Only Gantt

Only Gantt — Free Web-Based Gantt Chart for Project Management

Only Gantt is a free, browser-based Gantt chart application built exclusively for project scheduling. Plan tasks with WBS hierarchy, set dependencies, track milestones, manage resources, and export to PDF or Excel — all in your browser, no installation required. Projects are saved securely in the cloud. Available in Japanese and English.

Key Features

  • Interactive Gantt chart with drag-and-drop task bar scheduling
  • WBS (Work Breakdown Structure) hierarchical task management
  • Task dependencies: Finish-to-Start, Start-to-Start, Finish-to-Finish, Start-to-Finish
  • Milestones, baselines, and critical path visualization
  • Resource assignment with over-allocation detection
  • Custom holidays (public + company-specific) displayed on the timeline
  • Export to Excel, CSV, and PDF (full chart or selected rows)
  • Cloud storage with multiple project support (Google or email sign-in)
  • Undo/Redo, context menu, column filter, and sort
  • Bilingual UI: Japanese (日本語) and English

Frequently Asked Questions

Where is my data stored?
Projects are saved securely in the cloud (Google Firebase). Sign in to access your data from any browser or device. No data is stored locally in your browser or device.
Is it free?
Yes. Only Gantt is completely free to use.
Is account registration required?
Yes. You need an account to use Only Gantt. Sign up for free with your email and password, or use your Google account.
How is it different from Microsoft Project?
Works in any browser on any OS — no installation, no expensive license. Built-in Japanese and English support. Perfect for individuals and small teams who need full Gantt features for free.
How is it different from Asana / Jira / monday.com / Notion?
Only Gantt focuses entirely on scheduling: WBS, dependencies, baselines, critical path, resources, and holidays — all in the fewest clicks. Gantt is never buried behind issue boards or workflows.
Can I export to Excel or PDF?
Yes. Export to Excel, CSV, or PDF from the File menu. You can export the full chart or selected rows only.
Which browsers and devices are supported?
Latest versions of Chrome, Edge, Firefox, and Safari on desktop. No installation, plugins, or admin rights required. Also works on tablets (landscape orientation).
Can others see my projects?
Only you can access your projects. All data is protected by your account credentials. No third party — including the service operator — can access your project data.