Trello's free tier allows up to 10 boards per workspace, unlimited cards, basic Power-Ups, 10MB file attachments, and 250 monthly automation runs. G2 reviewers frequently cite the 10-board cap and single Power-Up limitation as the primary drivers for upgrading. Trello's Standard plan at $5.00 per user per month unlocks unlimited boards, 250MB attachments, advanced checklists, card mirroring, and 1,000 automation runs. Trello's Premium tier at $10.00 adds AI features, Timeline, Calendar, Dashboard and Map views, unlimited automation, and admin controls. Trello's Enterprise plan includes SSO, unlimited workspaces, and organization-wide permissions. G2 users note that many useful integrations and Power-Ups require paid tiers.