Treader is described as 'Collaborative travel planner built around a real map. You drop places on it, drag them into days, and everyone on the trip edits the same plan at the same time. Cursors, comments, chat and a change log are built in, so nobody is copying a Google Doc into a group' and is a Travel Planner in the travel & location category. There are 2 alternatives to Treader, not only websites but also apps for a variety of platforms, including Android, iPhone, Android Tablet and iPad apps. The best Treader alternative is TripIt, which is free.
TripIt organizes your travel plans in one place. Simply forward confirmations to plans@tripit.com and we’ll do the rest. Access all your flights, hotels, car rentals, activities, maps and more on your WP7. Upgrade to TripIt Pro for peace of mind from check-in to baggage claim.
Write notes and map places you want to go on your trip in a single document with real-time collaboration. Export your itinerary to Google Maps for when you're on the go. And after the trip, easily turn your doc into a recommendations list for your friends.
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