Free includes:

• Task management & Kanban visualization
• Search for content & messages
• Mobile apps with offline support and nearby messaging
• Real time customer support
• Create up to 10 collaboration spaces
• Up to 250 MB of storage for documents and images
• Create up to 100 items (notes, links, issues, etc.)
• Up to 1000 of messages history per chat

All Free features plus:

• Unlimited storage
• Unlimited container item creation
• Unlimited message history per space
• Unlimited spaces creation

All Pro features plus:

• API Access
• On premises installation
• LDAP Integration
• Branded mobile apps
• Unlimited customizations
• Premium support