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The Major Editor provides a collaborative environment to modify your applications and manage deployments.

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Live Editor

You can edit any application via a live editing session in the browser. Changes are reflected instantly in the preview pane.

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AI Assistance

The editor includes an AI assistant that has full context of your application code. You can ask it to:
  • Explain complex logic
  • Refactor components
  • Implement new features directly in the codebase

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Real-time Preview

Every editing session includes a live preview of the application’s latest version, allowing you to verify changes immediately before deploying.

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Version Control & Deployment

Major integrates with GitHub to version control your applications.

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Version History

You can view a complete history of your application’s versions. Each version is linked to a commit, ensuring full traceability of changes.

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One-Click Deploy

Deploying to production is instant. Navigate to the version you want to ship and click Deploy. The new version becomes available to all users with access immediately.

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Plan Mode

Plan Mode is a safety feature that lets you review AI-proposed changes before they’re applied to your code.

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How it works

When you start an AI session, it begins in Plan Mode:
  1. Exploration — The AI reads your files and analyzes your codebase (read-only)
  2. Plan creation — The AI summarizes its understanding and outlines proposed changes
  3. Review — You see the plan in the Plan tab on the right panel
  4. Decision — You choose to approve, reject, or provide feedback

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The Plan tab

When the AI creates a plan, it appears in the Plan tab alongside the Web, Code, and Logs tabs. The plan shows:
  • Summary of the proposed changes
  • Files that will be created or modified
  • Implementation approach

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Making a decision

After reviewing the plan, you have three options:
  • Approve — The AI proceeds with the implementation
  • Reject — The session stays in Plan Mode; no changes are made
  • Give Feedback — Tell the AI what to adjust, and it revises the plan

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After approval

Once you approve a plan:
  • The session switches to Accept Edits mode
  • The AI implements the changes
  • You see edits appear in real-time in the code panel
  • You can still request modifications as the AI works
Plan Mode ensures you always understand what changes will be made. Use it to catch misunderstandings before code is written.