Trello

What it does

The original web kanban board: lists across the screen, cards you drag between them, and checklists, due dates and attachments inside each card. Its real advantage is that people who have never used a project tool understand it in about ten seconds, which is why it survives against far more capable software. The free plan allows unlimited cards but only ten boards per workspace, with attachments capped at 10 MB.

Best for

• A shared board nobody needs training for
• Tracking a small project

Where it stops