Coworker: Free Desktop AI Agent App with Cloud or Local Models

Melvin Vivas · X post · 2026-09-10 · Open on X

Topics: AI Agents, Tool Use & MCP, AI Dev Tools & Productivity, AI Safety, Security & Guardrails · Level: beginner

Summary

Melvin Vivas shows Coworker, his open-source desktop app where AI agents do work for you, such as making an invoice. In the demo it runs on the free Nemotron-3.5 Lightning model through OpenRouter. It also works with local models through Ollama or LM Studio, so your data stays on your computer.

Key points

• Coworker is a free, open-source desktop app where AI agents do tasks for you, such as making invoices.
• The demo uses the free Nemotron-3.5 Lightning model through OpenRouter.
• It supports local models through Ollama and LM Studio if you don't want data to leave your machine.
• The same agent app can switch between cloud and local model providers.

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), Using Devin AI to Test the Coworker Desktop App on Windows (Melvin Vivas on X · notes) and 38 more
• NVIDIA Nemotron 3.5 · tool · openrouter.ai · free
  NVIDIA Nemotron model with thinking support, available free on OpenRouter.
  Also in: Free Nemotron 3.5 Lightning on OpenRouter Supports Thinking (Melvin Vivas on X · notes), Using Free OpenRouter Models (Nemotron 3.5) With Coworker (Melvin Vivas on X · notes)
• OpenRouter · tool · openrouter.ai · free
  A single OpenAI-compatible API that routes requests to hundreds of models from many providers, with one bill and model fallbacks.
  Also in: Customizing Your Coding Setup with Pi Coding Agent Extensions (Melvin Vivas on X · notes), The Jev model is now on OpenRouter (Melvin Vivas on X · notes), Kev-4B model, an alternative to Jev, now available on OpenRouter (Melvin Vivas on X · notes), Space Bunny Alpha: stealth 1M-context flash model on OpenRouter (Melvin Vivas on X · notes) and 42 more
• Ollama (@ollama on X) · tool · x.com · free
  A tool for running open LLMs locally on your own machine.
• LM Studio · tool · x.com · free
  Desktop app for downloading and running LLMs locally, with a developer mode that serves models through an API.
  Also in: Running LLMs Locally Without an Expensive Rig (Melvin Vivas on X · notes), Adding Vercel AI Gateway as a provider in AIBackends with Devin (Melvin Vivas on X · notes), LoRA Fine-Tune Qwen3.5-2B on Your Tweets with Unsloth Studio (Melvin Vivas on X · notes), AIBackends: An API Layer Between Your App and AI Models (Now with Jev) (Melvin Vivas on X · notes) and 31 more

Try this

• Try Coworker with the free Nemotron model on OpenRouter, or with a local model through Ollama or LM Studio.
• Build a desktop agent app that can switch between cloud (OpenRouter) and local (Ollama/LM Studio) model backends.