Trello offers Free Trial, but User.com does not.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
User.com is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Trello begins at $5/User/Month when Billed Yearly, while pricing details for User.com are unavailable.
Some top alternatives to Trello includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Freshbooks, Jira, Basecamp, Wrike, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, Resource Guru and Height.
Some top alternatives to User.com includes Outgrow, ActiveCampaign, CleverTap, Moosend, Omnisend, SALESmanago, LeadBI, Marketing Optimizer, GoCRM, SimpleCRM, LeadMaster, DigitalCRM.com, Oracle CX Marketing, Zoho Marketing Automation and Ackwire.