Task / Group

Project Planner

A Gantt chart that saves to a single JSON file.

Getting started

1

Open an existing plan — click Open file to load a .json file from your computer.

2

Or start fresh — click + Add group in the task panel to create your first group, then add tasks inside it.

Building your plan

Groups organise related work. Each group gets its own colour and a rolled-up bar on the chart.
Tasks sit inside groups. Set a start date, end date, status, and optional progress %.
Subtasks break a task into smaller steps — each gets its own bar.

Working with the chart

Drag a bar left or right to move it. Drag the edges to resize.
Click any bar or row label to edit details.
Filter tasks using the search box at the top of the task panel.
Undo any change with the Undo button or Ctrl + Z.

Saving your work

Click Save or press Ctrl + S to write changes back to your .json file.
Export SVG snapshots the current view — opens in any browser, scales without losing quality, and all text remains fully selectable.

Your data stays on your machine — nothing is sent to any server.