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1Code

Open-source UI for managing Claude Code agents.

Last updated: Feb 26, 2026

About 1Code

1Code by 21st is an open-source application that provides a cursor-like UI to run and manage Claude Code agents. The tool enables users to run agents in parallel on Mac and Web platforms, with local and remote sandbox options. It focuses on improving workflow by offering a visual interface for coding agents, facilitating easier management of AI-powered coding tasks.

Last updated: February 26, 2026

Who It's For

  • Developers working with AI coding agents.
  • Organizations deploying AI-powered development tools.
  • Tech-savvy users wanting custom AI orchestration solutions.

How It Works

  1. 1Users tag a project or workflow in GitHub, Linear, or Slack to start an agent.
  2. 2The tool orchestrates the execution of coding agents in parallel within a user-friendly interface.
  3. 3It supports local execution on Mac and remote execution in web-based sandboxes.
  4. 4Previews and mobile compatibility are available for testing and deployment.

How to Use 1Code

  1. 1Tag your relevant project or workflow in supported platforms.
  2. 2Launch the application for local or web-based use.
  3. 3Manage and monitor your coding agents through the cursor-like interface.
  4. 4Run agents in parallel and view live previews of your code execution.

Key Features

  • Open-source and customizable UI.
  • Parallel execution of multiple agents.
  • Supports local Mac and web sandbox environments.
  • Live previews and mobile compatibility.

Use Cases

  • Managing multiple AI coding agents simultaneously.
  • Running AI agents in local or web-based environments.
  • Streamlining AI-driven development workflows.
  • Monitoring and previewing AI agent outputs.

Pros & Cons

Advantages

  • Open-source offering with customizable UI.
  • Supports parallel execution of multiple agents.
  • Compatible with Mac and web platforms for flexibility.

Disadvantages

  • Requires some technical knowledge to set up and work with.
  • Limited detailed documentation in search results.
  • Focuses specifically on Claude Code, limiting broader AI integrations.

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Frequently Asked Questions

What is 1Code?

1Code by 21st is an open-source application that provides a cursor-like UI to run and manage Claude Code agents. The tool enables users to run agents in parallel on Mac and Web platforms, with local and remote sandbox options.

How much does 1Code cost?

1Code uses custom pricing — contact the vendor for a quote.

Is 1Code free?

1Code is a paid tool and does not offer a free plan.

What are the best 1Code alternatives?

Popular 1Code alternatives include GitHub Copilot, Replit, DeepCode.

What is 1Code used for?

1Code is commonly used for Managing multiple AI coding agents simultaneously., Running AI agents in local or web-based environments., Streamlining AI-driven development workflows..

Information Accuracy

Please note: While we regularly update all tool information including descriptions, features, pricing, and other details, this information may change over time as tools evolve and update their offerings. For the most current and accurate information, we recommend visiting the official website directly. Our goal is to provide you with comprehensive and up-to-date information to help you make informed decisions.