How the Gantt chart works

Each Basecamp to-do becomes a bar on the timeline. Drag the middle of a bar to move it, or drag either edge to change its start or due date. Use the Day / Week / Month buttons to zoom the timeline and Today to jump to the current date.

Drag from the edge of one bar to another to create a dependency. Click an existing connection line to edit its type and lag, or to remove it. A dependency is stored on the successor—the task that depends on another.

• FS

  Finish → Start

  The successor starts after the predecessor finishes. The most common type, and the default for new connections.

• SS

  Start → Start

  The successor can't start until the predecessor starts. Useful for work that runs in parallel once kicked off.

• FF

  Finish → Finish

  The successor can't finish until the predecessor finishes. Use when two tasks must wrap up together.

• SF

  Start → Finish

  The successor can't finish until the predecessor starts. Rare—mostly for hand-offs between shifts or phases.

The chart schedules forward: when you move a task that others depend on, every downstream task shifts automatically to respect its dependency type and lag. The cascaded dates are saved for you—no need to drag each dependent task by hand.

Click Critical path in the toolbar to highlight the chain of tasks that determines your project's end date. If any task on the critical path slips, the whole project's finish date slips with it.

A milestone marks a key moment—a launch, a sign-off, a deadline—as a single diamond instead of a bar. Right-click any bar and choose Convert to milestone (right-click again to convert it back).

Each leaf task has a draggable progress handle—drag it along the bar to set completion from 0–100%. Progress is also shown as a column in the sidebar.

A baseline is a saved snapshot of your plan, drawn as a faint “ghost” bar behind each task so you can see how the current schedule has drifted from the original. Use the Baseline ▾ menu to:

• Show / Hide baseline—toggle the ghost bars on or off.
• Set baseline to current dates—capture today's schedule as the plan.
• Clear baseline—remove the saved plan.

Comparing planned vs. current for a task

1. Make sure the task has both a start and end date. Tasks without dates are skipped when a baseline is captured, so they get no ghost bar.
2. Open Baseline ▾ and choose Set baseline to current dates. This snapshots the current schedule of every dated task as the plan and turns the ghost bars on.
3. Reschedule the task—drag its bar, or let auto-scheduling shift it. The live bar moves while the ghost bar stays at the captured plan.
4. Read the gap between the live bar and the ghost beneath it: that offset is how far the task has drifted from plan.

• Columns (name, start, end, assignee, progress): click a header to sort, drag a border to resize, and use the column picker to show/hide. Your layout is remembered per project in this browser.
• Group tasks by list or by assignee.
• Filter by a single assignee, hide specific lists, or hide completed tasks.

Le Gantt keeps a clear line between Basecamp data and chart-only extras:

• Start & end dates are written back to the Basecamp to-do, so they stay in sync both ways.
• Dependencies, milestone flags, progress, and baselines are stored by Le Gantt only—Basecamp has no concept of them.
• Task titles, assignees, and completion always come from Basecamp.

Le Gantt starts with a 14-day free trial—no credit card required. After the trial, an active subscription is needed to keep using the charts.

• One subscription per Basecamp account. Billing is per organization, and every member of your Basecamp account is included—there's no per-seat charge.
• Admins manage billing. Only Basecamp admins can start, change, or cancel the subscription. Other members get full access while it's active but can't change billing.
• Billing contact. The admin who subscribes becomes the billing contact. Another admin can transfer the billing contact to themselves from the Subscription page.
• Payments & invoices are handled by our reseller, Lemon Squeezy, as Merchant of Record (so applicable taxes are included). Admins can open the billing portal to update payment details or download invoices.