Agent TARS
ByteDance's open-source multimodal AI agent that operates browsers and computers from a CLI, web UI or desktop app
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About Agent TARS
Agent TARS is an open-source AI agent stack from ByteDance that tries to finish tasks the way a person would, by looking at the screen and using a browser, the terminal and connected tools. It ships as a command-line tool with a web interface, installed through npm, and can run headless on a server. A hybrid browser agent controls pages through visual GUI recognition, the DOM or both, and the core is built on the Model Context Protocol, so you can attach MCP servers for extra tools. The same repository hosts UI-TARS Desktop, a native app for Windows and macOS that controls your local computer or a remote computer or browser with mouse and keyboard actions, driven by ByteDance's UI-TARS and Seed vision models. The software is free under the Apache 2.0 licence, but you supply a model: an API key for providers such as Volcengine or Anthropic, or your own UI-TARS deployment. It is aimed at developers and tinkerers rather than people wanting a polished consumer assistant.
Best for: Developers who want to experiment with open-source browser and computer-use agents on their own models.
Pros and cons
What works
- Free and open source under Apache 2.0
- Works with several model providers or a self-deployed UI-TARS model
- MCP support for plugging in extra tools
- Controls browsers by vision, DOM or a mix of both
Why people leave
- You pay for or host the model yourself
- CLI setup needs Node.js 22 or newer
- Two related projects in one repo can be confusing to start with
Top Agent TARS alternatives
See all 5- 1
ChatGPT69.5ChatGPT's agent mode browses and completes tasks in a hosted browser, with no setup or model keys.
- 2
Claude69.4Anthropic's assistant can use a browser and computer through its agent features, as a managed service.
- 3
Comet50.3An AI browser with a built-in assistant that acts on pages for you, ready to use out of the box.
- 4
goose50.0Open-source local agent with MCP extensions, better suited to developer and terminal workflows.
- 5
ChatGPT Atlas38.4OpenAI's browser with an agent that can click and fill forms in your own browsing session.
Why people left Agent TARS
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Agent TARS: common questions
Is Agent TARS free?
Yes. Agent TARS is free, open-source software that you can host yourself.
Is Agent TARS open source?
Yes. The source code is on GitHub at bytedance/UI-TARS-desktop. You can also run it on your own server.
What platforms does Agent TARS run on?
Agent TARS is available for macOS, Windows and Linux.
What are the best alternatives to Agent TARS?
The highest-ranked Agent TARS alternatives right now are ChatGPT, Claude and Comet. See the full ranked list for pricing, platforms and verified facts.