Using Devin AI to Test the Coworker Desktop App on Windows

Melvin Vivas · X video post · 2026-09-18 · 0:15 · 355 views · Open on X

Topics: AI Dev Tools & Productivity, AI Agents, Tool Use & MCP, Evaluation (Evals) & Testing · Level: intermediate

Summary

This is a short demo post with no narration. Melvin Vivas shows the Devin AI coding agent testing his open-source desktop app, Coworker, on Windows. Devin records each test run so he can replay the recordings and check the results himself. Coworker is a desktop app where AI agents do work for you, and it supports both local and cloud models.

Key points

• Devin (@DevinAI) is an autonomous AI software engineering agent that can run QA tests on a desktop app, here on Windows.
• Devin saves recordings of its test sessions, so a person can replay them and confirm the agent's results instead of trusting it blindly.
• Coworker (github.com/donvito/coworker) is an open-source desktop app where AI agents do tasks for you.
• Coworker supports both local and cloud LLMs.
• Workflow pattern: hand cross-platform testing to an agent, then review the recorded evidence yourself.

Resources mentioned

• Coworker (donvito/coworker) · repo · github.com · free
  The creator's local-first desktop app where you pick an AI coworker and have it produce work such as invoices as finished PDFs.
  Also in: Claude Opus 5.5 for Video Making: Creator's Showcase Thread (Coworker) (Melvin Vivas on X · notes), Coworker: free open-source desktop AI coworker app (Melvin Vivas on X · notes), Coworker: Open-Source Desktop App for AI Agents (Melvin Vivas on X · notes), Intent Classification and Routing in a Multi-Agent Desktop App (Melvin Vivas on X · notes) and 38 more
• Devin · tool · x.com · paid
  A desktop app from the makers of the Devin coding agent for planning, delegating, reviewing and shipping work across fleets of local and cloud coding agents.
  Also in: Using the Devin iOS App to Build iOS Apps (Quick Demo) (Melvin Vivas on X · notes), Use Your ChatGPT Plus/Pro Subscription to Run Devin (Melvin Vivas on X · notes), OpenAI DevDay recap: Dots, GPT-6.1 Sol, Codex Cloud, Agents API (Melvin Vivas on X · notes), Devin price cuts and top score on FrontierCode 1.1 Extended (Melvin Vivas on X · notes) and 44 more

Try this

• Try having an AI agent such as Devin test your app, and review its test recordings to check the results.
• Look at the Coworker repo to see how a desktop AI agent app that supports local and cloud models is built.