agents can drive their GUIs to perform tasks like data entry, workflow automation, or integration with newer systems.