Trello's Kanban-first design is the easiest PM tool to get a team actually using, no training required. Rated 5/5 for ease of use by the r/projectmanagement community.
This is the easiest tool here to get a team actually using, because it matches how people already think: 'to do / doing / review / done.' If adoption is your #1 constraint, Trello is hard to beat.
Trello is very Slack-friendly: create cards from Slack, preview links, and save Slack messages into Trello (including an Inbox flow). A client drops feedback in a Slack thread, you can turn that message into a card immediately.
Asana is the go-to for structured project execution with first-class dependencies, milestones, and approvals. It scales from small teams to enterprise without losing usability.
Teamwork is the top pick for agencies and consultants managing client projects, with built-in billing, invoicing, and proofing tools no competitor matches at this price. PCMag Editors' Choice for client-based work.
Zoho Projects packs Gantt charts, time tracking, automations, and an AI assistant into the most affordable full-featured PM tool on the market. Free plan available; premium starts at just $4/user/month.
Monday.com's visual spreadsheet-meets-board interface works for almost any team type, from marketing to operations. It's the most flexible general-purpose PM tool with strong cross-team visibility.