Proppo isn't a checklist of modules. It's the set of tools that run a property day to day. Explore by what you're trying to get done, not by feature name.
Property Management
Reservations, front office, availability
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Inventory & Distribution
Rooms, virtual inventory, channel manager
Revenue & Booking
Rate plans, direct booking engine, website builder
Guest Experience
Web check-in, guidebook, communication
Operations
Restaurant, housekeeping, vendors & procurement
Business & Admin
Finance, reports, roles, multi-property